Sizing of Supply Side bonding jumper

[mshields]

Just reviewing 2011 code changes, specifically 250.102(C) which has to do with the sizing of the Supply side bonding jumper. Here's my question. If your comming off, say a 45kVA delta wye transformer, the ground conductor to your 208V panel is now referred to as a "supply side bonding jumper" correct. And the size of that conductor is to be based on 250.66.

Was this cable size, prior to this change, based on Table 250-122.

 

[Smart $]

Just reviewing 2011 code changes, specifically 250.102(C) which has to do with the sizing of the Supply side bonding jumper. Here's my question. If your comming off, say a 45kVA delta wye transformer, the ground conductor to your 208V panel is now referred to as a "supply side bonding jumper" correct. And the size of that conductor is to be based on 250.66.

Was this cable size, prior to this change, based on Table 250-122.

No. The name was changed (to protect the innocent )) but otherwise remains the same.

 

[Little Bill]

Just reviewing 2011 code changes, specifically 250.102(C) which has to do with the sizing of the Supply side bonding jumper. Here's my question. If your comming off, say a 45kVA delta wye transformer, the ground conductor to your 208V panel is now referred to as a "supply side bonding jumper" correct. And the size of that conductor is to be based on 250.66.

Was this cable size, prior to this change, based on Table 250-122.

I think Mike Holt has a video about this on here and on YouTube.

 

[mshields]

Is it a supply side bonding jumper regardless of where you bond?

Is it a supply side bonding jumper regardless of where you bond?

While bonding usually occurs at the transformer for a Separately Derived Systems, you can can bond at the secondary panel. Does this impact the role of this conductor and therefore what you call it and therefore how you size it?

 

[cripple]

Sizing of Supply Side bonding jumper

2008 250.30(A)(2) equipment bonding jumper was changed in the 2011 was changed to supply side bonding jumper, but sizing requirement remained the same.

 

[Smart $]

While bonding usually occurs at the transformer for a Separately Derived Systems, you can can bond at the secondary panel. Does this impact the role of this conductor and therefore what you call it and therefore how you size it?

Under 2008 and earlier, it was somewhat confusing as to what to call and size this grounding conductor. Under 2011 it is called the SSBJ regardless of where the GES or its GEC's are connected.