Instr circuits for transformer protective devices

[Isaiah]

Do circuits for transformer instrumentation protective devices such as liquid level, sudden pressure and temperature require an EGC be run with the conductors ?


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[Dale001289]

I don’t think you’d need an EGC. What you described probably falls under 725, Class 2 inherently limited circuit.


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[tom baker]

What voltage and they located in classified area?
For the Class 2 limited energy I ran in normal areas, an EGC was not required by the NEC, but often required by job specs

 

[augie47]

As with most Code, few rules are written in stone, but generally circuits less than 50 volts don't require grounding (see 250.20) but there are exceptions in Art 250 itself an for certain locations.

 

[Isaiah]

What voltage and they located in classified area?
For the Class 2 limited energy I ran in normal areas, an EGC was not required by the NEC, but often required by job specs

Thanks Tom. This is an unclassified area.


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[petersonra]

Thanks Tom. This is an unclassified area.


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I think the "class 2" he was referring to was article 725 class 2 circuits.

 

[petersonra]

As with most Code, few rules are written in stone, but generally circuits less than 50 volts don't require grounding (see 250.20) but there are exceptions in Art 250 itself an for certain locations.

It does not exactly actually say that. In any case, I think the OP is asking about an EGC and not whether a grounded conductor is required.