maybe somepointers

[surf more]

i am lost-just can not put it togeter-----a 24 inch ventilated cable tray contains 4 500kcmil thw single conductor cables.how many extra 250 kcmil thw single conductor cables can be installed.


answer=49

table5 chap9



i can not figure how to come up with this answer----insight??????????

 

[westernexplorer]

Read Article 392 of The National Electrical Code. This article will guide you in the installation and sizing of Cable Tray and conductor fill for Cable Tray.

 

[Twoskinsoneman]

Were you able to get it?

392.10(A)(2)

 

[Smart $]

Were you able to get it?

392.10(A)(2)

That's the right code reference but it won't give the right answer... or should I say it will give the right answer, but it won't match the answer provided for the question.

Backing up a little, this is a bad question to put on any test without providing more info. First, the NEC does not give dimensions/areas of tray cable. Couple that with every manufacturers size/area will likely differ some. Heck, just with Okonite alone, they make four differnet types of single conductor tray cable (SCTC), and each is different in size/area.

Say just for instance the SCTC is RHW-2 and use Chapter 9, Table 5 figures, the correct answer will be 34

(26.00 in? – (4 ? 1.0082 in?)) ? 0.6291 in? = 34.9​

PS: I just noticed the OP says the conductors are thw. Anyone ever seen thw tray cable?