SSBJ

[Alwayslearningelec]

If I'm running 2 hots, 1 SSBJ, 1N and 1G from secondary side of xfrmr to a 2P disconnect switch where would the SSBJ land in the disconnect switch?

 

[infinity]

Connected directly to the switch enclosure via lug or an EGC bus if there is one.

 

[electrofelon]

If I'm running 2 hots, 1 SSBJ, 1N and 1G from secondary side of xfrmr to a 2P disconnect switch where would the SSBJ land in the disconnect switch?

Connected directly to the switch enclosure via lug or an EGC bus if there is one.

Wouldn't the "G" mentioned BE the SSBJ?

 

[infinity]

Wouldn't the "G" mentioned BE the SSBJ?

Yes. I missed that "G" part.

 

[Alwayslearningelec]

Thanks. On a side note

1. If you have a 3P fused disconnect switch can you only use 2 poles?
2. If you have a 3 phase xfrmr and only need 2 phase conductors on the secondary side( running to disconnect in item #1). Can you do that?

 

[augie47]

Yes.
Yes

 

[Alwayslearningelec]

Yes.
Yes

Thank you.

 

[wwhitney]

If I'm running 2 hots, 1 SSBJ, 1N and 1G from secondary side of xfrmr to a 2P disconnect switch

They you would have one wire more than you need. Just confirming that you got the upshot of post #3.

Cheers, Wayne

 

[Alwayslearningelec]

They you would have one wire more than you need. Just confirming that you got the upshot of post #3.

Cheers, Wayne

I wasn't aware the ground could be the SSBJ. Thank you.

 

[wwhitney]

I wasn't aware the ground could be the SSBJ. Thank you.

Basically the EGC and the SSBJ perform the same function. So they are just different names for the same thing depending on whether it is upstream or downstream from the first OCPD on the supply system. Because the EGC sizing rules are based on the size of the upstream OCPD, and so they can't apply upstream of the first OCPD.

Cheers, Wayne

 

[infinity]

I wasn't aware the ground could be the SSBJ. Thank you.

Another reason for the distinction between the two is that the SSBJ is usually larger than the EGC on the load side of the disconnect.