Over head line
Over head line
(OP)
I have a section of 4160 overhead line that is 336ACSR and then drops down to 2/0 ACSR. According to the code I'm suppose to set my upstream breaker to protect the 2/0 ACSR. However this will cause nuisance trips as the heavier 336 ACSR has heavy loads. I've been told that the other option is to use a recloser at the 2/0, since fuses are not advisable for systems supplying motor loads. However the motor loads are at 600 V after a step down transformer. Is there any way around using the recloser?






RE: Over head line
RE: Over head line
RE: Over head line
If this work is performed by a utility, the compliance with the NEC is optional. Probably the utility standard may provide a guideline in this case.
If this work is in commercial or industrial environment performed by a contractor or consulting firm, it is require to comply with the NEC.
Check if the enclose information could be applicable in your system.
h
RE: Over head line
RE: Over head line
RE: Over head line
h
www.sandc.com/edocs_pdfs/EDOC_001687.pdf
RE: Over head line
Most utilities use fuses on overhead taps without regard to whether or not customers have 3Ø motor load, and depend on the customers having single-phasing protection for their motors. Many utilities would, however, use 3Ø protective devices for circuits that serve mostly industrial loads.
You could also consider sectionalizers on the taps as a less expensive alternative to reclosers.
RE: Over head line
RE: Over head line
Have you considered putting phase loss protection in as part of the motor control? Depending on your circumstances, this may be a lot cheaper.
Regards,
PowerfulStuff
RE: Over head line