BS EN 60079-35-1:2011

This standard BS EN 60079-35-1:2011 Household and similar electrical appliances - Safety is classified in these ICS categories:

• 97.180 Miscellaneous domestic and commercial equipment
• 97.200.40 Playgrounds
• 29.260.20 Electrical apparatus for explosive atmospheres

This part of IEC 60079-35 specifies requirements for the construction, testing and marking of caplights, including caplights with a point of connection for other equipment, for use in mines susceptible to firedamp (Group I – electrical equipment for explosive gas atmospheres as defined in IEC 60079-0). It deals only with the risk of the caplight becoming a source of ignition.

The requirements for performance are in IEC 60079-35-2.¹

This standard supplements and modifies the general requirements of IEC 60079-0 except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard take precedence.

Compliance with this standard will provide an EPL of Mb (see 4.1 of this standard). If an EPL of Ma is required, the caplight will need to conform to the requirements of 4.2 of this standard, which in turn refers to IEC 60079-11.

It is expected that from time to time, caplights conforming to this standard (EPL Mb) will operate in atmospheres where the firedamp exceeds statutory levels that require the withdrawal of people from the high firedamp atmosphere to a non-hazardous area.

In designing equipment for operation in conditions other than those given above, this standard may be used as guidance; however, additional testing may be required.

Where a caplight is assessed as intrinsically safe equipment, Ex ia, conforming to IEC 60079-11 only the clauses/subclauses listed in 4.2 require application.

Table 1 – Application or exclusion of specific clauses of IEC 60079-0

Clause of IEC 60079-0			IEC 60079-0 clause application
Ed. 5.0a (2007)	Ed. 6.0a (2011)	Clause/subclause title (normative)
1	1	Scope	Applies
2	2	Normative references	Applies
3	3	Terms and definitions	Applies
4	4	Equipment grouping	Applies
5	5	Temperatures	Applies
6.1	6.1	Requirements for all equipment – General	Applies
6.2	6.2	Requirements for all equipment – Mechanical strength of equipment	Applies
6.3	6.3	Requirements for all equipment – Opening times	Excluded
6.4	6.4	Requirements for all equipment – Circulating currents	Excluded
6.5	6.5	Requirements for all equipment – Gasket retention	Applies
6.6	6.6	Requirements for all equipment – Electromagnetic and ultrasonic energy radiating equipment	Applies
7	7	Non-metallic enclosures and non-metallic parts of enclosures	Applies
8	8	Metallic enclosures and metallic parts of enclosures	Applies
9	9	Fasteners	Applies
10	10	Interlocking devices	Applies
11	11	Bushings	Excluded
12	12	Materials used for cementing	Applies
13	13	Ex components	Applies
14	14	Connection facilities and terminal compartments	Applies
15	15	Connection facilities for earthing or bonding conductors	Excluded
16	16	Entries into enclosures	Applies
17	17	Supplementary requirements for rotating electrical machines	Excluded
18	18	Supplementary requirements for switchgear	Excluded
19	19	Supplementary requirements for fuses	Excluded
20	20	Supplementary requirements for plugs and socket outlets and connectors	Applies
21	21	Supplementary requirements for luminaires	Excluded
22	22	Supplementary requirements for caplights and handlights	Applies
23	23	Equipment incorporating cells and batteries	Modified
24	24	Documentation	Applies
25	25	Compliance of prototype or sample with documents	Applies
26.1	26.1	Type tests – General	Applies
26.2	26.2	Type tests – Test configuration	Applies
26.3	26.3	Type tests – Tests in explosive test mixtures	Applies
26.4	26.4	Type tests – Tests of enclosures	Modified
26.5.1	26.5.1	Thermal tests – Temperature measurement	Applies
26.5.2	26.5.2	Thermal tests – Thermal shock test	Applies
26.5.3	26.5.3	Thermal tests – Small component ignition test	Applies
26.6	26.6	Torque tests for bushings	Excluded
26.7	26.7	Non-metallic enclosures or non-metallic parts of enclosures	Applies
26.8	26.8	Thermal endurance to heat	Applies
26.9	26.9	Thermal endurance to cold	Applies
26.10	26.10	Resistance to light	Excluded
26.11	26.11	Resistance to chemical agents for Group I electrical equipment	Applies
26.12	26.12	Earth continuity	Excluded
26.13	26.13	Surface resistance of parts of enclosures of non-metallic materials	Applies
26.14	NR	Charging tests	Applies
26.15	26.14	Measurement of capacitance	Applies
NR	26.15	Verification of ratings of ventilating fans	Excluded
NR	26.16	Alternative qualification of elastomeric sealing O-rings	Applies
27	27	Routine tests	Applies
28	28	Manufacturer's responsibility	Applies
29	29	Marking	Modified
30	30	Instructions	Applies

Applies – This requirement of IEC 60079-0 is applied without change.

Excluded – This requirement of IEC 60079-0 does not apply.

Modified – This requirement of IEC 60079-0 is modified as detailed in this standard.

NR – No requirements.

^a The clause number in this table is shown for information only. The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of the sixth edition of IEC 60079-0:2011. The clause numbers for the previous edition are shown for information only. This is to enable the General requirements of the fifth edition of IEC 60079-0:2007 to be used where necessary with this part of IEC 60079. Where there were no requirements (indicated by NR) or there is a conflict between requirements, the later edition requirements take precedence.