Copper Greenfield.

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jgonzalezusnvet

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This is new to me. Can anyone explain?
The copper Greenfield look like feeders coming from below.
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Not knowing what is all going on in that install - I can tell you if you had a single conductor in a ferrous sheathing you would have inductive effects causing you issues you don't want to deal with there, so my guess is you are asking why copper sheathing - induction is why.
 
Copper isn't ferrous...so we won't have that induction issue...but what could this install possibly be? Is it NEC compliant? This is my first time seeing/hearing of copper Greenfield.

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The three going out the top are also in separate raceways, and you can see there is no slot cut in the box.

I agree, there is no way this is NEC compliant.

The metallic conduit and all associated fittings must be listed.

The lock nuts must be aluminum or other non-ferrous metal.

Slots must be cut between knockouts.

And what about conductor fill? Sure looks like more than 53% to me.
 
jgonzalezusnvet said:
Copper isn't ferrous...so we won't have that induction issue...but what could this install possibly be? Is it NEC compliant? This is my first time seeing/hearing of copper Greenfield.

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The induction (eddy currents) are always going to be there. It's just that non-ferrous metal doesn't heat up because of them. So, not just the raceway has to be non-ferrous, also anything that completely encircles the conductors. That means the fittings, lock nuts and the box. The box can be slotted so it no longer completely encircles the conductor.
 
jgonzalezusnvet said:
So if they was slotted between knockouts and all connectors are listed will it still be compliant?

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Nope. 53% fill means you could almost get two conductors in there. This installation looks like 80% fill, to me.

I don't know what size the conductors are, but I would also make sure the box is big enough.

What will happen to the box when the slots are cut? Do I see concentric knock outs? That won't be fun to deal with, and how well are the fittings going to fit after slotting? I would also see if the fittings are listed to be used with knock outs with slots. I wouldn't if I were an NRTL.
 
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