ShiRong Xiang, ABB Australia, BU Motors and Generators, PG Large AC Motor
Ex world
Today and Tomorrow
© ABB Group
November 14, 2014 | Slide 1
INDEX
•
Standards
•
IEC and EN
•
© ABB BU Motors & Generators
•
EN standard and ATEX directives
•
IEC standard
•
EN vs IEC
•
IEC vs IEC Ex
•
EPL
•
Markings
CSA and CEC
•
NEC 500
•
NEC 505
•
Markings
•
What is appening in the future
•
Variable Speed Drive motors
World of standards
CEC, CSA
ATEX
TRCU
STB
TRCU
ATEX (Europe)
NEC,
CSA/US/UL
JIS
CNEx
Korean Std
CCoE
Inmetro
ANZEx
SABS
IECEx (worldwide)
© ABB BU Motors and Generators
November 14, 2014 | Slide 3
Standards
© ABB BU Motors and Generators
November 14, 2014 | Slide 4
Certification
Standard
ATEX
EN
IEC
IEC
IECEx System
IEC
American System
CSA, UL
CSA, UL
NEC/CE code 500/505
EN standards – latest revisions
All technical requirements are based on EN standards, refer
corresponding IEC standards (latest harmonized edition)
© ABB BU Motors and Generators
November 14, 2014 | Slide 5
EN 60079-0, 08-2012 (2009, 2012)
General requirements
EN 60079-2, 11-2007 (2007)
Flameproof enclosures “p”
EN 60079-1, 07-2007 (2007)
Flameproof enclosures “d”
EN 60079-7, 01-2007 (2007)
Increased safety “e”
EN 60079-15, 05-2010 (2010)
Type of protection “n”
EN 60079-31, 07-2014 (2009)
Type of protection “t”
ATEX Directive
Products Directive ATEX Concentrates on the duties of
the manufacturers.
Defines the Essential Health & Safety Requirements
(EHSRs) applicable to equipment, such as motors, to be
used in potentially explosive atmospheres containing
gas or combustible dust.
Ex equipment's intended for use in EU Countries shall
be certified according the ATEX Directive 94/9/EC
The main mechanical and electrical design of the
machine fulfils EN standards.
© ABB BU Motors and Generators
November 14, 2014 | Slide 6
IEC standards – latest revisions
All technical requirements are based on IEC standards
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November 14, 2014 | Slide 7
IEC 60079-0, 06-2011
General requirements
IEC 60079-2, 07-2014
Flameproof enclosures “p”
IEC 60079-1, 06-2014
Flameproof enclosures “d”
IEC 60079-7, 07-2006
Increased safety “e”
IEC 60079-15, 01-2010
Type of protection “n”
IEC 60079-31, 11-2013
Type of protection “t”
IEC and IECEx System
IEC = International Electrotechnical Commission
IEC is a non-profit, non-governmental international standards
organization that prepares and publishes International
Standards for all electrical, electronic and related technologies.
IECEx = IEC System for Certification to Standards relating to
Equipment for use in Explosive Atmospheres
The objective of the IECEx System is to facilitate international trade in
equipment and services for use in explosive atmospheres, while
maintaining the required level of safety.
IECEx System is an international conformity assessment system
for Ex equipment, installations, area classifications, repair shops
and persons
The IECEx System is based on the use of specific international
IEC Standards for type of protection of Ex equipment.
IECEx System includes additions to the certification system
compared to IEC. These modifications do not include the product
itself, but the process (quality, procedures, documentation…)
IECEx is internationally recognized by all certification laboratories
Differences between IEC and IEC-Ex scheme
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November 14, 2014 | Slide 9
IEC versus EN standards
Agreement between IEC and CENELEC (ATEX, EN standards) of common
planning of new work and parallel voting, Called “Dresden agreement”, done in
Sept.1996
IEC or CENELEC proposes new version or new standard
IEC prepares the draft of the new version or standard
IEC sends the final draft for parallel voting to
IEC members
CENELEC National Committees
In case both voting results are positive, the draft will be ratified as an
IEC standard
EN standard
IEC standard is based on worldwide consensus and is a recommendation
only
EN standard is based on European consensus and each member state
must implement it as a binding national standard
© ABB BU Motors and Generators
November 14, 2014 | Slide 10
IEC and EN standards
Determination of Zones
Zone 0 – permanent presence of explosive atmosphere (>1000 hrs/year)
Zone 1 – incidental presence of explosive atmosphere (10-1000 hrs/year)
Zone 2 - presence of explosive atmosphere only by accident (<=10 hrs/year
Apparatus groups
Group I - mines susceptible to firedamp
Group II – areas with gas
•
Group III – areas with dusts
Gas group
•
Dust group
IIIA (combustible flyings, eg.
fibers)
IIA (e.g. Propane)
IIB (e.g. Ethylene)
IIIB (non-conductive dust)
IIC (e.g. Acetylene and Hydrogen)
•
Temperature classes
IIIC (conductive dust)
T1
T2
T3
T4
T5
T6
450C
300 C
200 C
135 C
100 C
85 C
T1……T6
© ABB BU Motors and Generators
November 14, 2014 | Slide 11
Equipment Protection Levels (EPL)
EPL
Definition
Relationship to
Zones
Ga (gas)
Equipment having a ”very high” (a) level
of protection, e.g. ”ia”
0
Gb (gas)
Equipment having a ” high” (b) level of
protection, e.g.”ib”, ”d”, ”p”, ”e”,(”de”)
1
Gc (gas)
Equipment having an ”enhanced ” (c)
level of protection, e.g. ”ic”,”nA”
2
Da (dust)
Equipment having a ”very high” (a) level
of protection, e.g. ”ta”
20
Db (dust)
Equipment having a ” high” (b) level of
protection, e.g. ”tb”
21
Dc (dust)
Equipment having an ”enhanced” (c)
level of protection, e.g. ”tc”
22
© ABB BU Motors and Generators
November 14, 2014 | Slide 12
Marking (IEC) gas
Ex nA II C T3 Gc
Ex - Explosion protected apparatus
nA - Type of Protection “nA”
II – group for gas
C – gas group
Temperature class
New protection level marking for gas,
c = enhanced level of protection
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November 14, 2014 | Slide 13
Marking (ATEX, EN) gas
Marking according to ATEX-directive
II 3 G
0537
for Gas
Equipment category (Zone 2)
Equipment group for surface industry
Use in explosive atmosphere
Notified body eg. 0537 - VTT
CE-marking
Standard marking
according to EN-standards
Ex - Explosion protected apparatus
Type of Protection
II - Group (gas)
A, B, C - Gas groups
Temperature class
Equipment protection level for gas
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November 14, 2014 | Slide 14
Ex nA II C T3 Gc
Marking (IEC) dust
Ex tc III B T125ºC Dc
Ex - Explosion protected apparatus
tc - Type of Protection “tc”
III – new group for dusts
B – new group for non-conductive dust
Temperature class
New protection level marking for dust,
c = enhanced level of protection
© ABB BU Motors and Generators
November 14, 2014 | Slide 15
Marking (ATEX, EN) dust
Marking according to ATEX-directive
0537
II 3 D
for Dust
Equipment category (Zone 22)
Equipment group for surface industry
Use in explosive atmosphere
Notified body eg. 0537 - VTT
CE-marking
Standard marking
according to EN-standards
Ex - Explosion protected apparatus
Type of Protection “t” for dust and protection level “c”
III - Group (dust)
A, B, C - Dust groups
Temperature class
Equipment protection level for dust
© ABB BU Motors and Generators
November 14, 2014 | Slide 16
Ex tc III B T125°C Dc
NEC / CE Code standards
Electrical equipment's intended for use in US and/or
Canadian markets shall be certified according the the
requirements of National Electric Code (NEC) and/or
Canadian Electric Code (CE Code)
The main mechanical and electrical design of the
machine fulfils NEMA standard.
When the main design completes North American
standards, the Ex-protection and area classification can
be nowadays made according to two different systems:
Traditional Division system or
New Zone system (refers to IEC standards)
© ABB BU Motors and Generators
November 14, 2014 | Slide 17
National Electrical Code (NEC) / Canadian Electrical
Code (CEC), NEC Article 500
Incidence of explosive material
Division 1
Occasionally or continuously
Division 2
In abnormal conditions
Division 1
Occasionally or
continuously
Explosive material
Class I
Gases
Class II
Dust
Class III
Fibers
Division 2
in abnormal conditions
Class 1 - Gas Groups
A
B
C
D
e.g. Gas
Acetylen
Hydrogen
Ethylene
Methane
Class 2 - Dust Groups
E
F
G
Temperature limit
e.g. Dust Normal Operation Abnormal Operation
Metal dust
200ºC
200ºC
Coal dust
150ºC
200ºC
Grain dust
120ºC
165ºC
© ABB Group
November 14, 2014 | Slide 18
Tclass Temp. /C
T1
450
T2
300
T2A
280
T2B
260
T2C
230
T2D
215
T3
200
T3A
180
T3B
165
T3C
160
T4
135
T4A
120
T5
100
T6
85
Marking NEC / CEC (NEC Article 500, old way)
Gases
Class I Div 2 Group D T2C
Explosive material
Incidence of explosive material
Gas group
Temperature class
Dust
Explosive material
Incidence of explosive material
Dust group and temperature class
Temperature class
© ABB Group
November 14, 2014 | Slide 19
Class II Div 2 Group F T120°C
Marking NEC / CEC (NEC Article 505, new way)
Class I
Gases - NEC
Zone 2
AEx nA IIC T3
Explosive material
Incidence of explosive material
"American Ex”, type of protection and apparatus group
Temperature class
Gases - CEC
Markings are similar as IEC markings, but CEC
recognize more temperature classes
Dust - NEC
Class II Zone 22 AEx tD A22 IP55 T120°C
Explosive material
Incidence of explosive material
”American Ex” IEC type marking
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November 14, 2014 | Slide 20
Class I Zone 2 Ex nA IIC T2B
NEC / CE Code standards
NEC division system compared to IEC zone system.
IEC Zones compared with
NEC Divisions
Zone 0
Zone 1
Div. 1
NEC 500 division system
Zone 2
Div. 2
IEC zone system
(NEC 505 zone system = IEC zone system)
© ABB BU Motors and Generators
November 14, 2014 | Slide 21
NEC / CE Code standards
NEC division system compared to IEC zone system.
Gas Group
IEC
NEC 505
NEC 500
II A
Group D
II B
Group C
Group B
IIC
Group A
© ABB BU Motors and Generators
November 14, 2014 | Slide 22
NEC / CE Code standards
NEC division system compared to IEC zone system.
Temperature class
IEC
NEC 500
Temp.
T1
T1
450 ºC
T2
T2
300 ºC
-
T2A
280 ºC
-
T2B
260 ºC
-
T2C
230 ºC
-
T2D
215 ºC
T3
T3
200 ºC
-
T3A
180 ºC
-
T3B
165 ºC
-
T3C
160 ºC
T4
T4
135 ºC
-
T4A
120 ºC
T5
T5
100 ºC
T6
T6
85 ºC
NEC 505
© ABB BU Motors and Generators
November 14, 2014 | Slide 23
What’s going to happen next
Protection type Ex nA motor requirements on standard
IEC 60079-15 will be moved to standard IEC 60079-7
Ex e
Marking will be changed after that
Ex nA > Ex ec
Ex e > Ex eb
New ATEX Directive 2014/34/EU
References to new Directive after 20.4.2016
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November 14, 2014 | Slide 24
Ex motors driven by Variable Speed Drives
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November 14, 2014 | Slide 25
Motor protection
Combined test motor + converter
Exd
Type test for the motor supplied at
varying frequency and voltage by a
converter is not mandatory.
Exp
Certification can be based on type test
results or calculation results
Exe
Ex e motor must be type tested and
certified in conjunction with each VSD
used to drive it.
Exn
Class I division 2
Class I zone 2
Certification can be based on type test
results or calculation results
Differences between Expx and Expz
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November 14, 2014 | Slide 26
Ex pz
Ex px
Overpressure
25 Pa
50 Pa
Inner parts
temperature in
T-class during
operation
No
Yes
Inner parts
temperature in
T-class during
start
No
No
Inner parts
temperature in
T-class during
stall
No
No
Differences between IEC 60079-15 2005 and 2010
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November 14, 2014 | Slide 27
2005
2015
Gas test on Stator
Not mandatory
Mandatory
Gas test on Rotor
Not mandatory
Not required for S1,
S2 and frequency
converter driven.
Pre-start purging
If risk assessment is Not required if S1 or
exceeded unless
S2 or vsd; it is at
gas test on rotor and customer discretion
stator are passed.
Questions
© ABB BU Motors and Generators
November 14, 2014 | Slide 28