Why EGC Separate?

[petersonra]

I'm inclined to agree with the guy who thinks the green cable is some kind of communication gable. I am not sure but it looks to me like there's some kind of a flexible conduit coming out of the other side of these things That's probably power.

 

[infinity]

That is not an EGG, its a green data cable, device net, ethernet or similar. Those are valve actuators like Rorork, or Limitorque, maybe for a rising stem type valve, with a lead screw. Since there are so many valves, they are networked using the green cable. Discrete wiring to each valve would be a lot of wires!
What type facility is this? My guess is a treatment plant.

I agree, that's why I said the EGC is in the cord. That green thing to my eye is not a bonding jumper or serving some other grounding purpose.

 

[ptonsparky]

I've never quite understood the need for term "equipment bonding jumper". Why can't it just be an EGC?

Because it's being used to bond?

 

[petersonra]

Because it's being used to bond?

What does it bond to

 

[yesterlectric]

That doesn't look like a copper wire to me either. But bonding jumpers are allowed in some limited circumstances outside of short raceways, as was described here. I think the reason is that some would prefer they be easily inspected. But that's normally with things like LFMC. In the photo, it looks like there is nonmetallic cable supplying the equipment. In that case, I'm not sure it would be allowed anyway.

 

[ptonsparky]

What does it bond to

Any other part that needs bonded.

 

[mbrooke]

Any other part that needs bonded.

Would an EGC in the black cable not be enough?

 

[ptonsparky]

Would an EGC in the black cable not be enough?

For you and me, Yes. Maybe not for whoever wrote the specs. IDK what we are looking at, why so much flexibility is required, why green multi conductor cable or why they choose green.

 

[mbrooke]

For you and me, Yes. Maybe not for whoever wrote the specs. IDK what we are looking at, why so much flexibility is required, green multi conductor cable or why they choose green.

Curiosity has be captivated on what they spcs writers were thinking.

 

[fishin' electrician]

I certainly haven't seen it all, but I would expect external bonding jumpers to be connected, well, externally.

 

[mbrooke]

I certainly haven't seen it all, but I would expect external bonding jumpers to be connected, well, externally.

Perhaps, but in my mind reactance gets a bit higher. Though in theory this can be taken into account.

 

[hillbilly1]

I think one of the reasons behind having an external egc, is on motors, the connection boxes are small, so one less wire makes for easier connections. Especially on big wire. Normally the external egc terminates on an external lug on the fittings.

 

[kwired]

I have done wiring in bulk fuel stations a few times. The tank/piping install crews usually run bare copper between items and around any insulating or removeable joints in piping, for static equalization purposes I would assume. None of it was ever brought directly to any electrical equipment enclosures. Pump motors is about only thing I had that is involved from the electrical system and the EGC is usually only 12 or 10 AWG vs their bonding jumpers of at least 6 or 4 AWG.