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Unelec ACB details

Manish Makwana
Hello,


I'm designing for an upgrade of some very old electrical distribution boxes. These are fed by 1000A Unelec ACBs. I'd like to find out if these have been set to a different trip current, as they are connected to PILC cables of perhaps 185-240mm2. It looks as if these cables can't handle anywhere near 1000A.


From the engraved plate on the side of the breaker, the two types of breakers in use are:

- DVAS UR 7 IN

- PVRT UR 7 IN.


Nothing appears on google for these. Much of the field equipment dates back to the 1960s and 70s, so I'm assuming the breakers are from that era too.


Does anyone know anything about these kinds of breakers, or would know who to talk to? I have emailed Unelec as well, but given their website has not been updated since 2007 I'm not sure what to expect.


Thanks
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  • 0
    The idea with using a PQM is to identify the size of the downstream loads. Many are protected by fuses, and while I can see the maximum size of fuse that can go in the fuse holder, I don't know the size of the installed fuse. Also, the paper insulated lead covered cables that supply the field distribution boxes seem to be oversized for the downstream loads. Yet the 1000A breakers at the switchboard appear to be massively oversized for the cables. So basically there is a mess of outdated and mismatched equipment with no site records!


    I'm not interested in harmonics as there aren't any VSD loads, I just want the average and peak size of the loads.
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  • 0
    The idea with using a PQM is to identify the size of the downstream loads. Many are protected by fuses, and while I can see the maximum size of fuse that can go in the fuse holder, I don't know the size of the installed fuse. Also, the paper insulated lead covered cables that supply the field distribution boxes seem to be oversized for the downstream loads. Yet the 1000A breakers at the switchboard appear to be massively oversized for the cables. So basically there is a mess of outdated and mismatched equipment with no site records!


    I'm not interested in harmonics as there aren't any VSD loads, I just want the average and peak size of the loads.
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