CEI EN 60079-35-1

SAME AS IEC 60079-35-1

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.

¹ IEC 60079-35-2, Caplights for use in mines
susceptible to firedamp – Part 2: Performance and other
safetyrelated matters (to be published).