When calculating cross-sectional areas of cables, does one need to include the insulation or only the copper conductor? Based on 392.10 footnote b, there is a conversion factor of 507 mm^2 per 1000 kcmil -- this obviously does not take into account any insulation.
***Additional detail if anyone cares to comment:
I have two batteries; each will utilize (3) 777kcmil cables per pole for a total of 12 cables. This is a total XS-area of about 4728 mm^2 (not including insulation).
I would like to place all of these cables in a single cable tray with an inside width of 289 mm. Per table 392.10(A), column (1), I should be allowed a max. fill area of 289/300 x 8400 = 8092 mm^2. Based on calculations ignoring the insulation's contribution to total XS-area, I would expect this to meet the code requirement.
If I repeat the calculations including the insulation (cable outside diameter is 36.86 mm), I get a total cable XS-area of about 12800 mm^2. This way would not meet code.
Thanks for any insight/comments here...
***Additional detail if anyone cares to comment:
I have two batteries; each will utilize (3) 777kcmil cables per pole for a total of 12 cables. This is a total XS-area of about 4728 mm^2 (not including insulation).
I would like to place all of these cables in a single cable tray with an inside width of 289 mm. Per table 392.10(A), column (1), I should be allowed a max. fill area of 289/300 x 8400 = 8092 mm^2. Based on calculations ignoring the insulation's contribution to total XS-area, I would expect this to meet the code requirement.
If I repeat the calculations including the insulation (cable outside diameter is 36.86 mm), I get a total cable XS-area of about 12800 mm^2. This way would not meet code.
Thanks for any insight/comments here...
