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They are used in commercial and industrial applications where the ground lead and connection needs to be isolated from the conduit (electrical wiring is run in conduit [or BX cable] and the conduit functions as ground). Therefore IG outlets have no useful purpose in a residential setting and are not worth the expense.


Upgrading your outlets is a worthwhile endeavor, but all you need for that is commercial spec-grade devices. They’re as robust as IG outlets and a lot cheaper.


Regards,

Wayne A. Pflughaupt
 

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I just bought a bunch from HD for a commercial job: Leviton 20-amp spec-grade units, for just over $4 each. By the way, 15-amp and 20-amp receptacles are identical inside; the only difference is the T-slot. You only need one if your gear has a 20-amp plug. Code permits 15-amp receptacles on 20-amp circuits (as long as it's not a single receptacle, like an A/C socket); even one duplex is okay.
 
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