These maintenance adjustments shall be made in a non- hazardous location.
A CAUTION
If intrinsically safe apparatus and safety barriers require maintenance service and checking, a gas detector shall be used to ensure that there is no explosive gas in the location (maintenance servicing shall be conducted in a non- hazardous location).
(3) Repair
Intrinsically safe apparatus and safety barriers shall be repaired by manufacturers.
(4) Prohibition of modifications and specification changes
Do not attempt to make modifications or change specifications which may affect safety.