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CABLE STACKING

CABLE STACKING

CABLE STACKING

(OP)
Hello,

I read a recent post that included a problem with excessive heating do to the way the cables were stacked.  I can not find it, but there seemed to ba some knowledgable people in this area....

I am going to be feeding 3 MV toshiba JK power cells with 2 runs of 3/0 per phase (400amps each - 1000V system). Only two will run at the full 400A's the third will run at about 1/4 of that.

Are there any issues if I run the cables in the following fashion?

A A A A A A
B B B B B B
C C C C C C

The cables would be evenly spaced using a product called koz blocks (http://www.jms-supply.com/koz.html)

Any help appreciated.

Regards,
TULUM

RE: CABLE STACKING

(OP)
Forgot to mention...

I am only going about 15 feet from the secondary of a transformer to the cells......

RE: CABLE STACKING

Hi tulum;
How about


  A1  B1  C2  A2  B3  C3
  B1  C1  A2  B2  C3  A3
  C1  A1  B2  C2  A3  B3

Do I remember that your in Canada? Check the Canadian Electrical Code. There are some suggestions in the notes to the rules (Appendix B).
respectfully.

RE: CABLE STACKING

You say two #3/0 per phase, but your diagram seems to indicate six per phase. Two #3/0 should be adequate for 400 amps, if spaced. Take a look at the code requirements for cable tray installations.

The proposed arrangement will result in unbalanced impedances, which will result in a slight voltage unbalance (probably not noticable for 15ft). Waross's idea may help with that.

It sounds like you are building cablebus.
http://www.cablebus.com/

RE: CABLE STACKING

(OP)
Thanks folks,

Waross,

Thanks for the reference...I will check the code.  We could try the configuration you referenced...

Alehman,

Sorry... There are 3 feeder circuits each at 400A... i.e. (2) 1c per phase per feeder...

The electricians have come up with a couple other ways to run the cable.... I will keep you posted...

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