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ISBN 978-0-626-26724-7
SANS 1574-2:2012
Edition 1
SOUTH AFRICAN NATIONAL STANDARD
Electric flexible cables with solid extruded
dielectric insulation
Part 2: PVC insulated flexible cables for
domestic, office and similar environments
(cords)
Published by SABS Standards Division
1 Dr Lategan Road Groenkloof
Private Bag X191 Pretoria 0001
Tel: +27 12 428 7911 Fax: +27 12 344 1568
www.sabs.co.za
© SABS
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SANS 1574-2:2012
Edition 1
Table of changes
Change No.
Date
Scope
Foreword
This South African standard was approved by National Committee SABS TC 66, Electric cables, in
accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the
WTO/TBT agreement.
This document was published in December 2012.
This document supersedes SANS 60227-5:2006 (edition 1.2).
SANS 1574 consists of the following parts, under the general title Electric flexible cables with solid
extruded dielectric insulation:
Part 1: General.
Part 2: PVC insulated cables for domestic, office and similar environments (cords).
Part 3: PVC-insulated cables for industrial use.
Part 4: Rubber-insulated cables for domestic, office and similar environments (cords).
Part 5: Rubber-insulated cables for industrial use.
Annexes A and B are for information purposes only.
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SANS 1574-2:2012
Edition 1
Contents
Page
Foreword
1 Scope .....................................................................................................................................
3
2 Normative references .............................................................................................................
3
3 Definitions ..............................................................................................................................
4
4 General requirements ............................................................................................................
4
5 Specific requirements for types of flexible cords in common use ..........................................
9
6 Packing and marking ............................................................................................................. 14
7 Inspection and methods of test ............................................................................................... 14
Annex A (informative) System for designation of harmonized cables and cords ...................
17
Annex B (informative) Guide to the use of insulated flexible cables ......................................... 18
Bibliography..............................................................................................................................
20
1
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2
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SANS 1574-2:2012
Edition 1
Electric flexible cables with solid extruded dielectric insulation
Part 2:
PVC insulated flexible cables for domestic, office and similar environments
(cords)
1 Scope
1.1 This part of SANS 1574 specifies the characteristics of single-core flexible insulated wires and
multi-core flexible cords, of rated operating voltage up to and including 300 V to earth and
500 V between conductors, and is intended for use with electrical appliances in domestic, office and
similar applications. Insulating and sheathing materials of PVC are covered.
NOTE 1 Unsheathed PVC insulated Ripcord has been removed from the SANS 1574 series for safety
reasons. Type P3 and P10 products are recommended as replacements for this product.
2
NOTE 2 Cords of 4 mm are excluded from this part of the standard and it is recommended that cables of this
size, which are intended for industrial use, be manufactured to SANS 1574-3.
1.2 Specific requirements are given for a number of types of cords in common use but this
standard covers any type of cord or wire that falls within the limitation of 1.1. The types for which
specific requirements are given are the following:
a) Type P1
:Normal duty, non-sheathed, 300/500V single core (H05V-F);
b) Type P3
:Light duty, sheathed, flat 300/300V (H03VVH2-F);
c) Type P5
:Normal duty, sheathed, circular 300/500V (H05VV-F);
d) Type P7
:Light duty, sheathed, circular 300/300V (H03VV-F);
e) Type P10 :Normal duty, sheathed, flat 300/500V (H05VVH2-F);
f) Type P14 :Light duty extensible lead 300/300V (H03VVH8-F and H03VVH2H8-F); and
g) Type P15 :Normal duty extensible lead 300/500V (H05VVH8-F and H05VVH2H8-F).
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For updated references, the latest edition of the
referenced document (including any amendments) applies. Information on currently valid national
and international standards may be obtained from the SABS Standards Division.
SANS 1411-1, Materials of insulated electric cables and flexible cords – Part 1: Conductors.
3
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SANS 1574-2:2012
Edition 1
SANS 1411-2, Materials of insulated electric cables and flexible cords – Part 2: Polyvinyl chloride
(PVC).
SANS 1507-1, Electric cables with extruded solid dielectric insulation for fixed installations
(300/500 V to 1 900/3 300 V) – Part 1: General.
SANS 5515, Flexing test on flexible cords.
SANS 1574-1, Electric flexible cores, codes and cables with solid extruded dielectric insulation –
Part 1: General.
SANS 5526, Dielectric resistance of electric cables.
SANS 6205, Extensibility test for extensible leads.
SANS 6208, Extension test for extensible leads.
SANS 6282-1, Test methods for bare conductors and conductors of insulated electric cables – Part
1: Conductor resistance.
SANS 6284-3, Test methods for cross-linked polyethylene (XLPE) insulated electric cables – Part 3:
Tests on finished cable.
SANS 60811-1-1/IEC 60811-1-1, Common test methods for insulating and sheathing materials of
electric cables and optical cables – Part 1-1: Methods for general application – Measurement of
thickness and overall dimensions – Tests for determining mechanical properties.
SANS 62230/IEC 62230, Electric cables – Spark-test method.
3 Definitions
For the purposes of this document, the definitions given in SANS 1411-1, SANS 1411-2,
SANS1507-1 and SANS 1574-1 apply.
4 General requirements
4.1 Operating voltage
The maximum operating voltage (Uo/U) of a flexible cord shall be 300/300 V or 300/500 V.
4.2 Materials and construction
4.2.1 Conductors
Conductors shall comply with the requirements for class 5 plain or tinned copper of SANS 1411-1,
unless otherwise stated in the relevant specific requirements given in clause 5.
4.2.2 Insulation
4.2.2.1 Material
The insulation shall be of solid extruded dielectric of one of the types given in column 2 of table 1,
and shall comply with the relevant requirements of the applicable specification given in column 3.
4
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SANS 1574-2:2012
Edition 1
4.2.2.2 Application
The insulation shall be closely applied to the conductor or separator. It shall be possible to remove
the insulation without damage to the insulation itself or to the conductor or to any coating.
4.2.2.3 Thickness and insulation resistance
Unless otherwise stated in the relevant specific requirements given in clause 5, the nominal
thickness and the insulation resistance shall comply with the requirements given in table 4, for
nominal thickness, as appropriate to the type of material, conductor size and operating voltage.
When the thickness of the insulation is determined in accordance with 7.5.1, the average thickness
shall be at least equal to the nominal value, and the minimum thickness at any point shall be not
less than the corresponding minimum value given in table 4.
4.2.2.4 Spark testing of insulation
During manufacture, the core insulation shall have been continuously spark tested, using the
method given in SANS 62230 at an a.c. (r.m.s.) spark test voltage of 5 000 V without breakdown of
the dielectric. Alternatively, a dc spark test voltage of 7 500 V may be used.
4.3 Core identification
4.3.1 Identification
Cores of flexible cords shall be identified by colouring up to seven cores and by numbering for more
than seven cores. The colours shall be as given in table 2, unless otherwise stated in the relevant
specific requirements given in clause 5.
4.3.2 Colour application
Colour shall be applied
a) throughout the thickness of the insulation; or
b) in a durable manner on the entire surface of the insulation.
4.3.3 Earthing cores
An earthing core shall be coloured green and yellow, and the combination of the colours shall be
such that one of the colours covers not less than 30 % and not more than 70 % of the surface of the
core, and the other covers the remainder of the surface. There shall be no green/yellow coloured
core in a two-core cord or in any non-earthing type cord.
NOTE The combination of green/yellow is reserved exclusively for the identification of the earthing core (see
annex A).
4.3.4 Assembly of cores
4.3.4.1 General
Unless otherwise stated in the relevant specific requirements given in clause 5, cores of a multicore flexible circular cord shall be compactly laid up (when relevant, in the correct sequence of their
identification colours (see table 2)), with an acceptable lay or straight in the case of flat cables with
parallel cores.
5
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SANS 1574-2:2012
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4.3.4.2 Fillers
Fillers may be applied either separately or integrally with the sheath and shall be used in the
interstices of the flexible cord where necessary, to give the completed flexible cord an acceptable
compact circular profile.
4.4 Protective covering
4.4.1 Material
A protective covering, where required, shall consist of one of the materials given in column 2 of
table 3.
In the case of an extruded sheath, the covering may fill the interstices between the cores but shall
not adhere to the cores. The core assembly may be surrounded by a separator tape, provided that it
does not adhere to the cores. Circular flexible cords shall have an acceptable circular cross-section
(see 4.4.4).
4.4.2 Thickness
Unless otherwise stated in clause 5, the nominal thickness of an extruded sheath shall be as given
in table 5, 8 or in table 9, as appropriate. When the average thickness of the sheath is determined in
accordance with 7.5.1, it shall be at least equal to the nominal value, and the minimum thickness at
any point shall be not less than the corresponding minimum value given in the tables.
4.4.3 Overall diameter limits
For a type of flexible cord covered by the specific requirements of clause 5, the mean overall
diameter, determined in accordance with 7.5.2, shall not exceed the upper limit appropriate to the
cable.
4.4.4 Ovality
For a circular flexible cord, the difference between any two values of the overall diameter of circular
sheathed cores at the same cross-section (the ovality), determined in accordance with 7.5.3, shall
not exceed 15 % of the upper limit appropriate to the cord.
4.5 Electrical requirements for finished flexible cords
4.5.1 Conductor resistance
When determined in accordance with 7.4.1, the d.c. resistance of each conductor shall not exceed
the appropriate maximum value given in SANS 1411-1.
4.5.2 Voltage withstand
When a flexible cord is tested in accordance with 7.4.2, each core of the flexible cord
shall withstand, for 5 min or 10 min, as relevant, without breakdown of the dielectric, a test voltage
of the appropriate value given in table 6.
4.5.3 Spark test
During manufacture, the core insulation shall have been continuously spark tested, using the
method given in SANS 62230 at an a.c. (r.m.s.) spark test voltage of 5 000 V without breakdown of
the dielectric. Alternatively, a d.c. spark test voltage of 7 500 V may be used.
6
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SANS 1574-2:2012
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4.6 Insulation resistance of PVC-insulated flexible cords
When a flexible cord is tested in accordance with 7.4.4, the resistance of the insulation of the
flexible cord shall be at least equal to the value given in the appropriate columns of table 4.
4.7 Electrical mechanical strength requirements
4.7.1 Flexing test
When a cord other than a single-core cord is tested in accordance with 7.6.1, no open circuit of any
conductor or short circuit between cores shall occur during flexing and no breakdown of insulation
shall occur when the cord is subsequently subjected to the voltage withstand test of 7.4.2.
4.7.2 Extension test for extensible leads
When an extensible lead is tested in accordance with 7.6.2, the coil shall return to 150 % (or less) of
its original coiled length within 30 s after the fifth extension.
4.7.3 Extensibility test for extensible leads
When an extensible lead is tested in accordance with 7.6.3, there shall be no electrical discontinuity
in any of the cores during the test and no breakdown of the insulation shall occur when the lead is
subsequently subjected to the withstand voltage test of 7.4.2.
Table 1 — Types of insulating material
1
2
3
Insulation
Types
Applicable specification
D2, D3, D4, D5, D6
SANS 1411-2
Thermoplastic, PVC based
Table 2 — Core identification
1
2
Cores
Colours
Single-core
Two core
Green/yellow, or other mono-coloursa
Blue, brown
Three-core (earthing type)
Three-core (non-earthing type)
Green/yellow, blue, brown
Blue, brown, black
Four-core (earthing type)
Four-core (non earthing type)
Green/yellow, black, blue, brown
Black, blue, brown, violet
Five-core (earthing type)
Five-core (non earthing type)
Green/yellow, blue, brown, black, violet
Blue, brown, black, violet, pink
Seven-core (earthing type)
Seven-core (non-earthing type)
Green/yellow, blue, brown, black, violet, pink, orange
Blue, brown, black, violet, pink, orange, turquoise
a
In addition to the combination green/yellow, the following other mono-colours are recognized: green,
yellow, black, blue, brown, grey, orange, pink, red, turquoise, violet and white.
7
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SANS 1574-2:2012
Edition 1
Table 3 — Types of protective covering
1
2
3
Covering
Type
Applicable specification
S3, S4, S5
SANS 1411-2
Thermoplastic, PVC based
Table 4 — Thickness and insulation resistance of PVC insulation
1
2
3
4
Thickness of
insulation
Conductor size
mm
5
Minimum
insulation
resistance
at 70 0C
mm
6
7
Thickness
of insulation
Minimum
insulation
resistance
0
at 70 C
mm
2
nom.
min.
nom.
mΩ.km
300/300 V
min.
mΩ.km
300/500V
0,50
0,75
0,5
0,5
0,35
0,35
0,012
0,011
0,6
0,6
0,44
0,44
0,012
0,011
1
1,5
2,5
-
-
-
0,6
0,7
0,8
0,44
0,53
0,62
0,010
0,010
0,009
Table 5 — Thickness of PVC sheathing of flexible cords
1
2
3
4
5
Conductor
size
mm²
6
7
8
9
10
11
Thickness
mm
2-core
Light duty
3-core
4-core
5-core
More than
5-core
nom.
min.
nom.
min.
nom.
min.
nom.
min.
nom.
min.
0,5
0,6
0,41
0,6
0,41
0,6
0,41
-
-
-
-
0,75
0,6
0,41
0,6
0,41
0,6
0,41
-
-
-
-
0,5
0,8
0,58
0,8
0,58
0,8
0,58
0,9
0,67
0,9
0,67
0,75
0,8
0,58
0,8
0,58
0,8
0,58
0,9
0,67
0,9
0,67
1,0
0,8
0,58
0,8
0,58
0,9
0,67
0,9
0,67
0,9
0,67
1,5
0,8
0,58
0,9
0,67
1,0
0,75
1,1
0,84
1,1
0,84
2,5
1,0
0,75
1,1
0,84
1,1
0,84
1,2
0,92
1,2
0,92
Normal duty
8
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SANS 1574-2:2012
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Table 6 — Test voltages
1
2
Rated
Voltage
3
10 min test
5
5 min test
Between
conductors
Between
conductors
and earth
Between
conductors
-
2000
-
2 000
2 000
V
300/300
300/500
4
2000
Between any
conductor
and
earth
2 000
5 Specific requirements for types of flexible cords in common use
5.1 General
The specific requirements for types of flexible cords in common use are as follows:
a) Type P1 :Normal duty, non-sheathed, 300/500V single core (H05V-F);
b) Type P3 :Light duty, sheathed, flat 300/300V (H03VVH2-F);
c) Type P5
Normal duty, sheathed, circular 300/500V (H05VV-F);
d) Type P7
:Light duty, sheathed, circular 300/300V (H03VV-F);
e) Type P10 :Normal duty, sheathed, flat 300/500V (H05VVH2-F);
f) Type P14 :Light duty extensible lead 300/300V (H03VVH8-F and H03VVH2H8-F); and
g) Type P15
:Normal duty extensible lead 300/500V (H05VVH8-F and H05VVH2H8-F).
5.2 Type P1 – Normal-duty, non-sheathed cord, 300/500 V single-core
harmonized code designation: H05V-F
NOTE It is customary to refer to the above as “flexible cables”, particularly when used in the context of
internal wiring.
5.2.1 Construction
The conductor(s) shall comply with the requirements for a class 5 conductor of SANS 1411-1. The
insulation shall comply with the requirements for type D3 insulation of SANS 1411-2. The cord shall
comply with the requirements of table 7.
5.2.2 Colours for core identification
Green/yellow, blue or other colours (see table 2 for recognized colours).
9
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Table 7 — Specific requirements for type P1 cords
1
Conductor size
2
3
Thickness of insulation
mm ²
0,5
0,75
1
mm
nom.
0,6
0,6
0,6
min.
0,44
0,44
0,44
4
Mean overall
diameter of each
core
(upper limit)
mm
5
Minimum
insulation
resistance at 70°C
2,6
2,8
3,0
0,012
0,011
0,010
mΩ.km
5.3 Type P3 and P7 – PVC insulated, PVC sheathed light duty cord, 300/300V
parallel 2 or 3 core, circular 2 core, 3 core and 4 core. Harmonized code
designations: Parallel flat cords: HO3VVH2-F (type P3) Circular cords:
HO3VV-F (type P7)
5.3.1 Construction
The conductor shall comply with the requirements for a class 5 conductor of SANS 1411-1.
The insulation shall comply with the requirements for type D3 of SANS 1411-2. A flat cord shall be
formed from two or three cores laid parallel and sheathed with PVC that complies with the
requirements for type S3 of SANS 1411-2.
A circular cord shall be formed from two, three or fours cores twisted together and sheathed with
PVC that complies with the requirements for type S3 of SANS 1411-2. The cords shall be of an
acceptably circular cross-section and a centre filler may be used where necessary. The sheath may
fill the interstices between the cores but shall not adhere to the cores. The assembly of cores may
be surrounded by a separator, provided that it does not adhere to the cores.
The cords shall comply with the requirements of table 8.
5.3.2 Colours for core identification
The following are the colours for core identification:
a) 2-core: blue and brown;
b) 3-core: green/yellow, blue and brown; and
c) 4-core: green/yellow, black, blue and brown.
10
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Table 8 — Specific requirements for type P3 or type P7 cords
1
Number of
cores and
conductor
size
2
3
Thickness of
insulation
mm²
4
5
Thickness of sheath
2 × 0,5
2 × 0,5
2 × 0,75
2 x 0,75
nom.
0,5
0,5
0,5
0,5
mm
min.
0,35
0,35
0,35
0,35
nom.
0,6
0,6
0,6
0,6
mm
min.
0,41
0,41
0,41
0,41
3 × 0,5
3 × 0,75
0,5
0,5
0,35
0,35
0,6
0,6
0,41
0,41
0,35
0,35
0,6
0,6
0,41
0,41
4 × 0,5
0,5
4 × 0,75
0,5
a
Indicative value only
6
7
Overall dimensional
limits
8
Minimum
insulation
resistance
at 70°C
mm
upper
3,7 × 5,9
5,9
3,8 × 6,3
6,3
0,012
0,012
0,011
0,011
4,9
5,2
6,3
6,3
0,012
0,011
5,6
6,0
6,8
7,4
0,012
0,011
lowera
3,0 × 4,9
4,6
3,2 × 5,2
4,9
mΩ.km
5.3 Type P5 and P10 – PVC-insulated, PVC-sheathed normal-duty cord,
300/500 V parallel 2 core, circular 2 core, 3 core, 4 core and 5 core.
Harmonized core designations: Flat cords: HO5VVH2-F (type P10). Circular
cords: HO5VV-F (type P5)
5.3.1 Construction
The conductor(s) shall comply with the requirements for a class 5 conductor of SANS 1411-1.
The insulation shall comply with the requirements for the type D3 of SANS 1411-2. A flat cord shall
be formed from two or three cores laid parallel and sheathed with PVC that complies with the
requirements for type S3 of SANS 1411-2.
A circular cord shall be formed from two, three or four cores twisted together and sheathed with
PVC that complies with the requirements for type S3 of SANS 1411-2. The cords shall be of an
acceptably circular cross-section and a centre filler may be used where necessary. The sheath may
fill the interstices between the cores but shall not adhere to the cores. The assembly of cores may
be surrounded by a separator, provided that it does not adhere to the cores.
The cord shall comply with the requirements of table 9.
5.3.2 Colours for core identification
The following are the colours for core identification:
a) 2-core: blue and brown;
b) 3-core: green/yellow, blue and brown;
c) 4-core: green/yellow, black, blue and brown; and
d) 5-core: green/yellow, black, blue, brown and violet.
11
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Table 9 — Specific requirements for type P5 and type P10 cords
1
Number of
cores and
conductor
size
mm²
2
3
Thickness of
insulation
mm
min.
0,44
0,44
0,44
0,44
0,44
0,53
0,62
4
5
Thickness of sheath
8
Minimum
insulation
resistance
at 70°C
mΩ.km
mm
min.
0,58
0,58
0,58
0,58
0,58
0,58
0,75
lowera
5,6
3,7 × 6,0
5,7
3,9 × 6,4
5,9
6,8
8,4
mm
upper
7,0
4,5 × 7,2
7,2
5,2 × 8,0
7,5
8,6
10,6
0,012
0,011
0,011
0,010
0,010
0,010
0,009
2 × 0,5
2 × 0,75
2 × 0,75
2×1
2 ×1
2 × 1,5
2 × 2,5
nom.
0,6
0,6
0,6
0,6
0,6
0,7
0,8
3 × 0,5
3 × 0,75
3 × 0,75
3×1
3×1
3 × 1,5
3 ×2,5
0,6
0,6
0,6
0,6
0,6
0,7
0,8
0,44
0,44
0,44
0,44
0,44
0,53
0,62
0,8
0,8
0,8
0,8
0,8
0,9
1,1
0,58
0,58
0,58
0,58
0,58
0,67
0,84
5,8
3,7 × 8,3
6,0
3,9 ×8,9
6,3
7,4
9,2
7,2
4,5 × 9,5
7,6
5,2 ×10,5
8,0
9,4
11,4
0,012
0,011
0,011
0,010
0,010
0,010
0,009
4 × 0,5
4 × 0,75
4×1
4 × 1,5
4 × 2,5
0,6
0,6
0,6
0,7
0,8
0,44
0,44
0,44
0,53
0,62
0,8
0,8
0,9
1,0
1,1
0,58
0,58
0,67
0,75
0,84
6,6
6,9
7,1
8,4
10,1
8,3
8,6
9,0
10,5
12,5
0,012
0,011
0,010
0,010
0,009
0,44
0,44
0,44
0,53
0,62
0,9
0,9
0,9
1,1
1,2
0,67
0,67
0,67
0,84
0,92
7,0
7,4
7,8
9,3
11,2
8,9
9,3
9,8
11,6
13,9
0,011
0,011
0,010
0,010
0,009
0,6
5 × 0,5
0,6
5 × 0,75
0,6
5×1
0,7
5 × 1,5
0,8
5 × 2,5
a
Indicative value only
nom.
0,8
0,8
0,8
0,8
0,8
0,8
1,0
6
7
Overall dimensional
limits
5.4 Type P14 – PVC insulated and sheathed light duty extensible lead,
300/300 V 2 core and 3 core. Harmonized code designation: HO3VVH8-F
(circular P7), HO3VVH2H8-F (flat P3)
Prior to being coiled into extensible leads, the cords shall comply with the requirements for 2 core or
3 core type P3 (flat) or type P7 (circular) flexible cords. The cord shall be coiled to produce a helical
lead (see figure 1) that will substantially maintain its form during use. The minimum internal
diameter of the coiled lead shall comply with table 10.
12
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SANS 1574-2:2012
Edition 1
Drg.399
Figure 1 — Typical 2-core extensible lead
Table 10 — Minimum internal diameter of extensible leads
1
2
Maximum overall cord diameter
Minimum internal diameter of completed coil
mm
Up to 8,0
8,1 to 11,0
mm
8,0
12,0
NOTE The length of the straight section of each end of the lead should be sufficient to allow at least
one rewiring operation.
5.5 Type P15 – PVC insulated and sheathed normal duty extensible lead,
300/500V, 2 core and 3 core. Harmonized code designation: HO5VVH8-F
(circular P5) HO5VVH2H8-F (flat P10)
Prior to being coiled into extensible leads, the cords shall comply with the requirements of 2 core or
3 core type P5 (circular) or P10 (flat) flexible cords of 0,75 mm², 1,0 mm² or 1,5 mm² conductor size.
The cords shall be coiled to produce a helical lead (see figure 1) that will substantially maintain its
form during use.
The minimum internal diameter of the coiled lead shall comply with the requirements of table 10.
13
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SANS 1574-2:2012
Edition 1
6. Packing and marking
6.1 Packing
Flexible cables shall be packed on reels or in coils.
6.2 Marking of flexible cords
6.2.1 Indication of origin
All flexible cords shall be provided with an indication of origin consisting either of an identification
thread or threads or the continuous legible marking of the manufacturer's name or trademark.
The marking shall be regarded as continuous if the gap between the end of one complete
inscription and the beginning of the next does not exceed:
– 550 mm if the marking is on the sheath, and
– 275 mm in all other cases.
– if coloured threads are used, the colours shall comply with those registered with the SABS,
where applicable. The colours shall be easy to recognize or shall become recognizable by
cleaning, if necessary, with petrol or other suitable solvent. The marking of the
manufacturer's name or trademark, if used, shall be one of the three following alternative
methods:
– printed tape within the cable;
–
printing, indenting or embossing on the insulation of at least one core (the core coloured
blue, if there is one); or
– printing, indenting or embossing on the sheath, if there is one.
6.2.2 Marking of reels and coils
Each reel or coil package shall bear the following information in legible and indelible marking:
a) the manufacturer's trade name or trademark (or both);
b) the rated voltage, the rated current, the conductor size of phase conductor(s), the number of
cores, and the type identification;
c) the length of cable; and
d) when applicable, any special properties.
7 Inspection and methods of test
NOTE Annex B gives the guidelines for the use of insulated flexible cables.
7.1 Inspection
Visually inspect and then measure each specimen in the sample for compliance with all the relevant
requirements of this standard for which tests to assess compliance are not given in 7.4 to 7.6
(inclusive).
14
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SANS 1574-2:2012
Edition 1
7.2 Methods of test
For convenience, the properties to be tested, the test category, the test methods and the subclause
giving the requirements are listed in table 11.
Table 11 — List of tests to be conducted
1
2
3
4
5
Component(s)
Test property
Test
category
Test method
Requirement
subsection
Conductor
Construction
S
SANS 1411-1
4.2.1
Insulation
Physical properties
S
SANS 1411-2
4.2.2.1
Thickness
Spark test
Core identification
Assembly of cores
R
R
R, S
R, S
7.5.1 (SANS 60811-1-1)
SANS 62230
Visual examination
Visual examination
4.2.2.3
4.2.2.4
4.3
4.3.4
Physical properties
S
SANS 1411-2
4.4.3.1
Thickness
R
7.5.1 (SANS 60811-1-1)
4.4.3.2
Marking
Conductor resistance
Voltage withstand
Insulation resistance
R
S
S
S
Visual examination
7.4.1 (SANS 6282-1)
7.4.2 (SANS 6284-3)
7.4.4 (SANS 5526)
6.2
4.5.1
4.5.2
4.6
Overall diameter
Ovality
Flexing test
Extension test (extensible
leads)
Extensibility test
(extensible leads
S
S
T
S
7.5.2 (SANS 6284-3)
7.5.3 (SANS 6284-3)
7.6.1 (SANS 5515)
7.6.2 (SANS 6208)
4.4.3.3
4.4.3.4
4.7.1
4.7.2
T
7.6.3 (SANS 6205)
4.7.3
Sheath
Finished
flexible cable
NOTE
In column 3 of this table, a code letter is given that identifies the tests as suitable for use as routine tests (R),
sample tests (S) or type tests (T), but compliance with the requirements of the standard may only be fully
determined from the results of tests carried out on sample of completed cable(s), using all the test methods
given and a sampling procedure agreed upon. During production control, a manufacturer may use any tests
that he deems necessary to ensure compliance with the standard but, in the case of a dispute, only the
appropriate standard test methods may be used.
7.3 Conditions of test
The following conditions of test shall apply:
a) unless otherwise stated in the method of test, all tests shall be carried out at ambient
temperature and pressure; and
b) unless otherwise specified in the method of test, the frequency of the alternating test voltage
used shall be approximately 50 Hz, and the waveform shall be substantially sinusoidal.
15
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SANS 1574-2:2012
Edition 1
7.4 Electrical tests
7.4.1 Conductor resistance
Use SANS 6282-1.
7.4.2 Voltage withstand
Use SANS 6284-3
7.4.3 Spark test
Use SANS 62230.
7.4.4 Insulation resistance
Use SANS 5526.
7.5 Dimensional tests
7.5.1 Thickness of insulation and sheath
Use SANS 60811-1-1.
7.5.2 Overall diameter
Use SANS 6284-3.
7.5.3 Ovality
Use SANS 6284-3.
7.6 Mechanical tests on completed flexible cords
7.6.1 Flexing test
Use SANS 5515 and conduct the test for 15 000 cycles, a cycle being on movement in each
direction.
7.6.2 Extension test for extensible leads
Use SANS 6208.
7.6.3 Extensibility test for extensible leads
Use SANS 6205.
16
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SANS 1574-2:2012
Edition 1
Annex A
(informative)
System for designation of harmonized cables and cords
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SANS 1574-2:2012
Edition 1
Annex B
(informative)
Guide to the use of insulated flexible cables
Details given in this annex are intended only as general technical guidance and not as an
interpretation of any South African statutory requirements, where these apply.
B.1 General
B.1.1 Flexible cables are not intended to be laid underground.
B.1.2 Cables of undue length are not recommended.
B.1.3 Where cables are to be used in ambient temperatures below 0 °C, the manufacturer should
be consulted.
B.2 Temperatures and current ratings
B.2.1 The cables are suitable for use where the combination of ambient temperature and
temperature rise due to load results in a conductor temperature does not exceed:
a) 70 °C for types D3 and D6 PVC insulation;
b) 90 °C for types D4 PVC insulation; and
c) 105 °C for types D5 PVC insulation;
B.2.2 The maximum continuous currently ratings of these tables are tabulated in table B.1 below.
Table B.1 — The maximum continuous current ratings
of insulated flexible cables
1
2
3
Conductor size
mm2
Single phase A
Three phase A
0,5
3
3
0,75
6
6
1,0
10
10
1,5
16
16
2,5
25
20
These maximum continuous current ratings apply to the majority of cases in ambient temperature of
30 °C. Further information should be sought from the manufacturer in unusual cases, for example:
a) where high ambient temperatures are involved, i.e. above 30 °C;
b) where long lengths are used;
18
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SANS 1574-2:2012
Edition 1
c) where ventilation is restricted; or
d) where the cables are used for purposes such as the internal wiring of apparatus.
B.2.3 In case of short circuit, the maximum conductor temperature (maximum duration 5 s) should
not exceed:
160 °C for PVC insulation.
NOTE
The short circuit temperature is based on the intrinsic properties of the insulation material. It is
essential that the accessories that are used in the system with mechanical or soldered connections (or with
both) are suitable for the temperature adopted for the flexible cord.
B.2.4 Table B.2 below gives the guidelines to the use of insulated flexible cords
Table B.2 — Guide to the use of insulated flexible cords
1
2
3
Type ref.
Type and use
Comments
P1
PVC-Insulated
Non-sheathed (internal wiring)
Fixed protected installation inside
appliances or on lighting fittings (or both)
P3 , P7
P5, P10
Suitable for installations in surfacemounted or embedded conduits,
only for signalling or control circuits.
Light PVC-sheathed
In domestic premises, kitchens, offices; for
light duties for light portable appliances.
Not suitable for cooking or spaceheating appliances. Not suitable for
outdoor use in industrial or
agricultural buildings or for supplying
non-domestic portable tools.
For cords of 0,75 mm² conductor size, the
same use and comments for the ordinary
PVC-sheathed cord below are applicable.
Cords of 0,5 mm² conductor size are
suitable for small hand-held
appliances (except those
incorporating heated parts) when
specified by the relevant appliance
standard
Where extra flexibility is required and
provided there is no particular danger of
damage, light PVC-sheathed cords may be
used.
For applications subject to frequent
flexing or torsion (or both), circular
twin cords are recommended instead
of flat cords
Ordinary PVC-sheathed
In domestic premises, kitchens, offices; for
household appliances, including damp
situations, for medium duties (e.g.
machines, spin dries and refrigerators)
Suitable for cooking and heating
appliances, provided that there is no
risk of contact with hot parts and that
the appliance is not subject to
radiation, etc.
19
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SANS 1574-2:2012
Edition 1
Bibliography
SANS 1574-3, Electric flexible cables with solid extruded electric insulation – Part 3: PVC-insulated
cores and cables.
© SABS
20
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