intrinsically safe circuit

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Rai136926 said:
once the intrinsically safe circuit passes through the first seal off can it be installed per chapter 3 wiring methods?
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You are not limited to just Chapter 3 wiring methods. You can use any wiring method that would otherwise be appropriate for a non-hazardous classified area.
 
In addition to Smart$'s comment, see Section 504.10(C). It's not common, but a manufacture may add a restriction or two.
 
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