Ampere ratings on bus bars?

Discussion about OutBacks "PS" enclosures

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auroraenergy
Forum Member
Posts: 10
Joined: Wed Jul 07, 2004 2:25 pm
Location: Annapolis, MD

Ampere ratings on bus bars?

Post by auroraenergy »

What are the ampere ratings on the TBB and BB bus bars that are used in the PSAC & DC enclosures?
Jason Fisher
Scott Payne

Post by Scott Payne »

Jason,
I know that the TBB is rated to 185 amps. I have to lookup the BB ratings. I'll get back when I have the answer.



Scott Payne
auroraenergy
Forum Member
Posts: 10
Joined: Wed Jul 07, 2004 2:25 pm
Location: Annapolis, MD

BB Ampere rating?

Post by auroraenergy »

Just checking on what the ampere rating is for the BB.

Thanks,
Jason Fisher
Christopher

Re: BB Ampere rating?

Post by Christopher »

auroraenergy wrote: Just checking on what the ampere rating is for the BB.

Thanks,
The BB is designed to handle up to 1000 amps (four 250 amp breakers or four 4/0 AWG cables). This is also the maximum current rating of the PSDC enclosure. The PS2DC enclosure is rated at a maximum of 500 amps and doesn't usually need a BB in it.

The TBB's rating is a little more confusing - the 185 amp rating is actually from one end to the other for carrying current - when you make the AC source connection in the middle it can carry twice that as the current can flow in two directions - so using it with 200 amp circuits is acceptable as long as some thought is used in layout the connections. I argued this with a number of UL inspectors over the years and always got them to approve it. 200 amps is the maximum rating on the PSAC and 100 amps for the PS2AC encloures.

Christopher
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