CABLE STACKING 1

[tulum]

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

 

[tulum]

Forgot to mention...

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

 

[waross]

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.

 

[alehman]

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/

 

[tulum]

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...