oversized neutral for ATS switch
- Thread starter anbm
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ron
Senior Member
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- New York, 40.7514,-73.9925
It depends on why you oversized the neutral conductor. Was it for voltage drop or harmonics or ....
the size of the lug (s) ?
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
The ATS neutral needs to be specified to (at least) the same current overrating that you've used to calculate your wire oversize. I dont know if you can order a mechanical ATS that way, but certainly you can order Cyberex four pole static switches with 200% neutral switching capability. If you cant get a overrated neutral ATS then you should upsize the ATS to match the neutral ($$$ - ouch!)
This annoyance is one of the reasons why my standard advice for ATSes is to use solid neutral with three pole switching wherever possible; only switch neutrals if you absolutely have to. An ATS dropping a phase is an annoyance, but dropping a neutral is very expensive...
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