1 Scope
Modification of the Clause 1 to replace with the following:
1.1 This
part of IEC 60079
standard
gives requirements for the design, construction, assessment, verification and marking of rooms used to protect internal equipment:
–
a
located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere (an area normally requiring an equipment protection level (EPL) Gb, Gc, Db or Dc) without an internal source of gas/vapour release and protected by pressurization;
–
b
located in a Zone 2 explosive atmosphere (an area normally requiring EPL Gc) with or without an internal source of gas/vapour release and protected by artificial ventilation;
–
c
located in a non-hazardous area, containing an internal source of gas/vapour release and protected by artificial ventilation;
–
d
located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere (an area normally requiring EPL Gb, Gc, Db or Dc), containing an internal source of gas/vapour release and protected by both pressurization and artificial ventilation. The use of Type of Protection "v" is not permitted to be used as the type of protection for a room containing an internal source of release if this same room has already been classified using mechanical or artificial ventilation in accordance with API RP 505, NFPA 497 or ISA 60079-10-1 as applicable. This is because such a use would rely upon the same concept for two independent safety functions. However, for a larger room containing an internal source of release that has been classified using mechanical or artificial ventilation in accordance with API 505, NFPA 497 or ISA 60079-10-1 as applicable, another smaller room containing its own internal source of release may be included within the larger room that does utilize Type of Protection "v" (referred to as "a room within a room").
NOTE An example of an application where Type of Protection "v" is not permitted is a room containing an internal source of release classified as Zone 2 using mechanical or artificial ventilation, and the installation of ignition capable equipment within the same room is based on the addition of another ventilation source with associated safety devices.
1.2 DE The term "room" used in this document includes single rooms, multiple rooms, a complete building or a room contained within a building. A room is intended to facilitate the entry of personnel
.
and
The term "room" also
includes inlet and outlet ducts. An acoustic hood and other like enclosures designed to permit the entry of personnel can be considered as a room. This document also includes requirements related safety devices and controls necessary to ensure that artificial ventilation, purging and pressurization is established and maintained.
A room assembled or constructed on site, can be either on land or off-shore. The room is primarily intended for installation by an end-user but could be constructed and assessed at a manufacturer’s facility, where the final construction such as ducting can be completed on site.
Rooms can be located in an explosive gas atmosphere requiring EPL Gb or Gc, or a combustible dust atmosphere requiring EPL Db, or Dc.
This document does not specify the methods that may be required to ensure adequate air quality for personnel with regard to toxicity and temperature within the room. National or other regulations and requirements may exist to ensure the safety of personnel in this regard.
1.3 DR Protection of rooms by using an inert gas or a flammable gas is outside of the scope of this document. It is recognized that such applications are special cases, which in part may be addressed using the principles from
IEC
UL
60079-2, but in all probability will also be the subject of additional, stringent engineering standards, procedures and practices. Pressurized enclosures for equipment that are not intended to facilitate the entry of personnel are addressed in IEC
UL
60079-2, and are not in the scope of this document. DR NOTE Maintenance recommendations are contained in Annex A
until they can be included in IEC 60079-17
.
1.4 DR This document supplements and modifies the general requirements of
IEC
UL
60079-0, except exclusions as indicated in . Where a requirement of this document conflicts with a requirement of IEC
UL
60079-0, the requirement of this document takes precedence.
1.5 DR Where references are made to IEC and ISO standards, the referenced requirements found in these standards shall apply as modified by any applicable US National Differences for the standard (see Clause 2).
Modification of Table 1DV.1 with the following:
Table 1DV.1 Exclusion of specific clauses or subclauses of <p>IEC</p><p>UL</p> 60079-0
Clause of
IEC
UL
60079-0
IEC
UL
60079-0 application to IEC
UL
60079-13
Ed. 6.0
(
2011
2013
) (Informative)
Clause / subclause title
(Normative)
4
Equipment grouping
Applies
4.1
Group I
Excluded
4.2
Group II
Applies
4.3
Group III
Applies
4.4
Equipment for a particular explosive atmosphere
Applies
5.1
Environmental influences
Applies
5.1.1
Ambient temperature
Applies
5.1.2
External source of heating or cooling
Applies
5.2
Service temperature
Applies
5.3.1
Determination of maximum surface temperature
Applies
5.3.2.1
Group I electrical equipment
Excluded
5.3.2.2
Group II electrical equipment
Applies
5.3.2.3
Group III electrical equipment
Applies
5.3.3
Small component temperature for Group I and Group II electrical equipment
Excluded
6.1
General
Applies
6.2
Mechanical strength
Excluded
6.3
Opening times
Excluded
6.4
Circulating currents
Excluded
6.5
Gasket retention
Excluded
6.6
Electromagnetic and ultrasonic radiating equipment
Applies
7.1
General
Excluded
7.2
Thermal endurance
Excluded
7.3
Resistance to light
Modified
7.4
Electrostatic charges on external non-metallic materials
Excluded
7.5
Accessible metal parts
Excluded
8
Metallic enclosures and metallic parts of enclosures
Excluded
9
Fasteners
Excluded
10
Interlocking devices
Excluded
11
Bushings
Excluded
12
Materials used for cementing
Excluded
13
Ex components
Excluded
14
Connection facilities and termination compartments
Excluded
15
Connection facilities for earthing and bonding conductors
Excluded
16
Entries into enclosures
Excluded
17
Supplementary requirements for rotating electrical machines
Excluded
18
Supplementary requirements for switchgear
Excluded
19
Supplementary requirements for fuses
Excluded
20
Supplementary requirements for plugs and sockets
Excluded
21
Supplementary requirements for luminaires
Excluded
22
Supplementary requirements for caplights and handlights
Excluded
23
Equipment incorporating cells and batteries
Excluded
24
Documentation
Applies
25
Compliance of prototype or sample with documents
Applies
26.1
General
Applies
26.2
Test configuration
Applies
26.3
Tests in explosive test mixtures
Excluded
26.4
Tests of enclosures
Excluded
26.5
Thermal tests
Excluded
26.6
Torque test for bushings
Excluded
26.7
Non-metallic enclosures or non-metallic parts of enclosures
Excluded
26.8
Thermal endurance to heat
Excluded
26.9
Thermal endurance to cold
Excluded
26.10
Resistance to light
Applies
26.11
Resistance to chemical agents for Group I electrical equipment
Excluded
26.12
Earth continuity
Excluded
26.13
Surface resistance test of parts of enclosures of non-metallic materials
Excluded
26.14
Measurement of capacitance
Excluded
26.15
Verification of ratings of ventilating fans
Excluded
26.16
Alternative qualification of elastomeric sealing O-rings
Excluded
27
Routine tests
Applies
28
Manufacturers responsibility
Applies
29.1
Applicability
Applies
29.2
Location
Modified
29.3
General
Modified
29.4
Ex marking for explosive gas atmospheres
Modified
29.5
Ex marking for explosive dust atmospheres
Applies
29.6
Combined types of protection
Applies
29.7
Multiple types of protection
Excluded
29.8
Ga using two independent Gb types of protection
Excluded
29.9
Ex components
Excluded
29.10
Small equipment and small Ex components
Excluded
29.11
Extremely small equipment and extremely small Ex components
Modified
29.12
Warning markings
Applies
29.13
Alternate marking of equipment protection levels (EPLs)
Excluded
29.14
Cells and batteries
Applies
30
Instructions
Modified
Annex A
Supplementary requirements for Ex cable glands
Excluded
Annex B
Requirements for Ex components
Excluded
Annex C
Example of rig for resistance to impact test
Excluded
Annex D
Introduction to an alternative risk assessment method encompassing "equipment protection levels" for Ex equipment
Applies
Applies: this requirement of
IEC
UL
60079-0 is applied without change.
Excluded: this requirement of
IEC
UL
60079-0 does not apply.
Modified: this requirement of
IEC
UL
60079-0 is modified as detailed in this document.
NOTE The applicable requirements of
IEC
UL
60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of IEC
UL
60079-0, Ed 6.0.