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vinod tomar
Active Contributor

Join Date: Jun 2010
Posts: 15

Neutral Earthing for Multiple Transformers

06/13/2010 12:11 AM

Can multiple transformers used with parallel UPS system have common neutral earthing?
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Anonymous Poster
#1

Re: Neutral Earthing for Multiple Transformers

06/13/2010 5:01 PM

Yes, I think that the best way for paralleling UPSs insulation transformer including the by-pass transformer is to use a neutral bar where you connect all the neutrals.

Cilmo.
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vinod tomar
Active Contributor

Join Date: Jun 2010
Posts: 15
#3
In reply to #1

Re: Neutral Earthing for Multiple Transformers

06/14/2010 12:02 AM

i worried about the neutral currents between the ups and the bypass supply. Also can these neutral currents for a close circulating path between the UPS's.
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baxterm
Power-User

Join Date: Oct 2008
Location: Thousand Islands, Ontario, Canada
Posts: 187
Good Answers: 9
#2

Re: Neutral Earthing for Multiple Transformers

06/13/2010 11:00 PM

Jeesh,, I should hope so!
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#4

Re: Neutral Earthing for Multiple Transformers

06/14/2010 10:18 AM

Each UPS with an Isolation Transformer is a Separately Derived Source and as per NEC (National Electric Code), each sepaartely derived source must be earthed separetly only.
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