Calc Question

[Alwayslearningelec]

How do you handle derating for conduit/wire ran in PVC coated RGS on roof? It's a lot of footage on the roof but probably only 50% of toral run.

 

[augie47]

What type conductor insulation (XHHW is 'different') ? and how high is the conduit above the roof ?

 

[infinity]

What code cycle?

 

[Alwayslearningelec]

What code cycle?

What we nyc is on. 2010?

 

[Alwayslearningelec]

What type conductor insulation (XHHW is 'different') ? and how high is the conduit above the roof ?

Have to check on conductor insulation...they are on racks so there is a row about 1' the another about 2' then another about 3'

 

[infinity]

The 2008 NEC requires derating according to T310.15(B)(2)(C).

 

[Alwayslearningelec]

Below is example of run. 2500 is trip amps.

 

[infinity]

Below is example of run. 2500 is trip amps

You would need to apply the derating based on the temperature adder in the table.

 

[Alwayslearningelec]

Sorry, many(12) sets obviously.