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auto xfmers questions #101274
03/02/07 11:00 AM
03/02/07 11:00 AM
R
Reel-Break  Offline OP
Member
Joined: Apr 2002
Posts: 178
nc
Hey we have a dicussion here in the shop. I`m wiring a machine 380 volts 3phase. Well The rated kw reads as follows 380@70kw max.
I get 2 25kva xfmers and wire per 575/380 output my total figured kva is 103. Ok that`s my total avalible if needed.Co-workers maintain I should figure wire size and ocp according to 103 but I`m only using 70 of the 103 and plan on sizing accordingly.Also now here`s one thing we`re all unclear about in the auto configuration would we say 70kw/380x1.732=106amps
or use 70kw/575x1.732=70amps? Thanks in advance.

2017 / 2014 NEC & Related Books and Study Guides
Re: auto xfmers questions #101275
03/02/07 02:14 PM
03/02/07 02:14 PM
R
Reel-Break  Offline OP
Member
Joined: Apr 2002
Posts: 178
nc
I`m thinking that the voltage is 380 to the machine so I`m planning on going with 106amps calc. 125 ocp 1/0 wire thhn.

Re: auto xfmers questions #101276
03/03/07 03:43 PM
03/03/07 03:43 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA


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