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MS 1979 (2007) (English): ELECTRICAL
INSTALLATIONS OF BUILDINGS - CODE OF PRACTICE
MALAYSIAN
STANDARD
MS
MS 1979:2007
1979:2007
ELECTRICAL INSTALLATIONS OF
BUILDINGS - CODE OF PRACTICE
ICS:
91.140.50,29.020
ICS: 91.140.50,29.020
Descriptors
practices ,, electrical
electrical installations
installations,, buildings,
buildings , residential
residential houses,
Des
criptors :: pr2ctices
houses , dwellings
dwellings
©
Copyright 2007
2007
© Copyright
DEPARTMENT OF
OF STANDARDS
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MS1979:2007
1979:2007
MS
CONTENTS
CONTENTS
Page
Page
Committee representation """" ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, """,,,,,,
"""""" , ,,",""""
Committee representation
............... "...................................................................
iviv
Forewo
,,,,,,,,,, ,,,,,,,,,, """",,, ,,, .. ,,,,,,,,,,,,,,,,,,, "."",,,., ""'"''''' ''''' """"""
Forewordrd""""",
...............................................................................................................
''''
vv
Introduction ,,,,. ,,,,,,,,, ,.. """'" ..... ","'". "'"''''''' ''''''''''' '' " ..... " .. ,,,
... ,,,, .... "."." ... ,,,,,
Introduction .........................................................................................................
.
1
Scope .... ,,, ..... ," ... ,, ... ".".,.,." ... " ". " .. "."."" " ........... "', ... " ... ,....
", ...... " .. "" .... ,, .. ,"
Scope ...................................................................................................................
1
2
2
Normative references ."."""" ."""." ... "".".,,', , .... ,................. ,.,,
... ,..... ,.... " .. "." ...."
Normative references
.........................................................................................
1
3
3
Require ments ,,,, .. ,, .. ', ............ ,... ,, .......................... ,...... ,, .... ,,,' ..
" ....... " .... ".",,, .. ,,..
Requirements ......................................................................................................
22
4
4
Issues addressed
Issues addressed
4.1
General characteristics of electricity supply
General characteristics
of electricity supply
COP ai, Characteristics of public electricity supply "" ............
" ... " ...... "" .............
COP 01, Characteristics of public electricity supply ..........................................
COP 02, Suitability for use ............. "."" .. " .... " .... """" .... """" ..
" .. "".".",, ..... ,,",,..
COP 02, Suitability
for use ...................................................................................
COP 03, Application for supply of electric ity" .. """""" .... """""
....... ""." .. "" ... ""
COP 03,
Application for supply of electricity .......................................................
..
22
22
22
4.2
4.2
4,2.1
4.2.1
4.2.2
Protection against electric shock
Protection against electric
shock
COP 04, Protection against direct contact ............... ,................
, .. ,.. ,.. " .. ,,, ........ ,"..
COP 04, Protection against direct contact .........................................................
COP 05, Earthing of equipment ......... " .............. " .... " .. " ......... "
......... " ... " .. "" ... ..
COP 05, Earthing of equipment .........................................................................
COP 06, Isolation on fault .......... " ............ ""."" ........ "" .. "." ... "
....... "." .. ", .. ".,""...
COP 06, Isolation on fault ................ " .................................................................
COP 07, Require ment of earthing system ... """ ....... " ....... """"
......... "."" ..... "."...
COP 07, Requirement of earthing system ..........................................................
2
3
3
3
4.3
4.3
4.3.1
4.3.1
4.3.2
4.3.2
4.3,3
4.3.3
Protection against thermal effects
Protection against thermal effects
COP 08, Protection again fire"." """." .... "'''".,,' '''''''''''' '', ..... ,,'',
COP 08, Protection again fire .............................................................................
...... ,,'',, ....... ,,''''..
COP 09, Protection by placing out of reach" " ......... "" ...... "" .. ""
........ "." .... "",, ...
COP 09, Protection by placing out of reach .........................................................
COP 10, Protection against overheating "." .. "".""" .. "" ......... ""
..... "." .. ",, ........ ..
COP 10, Protection against overheating .............................................................
3
33
44
4.4
4.4
4.4,1
4.4.1
4.4.2
4.4.2
4.4.3
4.4.3
4.4.4
4.4.4
4.4.5
4.4.5
4.4.6
4.4.6
4.4.7
4.4.7
Overcurrent protection
Overcurrent protection
COP ii, Overcu rrent protection of phase conduc tors."" ........
"."'" .. " ... "",, ..... ,,..
COP 11, Overcurrent protection of phase conductors .........................................
COP 12, Cross section area of neutral conductors "" .. " ... "" .. "."
.. "",",, ....... ,,""..
COP 12, Cross section area of neutral conductors ............................................
COP 13, Nominal current of protection devices ......... " .... " ...... "
... "." ....... ,,""'''''' .
COP 13, Nominal current of protection devices ...................................................
COP 14, Curren t carrying capacity of cable .. """ .......... ,,,.,,.,, ........
,,.,, ........... ,, .. ,,..
COP 14, Current carrying capacity of cable .......................................................
COP is, Curren t to ensure effective operation of protective device
,................ ..
COP 15, Current to ensure effective operation of protective device.....................
COP 16, Determination of short circuit curren!.. ........ " ............
" ... ""."" ... " .. " .... " .
COP 16, Determination of short circuit current... .................................................
COP 17, Rating of short circuit protective device " .... ,,, ............
,,,,.,, ............. ,, .. "" .
COP 17, Rating of short circuit protective device ................................................
44
44
44
44
44
55
55
4.5
4.5
4.5.1
4.5.1
4.5.2
4.5.2
Protection against voltage disturbance
Protection against voltage disturbance
COP 18, Commo n earthing system ","" .. ,""." ........ " ..... ' .........
" .................. "" .. .. .
COP 18, Common earthing system .....................................................................
COP 19, Installation of SPD"" """." ... " ... """" .. " ... ".,,,.,,"' ,, .. ,,,
.. ,,",, ... ,,,, ... , .. ,, ... . .
COP 19, Installation of SPD .................................................................................
55
55
4.6
4.6
4.6.1
4.6.1
4.6.2
4.6.2
4.6.3
4.6.3
4.6.4
4.6.4
Wiring system s
Wiring systems
COP 20, Prevention of eddy current ...." ...... "" .........................
"" .. "".".". "" .. "". ..
COP 20, Prevention of eddy current... ................................................................
COP 21, Separation of HV and LV cables .".""." .. " .. "" .. ".""."
...... ,,, .... ,, ... ,, .. ,, .. ,..
COP 21, Separation of HV and LV cables ..........................................................
COP 22, Installation of three phase and single phase circuits
.... " .... " ... "" ..... " ..
COP 22, Installation of three phase and single phase circuits " ..........................
COP 23, Connection of dissimilar metals ..... "" .... " .. """ .... " ...
"., .. "" ... "."",, .. ,, .. , .
COP 23, Connection of dissimilar metals ............................................................
66
66
66
66
oa
4.1
4.1.1
4.1.1
4.1.2
4.1.2
4.1.3
4.1.3
4.2.2
4,2.3
4.2.3
4,2.4
4.2.4
© STANDARDS MALAYSIA 2007 - All rights reserved
© STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007
1979:2007
MS
CONTENTS (continued)
(continued)
CONTENTS
Page
Page
4.6.18
4.6.18
4.6.19
4.6.19
4.6.20
4.6.20
4.6.21
4.6.21
4.6.22
4.6.22
COP 24, Installation of conductors in buried cable ducts ................................... ..
COP 24, Installation of conductors in buried cable ducts ................................... ..
COP
25, Bending radius of cables ...................................................................... ..
COP 25, Bending radius of cables ....................................................................... .
COP 26, Support for vertical cables .................................................................... .
COP 26, Support for vertical cables .................................................................... .
COP 27, Space factor ...........................................................................................
COP 27, Space factor ...........................................................................................
COP 28, Cables installed behind walls ............................................................... ..
COP 28, Cables installed behind walls ............................................................... ..
COP 29,
29, Mechanical
Mechanical protection
protection for
for cables
cables within
within walls
walls .......................................
...................................... ...
COP
COP 30, Cables installed within ceiling space ..................................................... .
COP 30, Cables installed within ceiling space .................................................... ..
COP 31, Water heater circuits ............................................................................ ..
COP 31, Water heater circuits ............................................................................ ..
COP
32, Air conditioner circuits .......................................................................... ..
COP 32, Air conditioner circuits .......................................................................... ..
COP
33, Group
Group reduction
reduction factors
factors .......................................................................
...........................................................................
COP 33,
COP 34, Consideration for loaded conductors .................................................... .
COP 34, Consideration for loaded conductors ................................................... ..
COP 35,
35, Size
Size of
of neutral
neutral conductor
conductor ......................................................................
..................................................................... ...
COP
COP 36, Neutral conductor reduction at the discretion of Professional
COP 36, Neutral conductor reduction at the discretion of Professional
Design Electrical Engineer. .................................................................................. .
Design Electrical Engineer. ...................................................................................
COP
37, Phase conductors connected in parallel .............................................. ..
COP 37, Phase conductors connected in parallel .............................................. ..
COP 38, Cables suitable for the most onerous condition ................................... ..
COP 38, Cables suitable for the most onerous condition ................................... ..
COP 39,
39, Minimum
Minimum size
size of
of wiring
wiring conductors
conductors .......................................................
...................................................... ...
COP
COP
40,
Neutral
conductor
for
every
circuit
........................................................
.
COP 40, Neutral conductor for every circuit.. ...................................................... .
COP 41, Allowable voltage drop .......................................................................... .
COP 41, Allowable voltage drop ......................................................................... ..
4.7
4.7
4.7.1
4.7.1
4.7.2
4.7.2
4.7.3
4.7.3
4.7.4
4.7.4
Electrical connections
connections
Electrical
COP
42,
Soldered
connections .......................................................................... ..
COP 42, Soldered connections ............................................................................
COP
43,
Use
of
sockets
and crimps
crimps for
for connections
connections .........................................
.............................................
COP 43, Use of sockets and
COP
44,
Cables
for
final
sub-circuits
..................................................................
COP 44, Cables for final sub-circuits ......................................................................
COP 45,
45, Sealing
Sealing of
of partitions
partitions ..............................................................................
................................................................................
COP
4.8
4.8
4.8.1
4.8.1
4.8.2
4.8.2
4.8.3
4.8.3
4.8.4
4.8.4
4.8.5
4.8.5
4.8.6
4.8.6
4.8.7
4.8.7
4.8.8
4.8.8
4.8.9
4.8.9
4.8.10
4.8.10
4.8.11
4.8.11
4.8.12
4.8.12
4.8.13
4.8.13
Switching and
and control
control
Switching
COP 46,
46, Multi-pole
Multi-pole switching
switching devices
devices ................................................................
....................................................................
COP
COP
47,
No
MCB
or
fuse
in
a
neutral
conductor
............................................... ...
COP 47, No MCB or fuse in a neutral conductor ................................................
COP
48,
Operation
of
RCD
.................................................................................
COP 48, Operation of RCD ................................................................................. ....
COP 49,
49, Protective
Protective conductor
conductor of
of aa circuit...
circuit ............................................................
COP
........................................................ ...
COP 50,
50, Current
Current operated
operated RCD
RCD ........................................................................
............................................................................
COP
COP 51,
51, RCD
RCD for
for single
single phase
phase circuit
circuit ................................................................
..................................................................
COP
COP
52,
RCD
for
three
phase
circuit
.................................................................
COP 52, RCD for three phase circuit .....................................................................
COP 53,
53, RCD
RCD for
for hand
hand held
held equipment
equipment ............................................................
................................................................
COP
COP
54,
ReD
for
special
places
.......................................................................
COP 54, ReD for special places ....................................................................... ....
COP 55,
55, Location
Location of
of RCD
RCD ..................................................................................
......................................................................................
COP
COP
56,
Regular
testing
of
RCD ......................................................................
..........................................................................
COP 56, Regular testing of RCD
COP
57,
Selection
of
short
circuit
protective
device...........................................
...............................................
COP 57, Selection of short circuit protective device
COP
58,
Requirement
for
devices
for
emergency
switching
............................. ...
COP 58, Requirement for devices for emergency switching ..............................
4.9
4.9
4.9.1
4.9.1
4.9.2
4.9.2
4.9.3
4.9.3
4.9.4
4.9.4
Surge protective
protective devices
devices
Surge
COP
59,
Installation
of SPD
SPD ................................................................................
....................................................................................
COP 59, Installation of
COP 60,
60, Use
Use of
of SPD
SPD ..........................................................................................
..............................................................................................
COP
COP 61,
61, Rating
Rating of
of SPD
SPD .......................................................................................
.........................................................................................
COP
COP
62,
Protection
of
electronic
devices by
by SPD
SPD ..............................................
..................................................
COP 62, Protection of electronic devices
COP
63,
Installation
of
SPD
in
special
environments
......................................... ...
COP 63, Installation of SPD in special environments ..........................................
COP 64,
64, Earth
Earth connection
connection of
of SPD
SPD ......................................................................
..........................................................................
COP
4.6.5
4.6.5
4.6.6
4.6.6
4.6.7
4.6.7
4.6.8
4.6.8
4.6.9
4.6.9
4.6.10
4.6.10
4.6.11
4.6.11
4.6.12
4.6.12
4.6.13
4.6.13
4.6.14
4.6.14
4.6.15
4.6.15
4.6.16
4.6.16
4.6.17
4.6.17
4.9.5
4.9.5
4.9.6
4.9.6
ii
66
66
66
66
7
7
77
77
77
77
77
7
7
88
88
88
88
88
88
88
88
88
99
99
99
99
99
99
99
99
99
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
11
© STANDARDS MALAYSIA 2007 - All rights reserved
© STANDARDS MALAYSIA 2007· All rights reserved
1979:2007
MS 1979:2007
CONTENTS (continued)
Page
Page
4.10
4.10.1
4.10.2
4.10.3
4.10.4
Isolation
COP 65,
COP 66,
COP 67,
COP 68,
Requirement for circuit isolation ............................................................ .
Marking of isolation devices ................................................................ ....
Prohibition on the use of semiconductor devices for isolation ............. .
Prevention of unintentional re-energising ........................................... ..
11
11
11
11
11
11
11
11
4.11
4.11.1
4.11.2
4.11.3
4.11.4
4.11.5
4.11.6
4.11.7
4.11.8
Earthing
COP 69,
COP 70,
COP 71,
cap
COP 72,
COP 73,
cop
COP 74,
COP 75,
COP 76,
Uses of earthing system ..................................................................... ..
Earth electrodes ................................................................................... .
Restrictions on the use of water or gas pipes for earthing ................... .
Maintenance of earthing system .......................................................... ..
Minimum size of earthing conductors ..................................................
................................................. ...
Methods of connecting earthing conductors
conductors ........................................
....................................... ...
Selection of protective conductors ....................................................... .
Size of protective conductors .............................................................. ..
11
11
11
11
12
12
12
12
12
12
12
12
12
12
4.12
Protective bonding conductor
4.12.1 COP 77, Size of protective bonding conductors ..................................................
......................... ............ .............
12
12
12
12
4.13
4.13.1
Change-over switch of a standby generating set
COP 78, Prevention of parallel operation of standby
standby system with the public
supply....................................................................................................................
supply ....................................................................................................................
.................
4.13.2 COP 79, Separate neutral for the standby system ...............................
............................................
4.13.3 COP 80, Overcurrent protection for essential services
................... ..........
services ...........
......................................
13
13
13
13
13
13
4.14
4.14.1
4.14.2
4.14.3
4.14.4
4.14.5
4.14.6
4.14.7
4.14.8
4.14.9
4.14.10
4.14.11
13
13
13
13
13
13
13
13
13
14
14
14
14
14
14
14
14
14
14
14
14
Initial verification of installations
COP 81, Initial inspection of installation ..............................................................
COP 82, Supervision of work on LV single phase installations............................
installations ....... .....................
COP 83, Supervision of work on LV three phase installations ............................
............... ....... ......
COP 84, Testing of work on LV single phase installations ........................
.... ............ ........ ..........
COP 85, Testing of work on LV three phase installations ...................................
COP 86, Testing by Electrical Services Engineer ...............................................
COP 87, Condition precedent for receipt of electricity..
.............................
..........
electricity.................
........................
COP 88, Insulation tests on LV installations ........................................................
COP 89, Circuit checks ........................................................................................
COP 90, Requirement for labelling ......................................................................
COP
91, As-built diagrams ..................................................................................
COP91,
© STANDARDS MALAYSIA 2007 - All rights reserved
iii
MS 1919:2001
1979:2007
MS
Committee representation
representation
Committee
The Electrotechnical-1 Industry Standards Committee (ISC E-1) under whose authority this Malaysian Standard was
The Electrotechnical-1 Industry Standards Committee (lSC E-1) under whose authority this Malaysian Standard was
developed, comprises representatives from the following organisations:
developed, comprises representatives from the following organisations:
Association of Consulting Engineers Malaysia
Association of Consulting Engineers Malaysia
Department of Standards Malaysia
Department of Standards Malaysia
Federation of Malaysian Manufacturers
Federation of Malaysian Manufacturers
Independent Power Producer
Independent Power Producer
Jabatan Kerja Raya Malaysia
Jabatan Kerja Raya Malaysia
Kementerian Perdagangan Dalam Negeri dan Hal Ehwal Pengguna
Kementerian Perdagangan Dalam Negeri dan Hal Ehwal Pengguna
Malaysian Cable Manufacturers Association
Malaysian Cable Manufacturers Association
Malaysian Electrical Appliances and Distributors Association
Malaysian Electrical Appliances and Distributors Association
Ministry of International Trade and Industry
Ministry of International Trade and Industry
Persatuan Pengguna-Pengguna Standard Malaysia
Persatuan Pengguna-Pengguna Standard Malaysia
Pusat Tenaga Malaysia
Pusat Tenaga Malaysia
SIRIM QAS International Sdn Bhd (Electrotechnical Testing Section)
SIRIM QAS International Sdn Bhd (Electrotechnical Testing Section)
SIRIM QAS International Sdn Bhd (Product Certification Section)
SIRIM QAS International Sdn Bhd (Product Certification Section)
Suruhanjaya Komunikasi dan Multimedia Malaysia
Suruhanjaya Komunikasi dan Multimedia Malaysia
Suruhanjaya Tenaga
Suruhanjaya Tenaga
Tenaga Nasional Berhad
Tenaga Nasional Berhad
The Electrical and Electronics Association of Malaysia
The Electrical and Electronics Association of Malaysia
The Institution of Engineers, Malaysia
The Institution of Engineers, Malaysia
Universiti Teknologi Malaysia
Universiti Teknologi Malaysia
The Technical Committee on Electrical Installation, Protection and Insulation Practice which developed this
The Technical Committee on Electrical Installation, Protection and Insulation Practice which developed this
Malaysian Standard was managed by The Electrical and Electronics Association of Malaysia (TEEAM) in its capacity
Malaysian Standard was managed by The Electrical and Electronics Association of Malaysia (TEEAM) in Its capacity
as an authorised Standards-Writing Organisation and consists of representatives from the following organisations:
as an authorised Standards-Writing Organisation and consists of representatives from the following organisations:
Association of Consulting Engineers Malaysia
Association of Consulting Engineers Malaysia
EITA Holdings
Holdings Sdn
Sdn Bhd
Bhd
EITA
G.H. Liew Engineering (1990) Sdn Bhd
G.H. Liew Engineering (1990) Sdn Bhd
Jabatan Bomba dan Penyelamat Malaysia
Jabatan Bomba dan Penyelamat Malaysia
Jabatan Kerja
Kerja Rays
Raya Malaysia
Malaysia
Jabatan
Sabah Electricity
Electricity Sdn
Sdn Bhd
Bhd
Sabah
Sarawak Electricity
Electricity Supply
Supply Corporation
Corporation
Sarawak
SIRIM QAS
QAS International
International Sdn
Sdn Bhd
Bhd (Electrotechnical
(Electrotechnical Testing
Testing Section)
Section)
SIRIM
Suruhanjaya Tenaga
Tenaga
Suruhanjaya
The Electrical
Electrical and
and Electronics
Electronics Association
Association of
of Malaysia
Malaysia (Secretariat)
(Secretariat)
The
The Institution
Institution of
of Engineers,
Engineers, Malaysia
Malaysia
The
Time Era
Era Sdn
Sdn Bhd
Bhd
Time
TNB Distribution
Distribution Division
Division
TNB
Universiti Malaya
Malaya
Universiti
Universiti Teknologi
Teknologi Malaysia
Malaysia
Universiti
iv
iv
© STANDARDS
STANDARDS MALAYSIA
MALAYSIA 2007
2007 - All
All rights
rights reserved
reserved
©
MS 1979:2007
FOREWORD
This Malaysian Standard was developed by the Technical Committee on Electrical
Installation, Protection and Insulation Practice under the authority of the Electrotechnical
Industry Standards Committee. Development of this standard was carried out by The
Electrical and Electronics Association of Malaysia which is the Standards-Writing
Organisation (SWO) appointed by SIRIM Berhad to develop standards for electrical
installation, protection and insulation practice.
This Standard is the result of the combined effort of TEEAM SWO operating as the Working
Group and as the Chair of SIRIM's Technical Committee No. 10 (TC 10): Electrical
of the
the
Installation, Protection and Insulation, overseeing the various stages of development of
COP.
More than 80 % of Malaysian electricity customers are domestic and residential installations
electricity
catering to uninformed consumers. On the other hand, less than 20 % of Malaysian electricity
as
whilst MS IEC 60364 as
customers are either commercial or industrial consumers. Therefore, whilst
for both the
the
a set of standards provides guidelines for the broad spectrum of LV installations, for
the direction of
informed as well as the uninformed consumers, this standard developed under the
the regulatory body, however, deals with the safety of (uninformed) consumers.
by electrical safety
safety
This standard provides for the relevant requirement as prescribed by
consideration for consumers' protection of relevant technical considerations of the practices.
© STANDARDS MALAYSIA 2007 - All rights res6IVed
reserved
v
MS 1979:2007
1979:2007
MS
ELECTRICAL INSTALLATIONS
INSTALLATIONS OF
OF BUILDINGS
BUILDINGS -- CODE
CODE OF
OF PRACTICE
PRACTICE
ELECTRICAL
O.
O.
Introduction
Introduction
This Malaysian
Malaysian Standard
Standard has
has been
been developed
developed based
based on
on the
the source
source material
material as
as contained
contained in
in
This
the guide
guide to
to MS
MS lEG
lEG 60364
60364 on
on electrical
electrical installations
installations of
of buildings.
buildings.
the
In
stating the
the safety
safety requirements
requirements for
for (uninformed)
(uninformed) consumers,
consumers, this
this standard
standard articulates
articulates the
the
In stating
practices relating
relating to
to electrical
electrical installations
installations of
of buildings
buildings for
for residential
residential houses
houses and
and dwellings.
dwellings.
practices
Furthermore, this
this standard
standard also
also addresses
addresses certain
certain instances
instances where
where and
and when
when other
other forms
forms of
of
Furthermore,
low voltage
voltage (LV)
(LV) electrical
electrical installations
installations have
have impact
impact upon
upon the
the safety
safety requirements
requirements for
for
low
uninformed persons;
persons; as
as long
long as
as the
the LV
LV public
public electricity
electricity supply
supply is
is of
of the
the TT
TT system
system and
and the
the
uninformed
installation is
is not
not in
in contradiction
contradiction to
to the
the dictates
dictates of
of the
the professional
professional design
design electrical
electrical engineer.
engineer.
installation
of code
code of
of practices
practices constitute
constitute this
this standard
standard with
with each
each practice
practice having
having its
its
Ninety one
one numbers
numbers of
Ninety
own
discreet
reference
number.
The
chronological
appearance
of
the
listing
of
practices
own discreet reference number. The chronological appearance of the listing of practices
generally follows
follows the
the flow
flow of
of the
the fourteen
fourteen issues
issues as
as addressed
addressed in
in the
the guide
guide of
of MS
MS lEG
lEG 60364
60364
generally
on electrical
electrical installations
installations of
of buildings.
buildings.
on
Each code
code of
of practice
practice is
is a
a concise
concise statement
statement of
of the
the relevant
relevant requirement
requirement as
as prescribed
prescribed by
by
Each
as is
is the
the Malaysian
Malaysian industrial
industrial norm
norm
electrical safety
safety consideration
consideration for
for consumers'
consumers' protection;
protection; as
electrical
and per
per the
the law.
law.
and
1.
Scope
in
This Malaysian Standard has been developed based on the source material as contained in
the guide
guide to
to MS
MS lEG
lEG 60364
60364 on
on electrical
electrical installations
installations of
of buildings.
buildings.
the
This Malaysian Standard provides the requirement for LV electrical installations of buildings
such as
as residential
residential houses
houses and
and dwellings,
dwellings, and
and in
in certain
certain circumstances,
circumstances, where
where and
and when
when
such
similarities exist,
exist, to
to those
those in
in commercial
commercial and
and industrial
industrial installations.
installations.
similarities
For electrical installations, other than those for residential houses and dwellings where the
deSign
of the
the electrical
electrical installations
installations will
will be
be carried
carried out
out by
by professional
professional design
design electrical
electrical
design of
and applicable
applicable sections
sections in
in MS
MS lEG
lEG 60364
60364 will
will
engineers for
for informed
informed consumers,
consumers, the
the relevant
relevant and
engineers
prevail in accordance to professional judgment.
2.
Normative references
The following normative references are indispensable for the application of this standard. For
dated references, only the edition cited applied. For undated references, the latest edition of
of
the normative reference (including any amendments) applies.
Guide to MS lEG 60364 on Electrical Installations of Buildings
Electricity Supply Act 1990 - Act 447
Electricity Regulations 1994
© STANDARDS
STANDARDS MALAYSIA
MALAYSIA 2007
2007 - All
rights reserved
reserved
©
All rights
007
MS
MS1979:2
1979:2007
3.3.
ireme nts
Requ
Requirements
standard conform to those as prescribed in the
ed inin this
ments as
The
The require
requirements
as develop
developed
this standard conform tions
to those
prescribed
in the
s
those section
1994,asand
the Electricity Regula
ity Supply
Electric
Electricity
SupplyAct
Act1990
1990- -Act
Act447
447and
and the Electricity Regulations
1994,
and
those
sections
60364.
lEG
MS
in
d
specifie
s as
ian practice
and
andparts
partssuitable
suitablefor
forMalays
Malaysian
practices
as specified in MS IEC 60364.
4.
4.
ssed
s addre
Issue
Issues
addressed
4.1
4.1
ity supply
teristic s of
l charac
Genera
General
characteristics
ofelectric
electricity supply
tions for residential buildings and dwellings receive the
al installa
ian electric
Almost
Almost all
all Malays
Malaysian
electrical
installations
for residential buildings and dwellings receive the
ity supply
LV
LV supply
supply from
from the
the electric
electricity
supply body.
body.
electric ity supply
teristic s of
COP
COP 01,
01, Charac
Characteristics
of public
public electricity supply
4.1.1
4.1.1
g characteristics:
ity supply
The
The public
public electric
electricity
supply has
has the
the followin
following characteristics:
Voltage
Voltage::
240
240 Va.c.
Va.c. for
for single
single phase
phase system
system
phase
three
for
a.c.
V
415
415 V a.c. for three phase 4-wire
4-wire system
system
n is
Variatio
Variation
is +
+ 55 %
% and
and -- 10
10 %
%
Frequency:
Frequency:
1%
±1
50 Hz
50
Hz ±
%
to establish his own earth)
has to
user has
(the user
-system (the
TT-system
system: TT
Wiring system:
establish his own earth)
4.1.2
use
for use
Suitab ility for
02, Suitability
COP 02,
COP
suitable for use under the conditions as stated in
be suitable
shall be
selected shall
equipment selected
electrical equipment
All electrical
All
for use under the conditions as stated in
(see4.1 .1).
COP01 (see4.1.1).
COP01
4.1.3
4.1.3
electric ity
of electricity
supply of
for supply
Applic ation for
03, Application
COP 03,
COP
24 of the Electricity Supply Act 1990 as well as
Section 24
under Section
requirement under
the requirement
to the
Pursuant to
Pursuant
of the Electricity Supply
Act 1990 as well as
requiring a supply of electricity shall make an
person requiring
licensee, aa person
the licensee,
of the
guidelines of
other guidelines
any other
any
a supply ofpremise
electricity
shall make
ity
electrican
s where
the location of the
stating the
licensee, stating
respective licensee,
the respective
to the
application to
application
location of the premises
where
electricity
the
given,
be
to
which the supply is required
for which
period for
minimum period
the minimum
required, the
supply isis required,
supply
the supply is required to be given, the
commencement of supply. The licensee shall
of
date
the
and
d
require
demand
m
maximu demand required and the date of commencement
maximum
of supply. The licensee shall
the applicable tariff, payment for
acceptable, the
application isis acceptable,
the application
that the
writing that
confirm inin writing
confirm
applicable
tariff, payment for
of the ESA 1990, if any, and amount of security
(1) of
27 (1)
section 27
under section
incurred under
expenses incurred
expenses
the ESA 1990, if any,
and
amount
of security
the licensee and approved by the regulatory
by the
required by
documentation required
any documentation
and any
required and
required
licensee and approved by the regulatory
commences.
workcommences.
beforework
bodybefore
body
4.2
4.2
shock
electricshock
agains telectric
Protec tionagainst
Protection
indirect contact. In practice direct contact
contactororindirect
directcontact
from direct
arise from
can arise
shockcan
Electric shock
Electric
contact. In practice direct contact
live conductor.
barelive
touchesaabare
persontouches
whenaaperson
occurswhen
usuallyoccurs
usually
conductor.
4.2.1
4.2.1
contac t
directcontact
agains tdirect
Protec tionagainst
04,Protection
COP04,
COP
the wiring system shall be insulated
conductorsininthe
liveconductors
contact,allalllive
directcontact,
againstdirect
protectagainst
Toprotect
To
wiring system
shall be insulated
cross linked polyeth ylene
(PVC)
chloride
vinyl
poly
as
suchas poly vinyl chloride (PVC) ororcross
mediumsuch
dielectricmedium
witha adielectric
with
linked
polyethylene
of barriers or
use
the
by
against direct contact
protectagainst
measurestotoprotect
Supplementarymeasures
(XLPE). Supplementary
(XLPE).
direct contact by the use of barriers or
aged.
encour
are
reach
outofofreach
conductorsout
liveconductors
placinglive
andplacing
enclosuresand
enclosures
are encouraged.
22
© STANDARDS MALAYSIA 2007 - All rights reserved
© STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007
4.2.2
COP 05, Earthing of equipment
All metal enclosures of electrical equipment shall be earthed (connected to a protective
and the
the
conductor). In addition, water and gas pipes, structural metal parts of the building and
ducting of the air conditioning system shall also be connected to the main equipotential
ducling
bonding.
Take note of COP 71 on equipotential bonding.
4.2.3
COP 06, Isolation on fault
In case of a fault between a live conductor and the metal enclosure of electrical equipment,
the fault shall be isolated by a circuit breaker, fuse or residual current device (RCD).
Protection against electric shock requires the fulfillment of the condition
RA x la ::; 50 V
where,
la
RA
4.2.4
(llln in the case of RCD) and the 5 s
is the operating current of the protective device (IAn
having an inverse time characteristic; and
operating current for overcurrent devices having
and protective conductor.
conductor,
is the resistance of the earth electrode and
COP 07, Requirement of earthing system
The primary requirement of the earthing system is to
to ensure
ensure effective operation of
of the
the circuit
circuit
device, the
the resistance
resistance of
of the
the
protective device. For effective operation of the circuit protective device,
installations where RCDs are
are used
used as
as the
earthing system shall be as low as possible. In installations
circuit protective device, earthing resistance of less than 10 Q will generally ensure effective
operation of the RCDs. However earthing resistance of less than 1 Q is the target.
4.3
Protection against thermal effects
There are three factors to be considered when applied to protection against thermal effects:
a)
protection against fire;
b)
and
protection against burns; and
c)
overheating,
protection against overheating.
4.3.1
COP 08, Protection against fire
electrical equipment
equipment that produces
produces heat shall
shall be
To protect against fires, as a minimum, electrical
materials that can withstand the temperatures produced.
produced. In operation,
operation, the
the
mounted within materials
malerial shall be less
less than 55°C (if the material
material is
is metalliC)
metallic) or
or
temperature attained by the material
non-metallic),
65 °c (if the material is non-metallic).
4.3.2
COP 09, Protection by placing out of reach
they are
are within
within arm's
arm's reach
reach
Electrical equipment intended to be operated in such a way that they
persons, If this
this condition
condition is not
not assured,
assured,
shall not attain temperatures likely to cause burns to persons.
put behind aa guard.
the electrical equipment shall be put
2007 - All
All rights reserved
reserved
© STANDARDS MALAYSIA 2007
33
MS 1979:2007
1979 :2007
MS
4.3.3
4.3.3
COP 10, Protection against overheating
COP 10, Protection against overheating
Forced air
air heating
heating system
system and
and appliances
appliances producing
producing hot
hot water
water or
or steam
steam shall
shall be
be equipped
equipped
Forced
with
devices
to
protect
against
overheating.
with devices to protect against overheating.
.'
4.4
4.4
Overcurrent protection
Overcurrent
protection
Overcurrent in a conductor causes a temperature rise which may result in a fire.
Overcurrent in a conductor causes a temperature rise which may result in a fire.
4.4.1
4.4.1
COP 11,
11, Overcurrent
Overcurrent protection
protection of
of phase
phase conductors
conductors
COP
Overcurrent protection shall be provided for all phase conductors.
Overcurrent protection shall be provided for all phase conductors.
4.4.2
4.4.2
COP 12,
12, Cross
Cross section
section area
area of
of neutral
neutral conductor
conductor
COP
as the
the phase
phase conductor
conductor also
also
The neutral
neutral conductor
conductor shall
shall have
have the
the same
same cross-sectional
cross-sectional area
area as
The
refer
to
COP
35
(see
4.6.16).
refer to COP 35 (see 4.6.16).
4.4.3
4.4.3
COP 13,
13, Nominal
Nominal current
current of
of protection
protection device
device
COP
(In) shall
shall be
be greater
greater than
than the
the design
design current
current (Ia).
(Is).
The nominal
nominal current
current of
of the
the protective
protective device
device (In)
The
In>
'8
4.4.4
4.4.4
COP 14,
14, Current
Current carrying
carrying capacity
capacity of
of cable
cable
COP
of the
the cable
cable (lz)
(lz) shall
shall be
be greater
greater than
than the
the nominal
nominal
The continuous
continuous current
current carrying
carrying capacity
capacity of
The
current
of
the
protective
device
(In).
current of the protective device (In).
4.4.5
4.4.5
COP is,
15, Current
Current to
to ensure
ensure effective
effective operation
operation of
of protective
protective device
device
COP
In addition
addition to
to COP
COP 14,
14, the
the current
current to
to ensure
ensure effective
effective operation
operation of
of the
the protective
protective device
device (/2)
(/2)
In
must
be
less
than
145
%
of
the
current
carrying
capacity
of
the
cable.
In
other
words,
the
must be less than 145 % of the current carrying capacity of the cable. In other words, the
protective device
device must
must operate
operate before
before the
the conductor
conductor is
is overloaded
overloaded by
by 45
45 %.
%.
protective
12 < 1.45/z
EXAMPLE
EXAMPLE
Is
Is
:=13.1A
13.1A
Choose In := 30 A
Choose In 30 A
=
2
Try a solution using 10 mm 2 PVC cable. Assuming no derating effects,
Try a solution using 10 mm PVC cable. Assuming no derating effects,
'.Iz
=52
52 A
=
A
1.45/z = 75.4 A
1.45
= 75.4 A
'z
The 30 A MCB must operate before the current reaches 75.4 A.
The 30 A MCB must operate before the current reaches 75.4 A.
44
© STANDARDS MALAYSIA 2007 - All rights reserved
© STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007
1979:2007
MS
4.4.6
4.4.6
COP 16,
16, Determination
Determination of
of short
short circuit
circuit current
current
COP
In order
order to
to design
design short
short circuit
circuit protection
protection properly,
properly, the
the short
short circuit
circuit current
current at
at every
every relevant
relevant
In
the installation
installation shall
shall be
be determined.
determined. The
The short
short circuit
circuit current
current can
can be
be obtained
obtained by
by
part of
of the
part
calculation or
or by
by measurement
measurement of
of the
the impedances
impedances at
at the
the relevant
relevant points.
points. Upon
Upon request
request the
the
calculation
electricity supply
supply body
body shall
shall provide
provide the
the short
short circuit
circuit current
current at
at the
the point
point of
of common
common coupling
coupling
electricity
the
utility's
installation.
with
with the utility's installation.
4.4.7
4.4.7
COP 17,
17, Rating
Rating of
of short
short circuit
circuit protective
protective device
device
COP
The short
short circuit
circuit protective
protective device
device shall
shall have
have aa short
short circuit
circuit breaking
breaking capacity
capacity not
not less
less than
than
The
the prospective
prospective short
short circuit
circuit current
current at
at the
the place
place of
of installation.
installation.
the
4.5
4.5
Protection against
against voltage
voltage disturbance
disturbance
Protection
Voltage disturbance
disturbance in
in the
the LV
LV system
system can
can be
be caused
caused by
by many
many factors
factors such
such as
as the
the fol/owing:
following:
Voltage
a)
a)
earth fault
fault in
in the
the LV
LV system;
system;
earth
b)
b)
loss of
of neutral
neutral in
in TT
TT system;
system;
loss
c)
c)
short circuit
circuit in
in the
the LV
LV system;
system;
short
d)
d)
lightning; and
and
lightning;
e)
e)
switching.
switching.
4.5.1
4.5.1
COP 18,
18, Common
Common earthing
earthing system
system
COP
There shall
shall be
be one
one earthing
earthing system
system for
for the
the installation
installation to
to which
which shall
shall be
be connected
connected the
the
There
following:
following:
a)
a)
earth electrodes;
electrodes;
earth
b)
b)
transformer tanks;
tanks;
transformer
c)
c)
armouring of
of cables;
cables;
armouring
d)
d)
earth wires
wires of
of the
the high
high voltage
voltage (HV)
(HV) system;
system;
earth
e)
e)
neutral of
of the
the LV
LV system;
system;
neutral
f)f)
HV and
and LV
LV switchboard
switchboard panels;
panels;
HV
g)
g)
other metal
parts e.g.
e.g. equipment
equipment control
control panels,
panels, structural
structural steel
steel works;
works; and
and
other
metal parts
h)
h)
steel bars
bars in
in reinforced
reinforced concrete
concrete foundations.
foundations.
steel
Take note
note of
of COP
COP 70
70 (see
(see 4.11.2).
4.11.2).
Take
4.5.2
4.5.2
COP 19,
19, Installation
Installation of
of SPD
SPD
COP
Where an
an installation
installation is
is supplied
supplied from
from overhead
overhead lines,
lines, itit is
is recommended
recommended to
to install
install surge
surge
Where
protective device
device (SPD).
(SPD).
protective
Take note
note of
of COP
COP 59
59 (see
(see 4.9.1).
4.9.1).
Take
© STANDARDS
STANDARDS MALAYSIA
MALAYSIA 2007
2007 -- All
All rights
rights reselVed
reserved
©
55
MS 1979:2007
1979:2007
MS
4.6
4.6
4.6.1
4.6.1
Wiring Systems
Systems
Wiring
COP 20,
20, Prevention
Prevention of
of eddy
eddy current
current
COP
When single
single core
core power
power cables
cables are
are to
to be
be terminated
terminated in
in metal
metal switchboards,
switchboards, ensure
ensure that
that all
all the
the
When
phase
and neutral
neutral conductors
conductors are
are within
within the
the switchboard
switchboard so
so as
as to
to prevent
prevent eddy
eddy current
current
phase and
be achieved,
achieved, the
the part
part of
of the
the switchboard
switchboard where
where the
the single
single core
core cables
cables
heating.
If this
this cannot
cannot be
heating. If
are
terminated shall
shall be
be made
made of
of non-ferrous
non-ferrous materials
materials e.g.
e.g. hard
hard fibre
fibre board,
board, aluminium,
aluminium, brass,
brass,
are terminated
etc.
etc.
4.6.2
4.6.2
COP 21,
21, Separation
Separation of
of HV
HV and
and LV
LV cables
cables
COP
HV and
and LV
LV cables
cables shall
shall not
not be
be installed
installed within
within the
the same
same trunking
trunking nor
nor run
run on
on the
the same
same cable
cable
HV
tray.
tray.
4.6.3
4.6.3
COP 22,
22, Installation
Installation of
of three
three phase
phase and
and single
single phase
phase circuits
circuits
COP
Three phase
phase and
and single
single phase
phase circuits
circuits LV
LV power
power cables
cables may
may be
be installed
installed within
within the
the same
same
Three
conduit or
or trunking.
trunking.
conduit
4.6.4
COP 23, Connection of dissimilar metals
When a
a connection
connection is
is made
made between
between dissimilar
dissimilar metals
metals e.g.
e.g. copper
copper to
to aluminium,
aluminium, precautions
precautions
When
environment where there is
is water, the more
more
shall be taken to avoid electrolytic effect. In an environment
noble metal (in this case copper) shall be installed in such a way that it is below the less noble
metal (aluminium in this case) when considered in the direction of the flow of water. Specially
be used
used to
to connect
connect dissimilar
dissimilar conductors
conductors e.g.
e.g. copper
copper and
and
made bimetallic
bimetallic connectors
connectors shall
shall be
made
aluminium.
4.6.5
COP 24, Installation of conductors in buried cable ducts
Conduits or cable duct systems intended to be buried in structures shall be completely
erected for each circuit before any insulated conductor is drawn in.
4.6.6
COP 25, Bending radius of cables
The radius of every bend in the wiring system shall be sufficiently large to prevent damage to
to
radius of 12 times the diameter
diameter of
of the
the
the cables. For common wiring installations, a bending radius
order to satisfy this criterion,
criterion, elbows
elbows and
and junction
junction
cable would normally be adequate. In order
direction.
boxes shall be included at places where the cable run changes direction,
4.6.7
COP 26, Support for vertical cables
damaged by
by
When cables of large cross-section areas are installed vertically, they may be damaged
supported at
at regular intervals
intervals of
of 1 m
m by
by
their own weight. Hence they shall be adequately supported
cable clamps or cable ties.
4.6.8
COP 27, Space factor
When cables are installed within conduits, a space factor of
of 40 %
% shall
shall be
be maintained.
maintained. When
When
a cable trunking is used, the space factor shall be 45 %.
6
STANDARDS MALAYSIA
MALAYSIA 2007
2007 - All rights
rights reserved
reserved
© STANDARDS
MS 1979:2007
of cables
cables (including
(including insulation)
insulation)
Space factor = Sum of cross section areas of
Internal cross
cross section area of conduitltrunking
conduitltrunking
4.6.9
COP 28, Cables installed behind walls
shall be installed
installed horizontally
horizontally or
or vertically
vertically
Where cables are installed buried behind walls, they shall
i.e. parallel to the edges of the room. Subject to the dimensions of
of the columns
columns and
and beams,
beams,
Le.
of the
the wall.
wall.
they shall be within 150 mm from the top of the walls and 150 mm from the edge of
4.6.10
COP 29, Mechanical protection for cables within walls
mechanical protection
protection such
such as
as aa conduit.
conduit.
Cables installed within walls shall be provided with mechanical
allowed.
Direct installation of cables within walls is not allowed,
4.6.11
COP 30, Cables installed within ceiling space
ceiling space under the
the roof,
Where cables are installed behind suspended ceilings or the ceiling
approved
they shall be provided with mechanical protection such as being installed within approved
conduits. In addition they shall be installed either parallel or perpendicular to the edges of
of the
the
walls.
4.6.12
COP 31, Water heater circuits
cop
installed at
at aa
A circuit intended to supply a water heater shall have a double pole switch installed
outlet (an
(an
suitable location. In the vicinity of the water heater, there shall be a socket outlet
unswitched type is acceptable) to facilitate the connection of the circuit to the apparatus and
to facilitate disconnection during maintenance.
4.6.13
COP 32, Air conditioner circuits
cop
A circuit intended to supply an air conditioner shall have a socket outlet (an unswitched type
is acceptable) in the vicinity of the air conditioner to facilitate the connection of
of the circuit
circuit to
to
the apparatus and to facilitate disconnection during maintenance.
4.6.14
COP 33, Group reduction factors
When groups of cables are run together, a group reduction factor shall be applied to take into
account the heat generated by the loaded cables.
Take note of COP 08 for protection against fire.
Take note of COP 21 for separation of HV and LV cables.
4.6.15
COP 34, Consideration for loaded conductors
that carry
When considering the number of loaded conductors, only the conductors in a circuit that
load shall be considered. Hence the neutral conductor of a balanced three phase circuit need
not be considered.
© STANDARDS MALAYSIA 2007 - All rights reserved
7
2007
MS
MS1979:
1979:2007
ctor
l condu
COP
35,Size
Sizeof
ofneutra
neutral
conductor
COP35,
4.6.16
4.6.16
ent that have their own power supplies, harmonic
ic equipm
ing use
With
Withthe
theincreas
increasing
useofofelectron
electronic
equipment that have their
own power supplies, harmonic
the neutral conductor to carry current. To cater for
s will
s ininthree
current
currents
threephase
phasesystem
systems
willcause
cause the neutral conductor tor
to carry
current.
To shall
cater be
for
system
in wiring
of the neutral conduc
m, the
this
thisneutral
neutralcurrent,
current, as
asaaminimu
minimum,
the size
size of the neutrai conductor
in
wiring
system
shall
be
refer to COP 12 (see 4.4.2).
tors: Also
the
thesame
sameas
asthe
thephase
phaseconduc
conductors:
Also refer to COP 12 (see 4.4.2),
on at the discret ion of Profes sional Design
ctor reducti
l condu
COP
4.6.17
4.6.17
COP 36,
36, Neutra
Neutral
conductor
reduction at the discretion of Professional Design
er
al Engine
Electric
Electrical
Engineer
ional design electrical engineer may reduce the size of
standing COP
Notwith
Notwithstanding
COP 35,
35, the
the profess
professional design electrical engineer
may reduce the size of
rmer and the main SWitchboard after taking into
n the
tors betwee
the
the neutral
neutral conduc
conductors
between
the transfo
transformer and the main switchboard after taking into
ar electrical installation.
ments of
t the
accoun
account
the require
requirements
of the
the particul
particular electrical installation.
ted in parallel
tors connec
COP
COP 37,
37, Phase
Phase conduc
conductors
connected in parallel
4.6.18
4.6.18
ted in parallel in the same phase. (This is especially
tors may
Two
Two or
or more
more conduc
conductors
may be
be connec
connected in parallel in the of
same
phase.
(This
is especially
tor may
conduc
large
a single
is high and the use
ns when
so
so in
in situatio
situations
when the
the load
load current
current is high and the use of a
single
large
conductor
the
s may
improve
tion
installa
of
type
this
,
Further
tion.
ies during
presen
presentt difficult
difficulties
during installa
installation.
Further, this type of installation improves the
circuit).
tibility (EMC)
agnetic compa
electrom
electromagnetic
compatibility
(EMC) of
of the
the circuit),
the most onerou s condit ion
for the
e for
COP
COP 38,
38, Cable
Cable suitabl
suitable
most onerous condition
4.6.19
installation conditions that have different heat
different installation
of different
consist of
may consist
route may
A cable
cable route
conditions that have different heat
capacity of the cable shall be selected based on
carrying capacity
current carrying
The current
properties. The
diSSipation properties.
dissipation
of the cable shall be selected based on
the cable route.
along the
encountered along
condition encountered
onerous condition
most onerous
the most
cable route.
4.6.20
conduc tors
wiring conductors
of wiring
size of
Minimu m size
39, Minimum
COP 39,
COP
conductors used for wiring purposes shall be 1.5
live conductors
of live
areas of
sectional areas
cross sectional
minimum cross
The minimum
The
used for wiring purposes shall be 1.5
2
2
2
2
um.
alumini
mm aluminium.
2.5 mm
or 2.5
copper or
mm copper
mm
4.6.21
4.6.21
circuit
every circuit
for every
condu ctor for
Neutra l conductor
40, Neutral
COP 40,
COP
conductor which shall be clearly identifiable
neutral conductor
separate neutral
be aaseparate
shall be
there shall
circuit there
every circuit
For every
For
which shall be clearly identifiable
arranged in the same order as the circuits.
and arranged
unitand
consumer unit
orconsumer
board or
distribution board
the distribution
at the
at
in the same order as the circuits.
4.6.22
4.6.22
drop
voltagedrop
Allowa blevoltage
41, Allowable
COP 41,
COP
consumer's installation and the equipment shall
the consumer's
of the
origin of
the origin
between the
drop between
voltage drop
The voltage
The
installation and the equipment shall
installation. Voltage drops during temporary
the installation.
voltage ofof the
nominal voltage
the nominal
%ofof the
exceed 44 %
not exceed
not
Voltage drops during temporary
exempted from this requirement. For most
be exempted
may be
starting may
motor starting
as motor
such as
conditions such
conditions
from be
thisaccepta
requirement.
For most
ble.
motor starting may
duringmotor
10%%during
dropofof10
voltagedrop
installations, aavoltage
installations,
starting may be acceptable.
4.7
4.7
4.7.1
4.7.1
connec tions
Electric alconnections
Electrical
connec tions
Solder edconnections
42,Soldered
COP42,
COP
conductors or to terminate conductors.
connectconductors
usedtotoconnect
beused
notbe
shallnot
connectionsshall
Solderedconnections
Soldered
or to terminate conductors.
4.7.2
4.7.2
for connec tions
crimpsfor
andcrimps
socket sand
Useofofsockets
43,Use
COP43,
connections
COP
shall be made by sockets and crimping.
conductorsshall
lengthsofofconductors
twolengths
betweentwo
Connectionsbetween
Connections
be made by sockets and crimping.
88
© STANDARDS MALAYS IA 2007 - All rights reserved
© STANDARDS MALAYSIA 2007 All rights reserved
MS 1979:2007
4.7.3
COP 44, Cables for final sub-circuits
subwcircuits
Cables used in final
final sUb-circuits
sub-circuits in LV installations shall not be joined.
4.7.4
COP 45, Sealing of partitions
Where
Where aa wiring
wiring system
system passes through walls, floors, partitions etc in a building, the openings
shall
shall be
be sealed
sealed with
with fire
fire retardant
retardant compounds. If the wiring system includes conduits or cable
trunking,
trunking, then in
in addition
addition to
to the
the above, the internal of the conduit or cable trunking shall also
be
be sealed
sealed with
with fire
fire retardant compounds.
compounds.
4.8
4.8.1
4.8.1
Switching and Control
COP
COP 46, Multi.pole
Multi-pole switching devices
All
All poles
poles of
of aa multi-pole
multi-pole circuit
circuit breaker or disconnector shall operate together.
together. The contact for
the
the neutral
neutral may
may close
close before
before and
and open after
after the
the phase
phase contacts.
4.8.2
4.8.2
COP 47,
47, No MCB
MCB or fuse
fuse in a neutral conductor
A
A miniature
miniature circuit
circuit breaker
breaker (MCB)
(MCB) or
or fuse
fuse shall
shall not be
be inserted
inserted in the
the neutral
neutral conductor of a
three
three phase
phase or
or aa single
single phase
phase circuit.
circuit.
4.8.3
4.8.3
COP
COP 48,
48, Operation
Operation of
of RCD
In
In operation,
operation, aa RCD
ReO shall
shall ensure
ensure the
the disconnection
disconnection of
of all
all live
live conductors
conductors in
in the
the circuit
protected.
protected.
4.8.4
4.8.4
COP
COP 49,
49, Protective
Protective conductor
conductor of
of a circuit
circuit
The
The protective
protective conductor
conductor (or
(or earth
earth wire)
wire) of
of aa circuit
circuit shall
shall not
not pass
pass through
through the
the magnetic
magnetic circuit
of
of an
an RCD.
ReO.
4.8.5
4.8.5
COP
COP 50,
50, Current
Current operated
operated RCD
RCD
RCD
Reo shall
shall be
be of
of the
the current
current operated
operated type;
type; earth
earth leakage
leakage circuit
circuit breaker
breaker (ELCB)
(ELCB) of
of the
the voltage
voltage
operated
operated type
type shall
shall not
not be
be used.
used.
4.8.6
4.8.6
COP
COP 51,
51, RCD
RCD for
for single
single phase
phase circuit
circuit
RCDs
RCDs for
for single
single phase
phase installations
installations shall
shall have
have rated
rated residual
residual operating
operating current
current not
not exceeding
exceeding
100
100 mA.
rnA.
4.8.7
4.8.7
COP
COP 52,
52, RCD
ReO for
for three
three phase
phase circuit
circuit
RCDs
ReDs for
for three
three phase
phase systems
systems shall
shall have
have rated
rated residual
residual operating
operating current
current not
not exceeding
exceeding
100 mA.
mA. Provided
Provided there
there are
are no
no three
three phase
phase loads
loads in
in the
the installation,
installation, itit is
is recommended
recommended to
to
100
install three
three single
single phase
phase RCD
ReD instead
instead of
of aa three
three phase
phase RCD
RCD in
in aa three
three phase
phase installation.
installation.
install
This practice
practice will
will reduce
reduce the
the extent
extent of
of power
power disruption
disruption in
in the
the installation
installation in
in case
case there
there is
is aa
This
fault
fault in
in one
one phase.
phase.
© STANDARDS
STANDARDS MALAYSIA
MAlAYSIA 2007·
2007· All
All rights
rights reserved
reserved
©
99
MS 1979:2007
4.8.8
4.8.8
COP 53,
53, RCD
RCO for
for hand
hand held
held equipment
equipment
COP
RCDs with
rated residual
residual operating
operating current
current not
not exceeding
exceeding 30
30 mA
mA shall
shall be
be installed
installed in
in
RCDs
with rated
installations where
hand held
held equipment
equipment (generally
(generally power
power tools)
tools) is
is used.
used.
installations
where hand
4.8.9
4.8.9
COP 54,
54, RCD
RCO for
for special
special places
places
COP
10 mA
mA shall
shall be
be installed
installed in
in the
the
RCDs with
with rated
rated residual
residual operating
operating current
current not
not exceeding
exceeding 10
RCDs
following
instances:
following instances:
a)
in places of public entertainment;
b)
b)
where the
the floor
floor is
is likely
likely to
to be
be wet;
wet; and
and
where
c)
c)
for the
the protection
protection of
of electric
electric water
water heaters.
heaters.
for
4.8.10
COP 55, Location
Location of
of RCD
RCO
COP
is protected
protected by
by a
a single
single RCD,
RCD, itit shall
shall be
be located
located at
at the
the origin
origin of
of the
the
If an
an installation
installation is
If
installation.
installation.
4.8.11
COP 56, Regular testing of RCD
An installation protected by an RCD shall be tested at least two times a year to ensure its
proper operation.
operation. The
The test
test shall
shall be
be carried
carried out
out in
in accordance
accordance to
to the
the manufacturers'
manufacturers'
proper
recommendations or by the use of RCD testing equipment approved for this purpose.
4.8.12
device
COP 57, Selection of short circuit protective device
circuit
Selection of a short circuit protective device shall be based on its rated service short circuit
breaking capacity instead of its ultimate short circuit breaking capacity,
capacity.
4.8.13
COP 58, Requirement for devices for emergency switching
Devices for emergency switching shall be red in colour and clearly identified.
identified. They
They shall be
be of
of
the latching type or restrained in the "STOP" position. When released, the emergency
switching device shall not re-energise the installation.
4.9
4.9.1
Surge Protective Devices
COP 59, Installation of SPD
SPO
To protect against lightning surges or overvoltage surges, it is recommended to install a surge
recommended to be
be
protective device (SPD) near the origin of the installation. The SPD is recommended
RCD (on the supply side).
installed before the RCO
Take note of COP 19 (see 4.5.2) on installing SPO
SPD for electricity supply fed
fed from
from overhead
overhead
lines.
4.9.2
SPD
COP 60, Use of gPD
SPD shall be
be at least 1,1
1.1 Vo
Va where Vo
Va isis
The maximum continuous operating voltage Vc of the SPO
neutralvoltage of the
the LV installation which
which is commonly 240 Va.c.Va.c.
the line to neutraLvoltage
10
© STANDARDS
STANDARDS MALAYSIA
MALAYSIA 2007
2007 -- All
All rights
rights reserved
reserved
©
MS 1979:2007
1979:2007
MS
4.9.3
4.9.3
COP 61.
61, Rating
Rating of
of gPO
SPO
COP
The nominal
nominal discharge
discharge current
current In
In of
of the
the SPO
SPD shall
shall not
not be
be less
less than
than 55 kA.
kA.
The
4.9.4
4.9.4
COP 62,
62, Protection
Protection of
of electronic
electronic devices
devices by
by gPO
SPO
COP
Additional SPO
SPD is
is recommended
recommended to
to be
be installed
installed near
near sensitive
sensitive electronic
electronic equipment.
equipment.
Additional
4.9.5
4.9.5
COP 63,
63, Installation
Installation of
of gPO
SPO in
in special
special environments
environments
COP
SPD installed
installed in
in environments
environments where
where there
there is
is aa risk
risk of
of fire
fire (category
(category BE2)
BE2) or
or risk
risk of
of explosion
explosion
SPO
be appropriately
appropriately protected
protected to
to prevent
prevent this
this risk.
risk.
(category BE3)
BE3) shall
shall be
(category
4.9.6
4.9.6
of gPO
SPO
COP 64,
64, Earth
Earth connection
connection of
COP
For SPOs
SPDs to
to function
function properly
properly an
an effective
effective connection
connection to
to earth
earth is
is essential.
essential. The
The minimum
minimum
For
cross section
section area
area of
of the
the conductor
conductor connecting
connecting the
the SPO
SPO to
to the
the main
main earthing
earthing terminal
terminal shall
shall be
be
cross
2
2 copper. The connection shall be as short as possible (not more than 0.5 m).
10
mm
10 mm copper. The connection shall be as short as possible (not more than 0.5 m).
4.10
4.10
4.10.1
4.10.1
Isolation
Isolation
COP 65,
65, Requirement
Requirement for
for circuit
circuit isolation
isolation
COP
the live
live supply
supply
Every circuit
circuit shall
shall be
be provided
provided with
with aa means
means of
of isolation
isolation from
from each
each of
of the
Every
conductors
of
the
source
of
supply.
conductors of the source of supply.
4.10.2
4.10.2
COP 66,
66, Marking
Marking of
of isolation
isolation devices
devices
COP
The isolation
isolation devices
devices e.g.
e.g. MCB
MCB shall
shall have
have markings
markings to
to indicate
indicate that
that the
the contacts
contacts are
are open
open
The
or
'0').
(OFF
(OFF or '0').
4.10.3
4.10.3
67, Prohibition
Prohibition on
on the
the use
use of
of semiconductor
semiconductor devices
devices for
for isolation
isolation
COP 67,
COP
be used
used for
for isolation.
isolation.
Semiconductor devices
devices shall
shall not
not be
Semiconductor
4.10.4
4.10.4
COP 68,
68, Prevention
Prevention of
of unintentional
unintentional re-energising
re-energising
COP
be provided
provided to
to prevent
prevent electrically
electrically operated
operated equipment
equipment from
from being
being unintentionally
unintentionally
Means shall
shall be
Means
re-energised during
during maintenance
maintenance by
by padlocking,
padlocking, warning
warning notices
notices or
or installation
installation within
within lockable
lockable
re-energised
enclosures.
enclosures.
4.11
4.11
4.11.1
4.11.1
Earthing
Earthing
COP 69,
69, Uses
Uses of
of earthing
earthing system
system
COP
or itit may
may also
also serve
serve other
other
The earthing
earthing system
system may
may be
be used
used solely
solely for
for protective
protective purpose
purpose or
The
as the
the reference
reference earth
earth for
for electronic
electronic systems,
systems, including
including ICT
ICT
functional purposes
purposes e.g.
e.g. as
functional
purposes.
purposes.
4.11.2
4.11.2
COP 70,
70, Earth
Earth electrodes
electrodes
COP
Earth electrodes
electrodes may
may be
be established
established using
using round
round copper
copper sheathed
sheathed steel
steel rods,
rods, copper
copper tapes
tapes or
or
Earth
conductors,
rods
or
pipes
or
steel
bars
in
reinforced
concrete
foundations
of
buildings.
conductors, rods or pipes o~ steel bars in reinforced concrete foundations of buildings.
© STANDARDS
STANDARDS MALAYSIA
MALAYSIA 2007
2007 -- All
All rights
rights reserved
reserved
©
11
11
MS 1979:2007
1979:2007
MS
Wherever reinforced
reinforced concrete
concrete pile
pile foundations
foundations exist,
exist, they
they shall
shall be
be incorporated
incorporated into
into the
the
Wherever
building's
earthing
system.
building's earthing system.
Take note
note of
of COP
COP 18
18 (see
(see 4.5.1)
4.5.1) for
for one
one common
common earthing
earthing system.
system.
Take
4.11.3
4.11.3
COP 71,
71, Restrictions
Restrictions on
on the
the use
use of
of water
water or
or gas
gas pipes
pipes for
for earthing
earthing
COP
Water pipes
pipes or
or gas
gas pipes
pipes shall
shall not
not be
be used
used as
as the
the sole
sale means
means of
of earthing
earthing but
but protective
protective
Water
to these
these pipes
pipes is
is permitted.
permitted.
equipotential bonding
bonding to
equipotential
Take note
note of
of CO
COP
05 on
on earthing
earthing of
of water
water pipes
pipes and
and gas
gas pipes.
pipes.
P 05
Take
4.11.4
4.11.4
COP 72,
72, Maintenance
Maintenance of
of earthing
earthing system
system
COP
be effectively
effectively maintained
maintained and
and checked
checked
The earthing
earthing system
system of
of electrical
electrical installations
installations shall
shall be
The
annually.
annually.
4.11.5
4.11.5
COP 73,
73, Minimum
Minimum size
size of
of earthing
earthing conductors
conductors
COP
in the
the soil
soil and
and without
without protection
protection against
against
The minimum
minimum size
size of
of earthing
earthing conductors
conductors buried
buried in
The
2
2
be 25
25 mm
mm2 bare
bare copper.
copper. This
This value
value can
can be
be reduced
reduced to
to 16
16 mm
mm2 copper
copper
corrosion shall
shall be
corrosion
it
is
protected
against
corrosion.
conductor
if
conductor if it is protected against corrosion.
4.11.6
4.11.6
COP 74,
74, Methods of connecting earthing
earthing conductors
conductors
For connections
connections of
of earth
earth conductors
conductors that
that are
are buried
buried in
in the
the ground,
ground, connections
connections made
made using
using
For
electrodes that
that require
require periodic
periodic
exothermic welding is recommended. Connections to earth electrodes
be used.
used.
inspection at
at earth
earth electrode
electrode inspection
inspection chambers,
chambers, connections
connections using
using clamps
clamps may
may be
inspection
4.11.7
4.11.7
COP 75, Selection of protective conductors
to withstand
withstand the
the prospective
prospective fault
fault current
current and
and
Every protective
protective conductor
conductor must
must be
be selected
selected to
Every
ensure
automatic
disconnection
of
supply.
ensure automatic disconnection of supply.
4.11.8
COP 76,
76, Size
Size of
of protective
protective conductors
conductors
cop
In final sub-circuits, the protective conductor shall have In connections
connections between switchboards,
switchboards,
calculations:
protective conductors of the following sizes may be used without calculations:
a) Same
Same size
size as
as the
the line
line conductor
conductor ifif the
the cross
cross sectional
sectional area
area of
of the
the line
line conductor
conductor is
is
a)
2
less then 16 mm2 •.
2
2
of the line conductor is more than 16
16 mm 22 but
but less
less
b) 16 mm if the cross sectional
area of
2
than or equal to 35 mm 2••
sectional area
area of the line
line conductor
conductor exceeds
exceeds
c) Half the
line conductor if the cross sectional
2
35 mm 2 ,, the same size as the phase conductors.
4.12
4.12
4.12.1
Protective bonding conductor
COP 77, Size of protective bonding conductors
the main earthing
The cross sectional area for protective
bonding conductor connected to the
2
for aluminium.
aluminium.
terminal shall not be less than 6 mm 2 for copper or 16 mm22 for
12
© STANDARDS MALAYSIA
MALAYSIA 2007
2007 - All rights
rights reserved
reserved
@STANDARDS
MS 1979:2007
4.13
4.13.1
supply
Change-over switch of a standby generating set
COP 78, Prevention of parallel operation of standby system with the public
When the generating set in the installation is used as a standby system to the public supply
system, means of isolation to prevent parallel operations shall be taken.
4.13.2
COP 79, Separate neutral for the standby system
When operating on the standby supply, the neutral of the supply shall be changed.
4.13.3
COP 80, Overcurrent protection for essential services
be
If a standby generating set supplies essential services fire fighting pumpsets, it shall not be
device is provided,
provided with overcurrent protective devices. If an overcurrent protective device
it shall be connected to provide an alarm only.
4.14
4.14.1
installations
Initial verification of Installations
COP 81, Initial inspection of installation
to being
being
Every installation shall be inspected during erection or upon completion prior to
energised.
4.14.2
installations
COP 82, Supervision of work on LV single phase Installations
LV installations receiving single phase supply shall be carried out under the immediate
supervision of a Wireman with Single Phase Restriction or a wireman with Three Phase
Restriction and upon completion, the Wireman shall certify a Supervision and Completion
Certificate known as Form G. This a requirement under the Electricity Regulations 1994.
4.14.3
COP 83, Supervision of work on LV three phase installations
LV installations receiving three phase supply shall be carried out under the immediate
supervision of a Wireman with Three Phase Restriction and upon completion, the Wireman
G. This
This is
is aa
shall certify a Supervision and Completion Certificate known
known as Form G.
requirement under the Electricity Regulations 1994.
4.14.4
COP 84, Testing of work on LV single phase installations
be
Upon completion of wiring or rewiring or extension of a single phase LV installation, it shall be
tested by a Wireman with Single Phase Restriction or a wireman with Three Phase Restriction
Restriction
Test Certificate
Certificate for
for the
the
authorised to test any installation. The Wireman shall then certify a Test
under the Electricity Regulations 1994.
1994.
installation known as Form H. This is a requirement under
4.14.5
COP 85, Testing of work on LV three phase installations
cop
Upon completion of wiring or rewiring or extension of a three phase LV installation, it shall
shall be
be
tested by a Wireman with Three Phase Restriction authorised to test any installation. The
Wireman shall then certify a Test Certificate for the installation known as Form H.
© STANDARDS MALAYSIA 2007 - All rights reserved
13
MS 1979:2007
1979:2007
MS
4.14.6
4.14.6
COP 86,
86, Testing
Testing by
by Electrical
Electrical Services
Services Engineer
Engineer
COP
Upon completion
completion of
of an
an installation
installation or
or extension
extension to
to an
an existing
existing installation
installation operating
operating at
at higher
higher
Upon
than low
low voltage,
voltage, the
the installation
installation shall
shall be
be tested
tested by
by an
an Electrical
Electrical Services
Services Engineer
Engineer and
and who
who
than
as Form
Form H.
H.
shall certify
certify a
a Test
Test Certificate
Certificate for
for the
the installation
installation known
known as
shall
4.14.7
4.14.7
COP 87,
87, Condition
Condition precedent
precedent for
for receipt
receipt of
of electricity
electricity
COP
The installation
installation shall
shall not
not receive
receive electricity
electricity from
from the
the electricity
electricity supply
supply body
body until
until the
the
The
and
Test
Certificate
has
been
submitted
by
the
owner
Supervision
and
Completion
Certificate
Supervision and Completion Certificate and Test Certificate has been submitted by the owner
or management
management of
of the
the installation
installation to
to the
the licensee
licensee or
or supply
supply authority.
authority.
or
4.14.8
4.14.8
COP 88,
88, Insulation
Insulation tests
tests on
on LV
LV installations
installations
COP
Insulation measurements
measurements shall
shall be
be carried
carried out
out on
on completed
completed LV
LV installations
installations using
using d.c.
d.c,
Insulation
voltages. When
When 500
500 V
V d.c.
d.c, is
is applied
applied to
to each
each circuit,
circuit, the
the insulation
insulation resistance
resistance shall
shall be
be more
more
voltages.
than 11 MO.
MO.
than
4.14.9
4.14.9
COP 89,
89, Circuit
Circuit checks
checks
COP
Circuits shall
shall be
be checked
checked and
and the
the circuit
circuit interruption/isolation
interruption/isolation devices
devices verified
verified against
against the
the
Circuits
electrical
diagrams.
electrical diagrams.
4.14.10
COP 90, Requirement for labelling
All circuits
circuits and
and circuit
circuit components
components shall
shall be
be clearly
clearly labelled
labelled using
using Bahasa
Bahasa Malaysia
Malaysia or
or English.
English,
All
4.14.11
COP 91, As-built diagrams
Every completed installation shall have the as-built electrical diagrams
diagrams of
of the installation
installation
The diagrams
diagrams shall be
be
prominently displayed for safety in operation and maintenance. The
endorsed by
by the
the professional
professional design
design electrical
electrical engineer.
engineer.
endorsed
14
© STANDARDS MALAYSIA 2007
2007 -- All
All rights reserved
reserved
Acknowledgements
Ir Rocky Wong Han
Hon Thang (Chairman)
Ms Khong Choy Tai (Secretary)
Ir Goon Kid Seng
Ir Looi Hip Peu
Engr Fu Wing Hoong
Ir Chew Shee Fuee
Mr Radzuan Mohd Nor
Kuen
Ir Chuang Chu KUen
Mr Ramli Baba
Mr Tan Ah Hock
Mr Mohd Ismail
Ir Fairus Abd Manaf
Talib
Ir Faridon TaUb
FatU
Mr Richard Lew Min FaW
Mr Khoo Lin Siang
Ir Halim Osman
Dr Hew Wooi Ping
Prof Dr Hussein Ahmad
The Electrical and Electronics
Electronics Association
Association of
of Malaysia
Malaysia
The Electrical and
and Electronics
Electronics Association
Association of
of Malaysia
Malaysia
The
Association of
of Malaysia
Malaysia
The Electrical and Electronics Association
Malaysia
Association of Consulting Engineers Malaysia
EITA
Holdings Sdn
Sdn Bhd
Bhd
EIT
A Holdings
Engineering (1990)
(1990) Sdn
Sdn Bhd
Bhd
G. H. Liew Engineering
Bomba dan
dan Penyelamat
Penyelamat Malaysia
Malaysia
Jabatan Bomba
Jabatan Kerja Raya
Sabah Electricity Sdn
Sdn Bhd
Bhd
Electricity Supply Corporation
Sarawak Electricity
QAS International Sdn
Sdn Bhd
Bhd
SIRIM QAS
Testing Section)
Section)
(Electrotechnical Testing
Suruhanjaya Tenaga
Tenaga
The Institution of Engineers, Malaysia
Time Era Sdn Bhd
Division
TNB Distribution Division
Malaya
Universiti Malaya
Teknologi Malaysia
Malaysia
Universiti Teknologi
reserved
© STANDARDS MALAYSIA 2007 - All rights reserved