Metallic Conduit for grounding

[Zyb]

Hi,

can someone explain why I can't use metallic conduit for grounding conductor? Thanks

 

[infinity]

Can you explain what we're looking at? Is that a connection from the steel to a CEE in a footing?

 

[ron]

What kind of grounding conductor is represented? A Grounding Electrode Conductor, a equipment grounding conductor, or some other type?

 

[Zyb]

Can you explain what we're looking at? Is that a connection from the steel to a CEE in a footing?

@infinity @ron

That's a concrete footing with an I-Beam column. the clients want to have the ground wire inside a conduit but it was flag because we use EMT, they say it should not be metallic conduit because it is ground?

 

[infinity]

@infinity @ron

That's a concrete footing with an I-Beam column. the clients want to have the ground wire inside a conduit but it was flag because we use EMT, they say it should not be metallic conduit because it is ground?

So the issue is that a GEC or bonding jumper in a ferrous metal raceway like EMT needs to bonded to the raceway. PVC eliminates the problem.

 

[roger]

250.64(E)

 

[tom baker]

@infinity @ron

That's a concrete footing with an I-Beam column. the clients want to have the ground wire inside a conduit but it was flag because we use EMT, they say it should not be metallic conduit because it is ground?

If you really want to confuse your client point out that EMT, while metallic, is not conduit.
Just use PVC. By the way SCH 80 is allowed for protection from extreme physical damage, same as RMC.
Running GEC in a metal raceway reduces the current from a lightning strike by 97% if it’s not bonded at each end (source IEEE green book).
And in most cases the GEC or bonding jumper does not need protection if inside