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#48629 02/16/05 02:47 PM
Joined: Mar 2003
Posts: 849
We're looking at removing some older(30 yrs plus) lead jacketed 5 kv cable(size 750). Can anyone tell me where I can get amperage on this cable??? I figure we only need 5 sets of 3-500s to replace it (2000 amp) in conduit in open air copper shielded. They had 5 sets of 750.Thanks in Advance.

Joined: Feb 2002
Posts: 182
Bob Offline
Is this paper insulated lead covered 3 conductor cable in a duct bank? Why change. If you don't break the lead cover, it will last 300 years.
In a duct bank, 1 cable per duct
100% LF amps = 505
75% LF amps = 550
50% LF amps = 581.
If you have more that one cable in the ducts bank the rating drops. You probably need to contact a MFG to get the rating.

[This message has been edited by Bob (edited 02-16-2005).]

Joined: Mar 2003
Posts: 849

As far as I see by the code theres no derateing for 3 conductors in a conduit in a duct bank in open air, in the ground in a duct bank yes. As far as lead covered conductors, theres 3 one conductor cables in each pipe times five. They tested them and feel they should be replaced. Thanks fer input.

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