Page 325 - Offshore Electrical Engineering Manual
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312 CHAPTER 4 Hazardous Area Installation
FIGURE 5.4.2, cont’d
‘SIMPLE’ APPARATUS AND COMPONENTS
Simple electrical apparatus and components (e.g., thermocouples, photocells, junc-
tion boxes, switches, plugs and sockets, resistors, LEDs) may be used in intrinsically
safe systems without certification provided that they do not generate more than
1.2 V, 0.1 A, and 25 mW in the intrinsically safe system in the normal or fault
conditions of the system.
The ‘Simple’ apparatus should conform to all relevant requirements of the BS
EN 60079-11. Simple apparatus intended for use in Zone 0 requires specific protec-
tive measures. For such apparatus, EN 60079-26 and EN 1127-1 apply in addition to
EN 60079-0 and 60079-11. Special requirements, e.g., for electrostatic charging of
