This query has been lying here festering for a couple of days. Seems like no one really wants to get out in the lead (and become a target).
Here goes. If you are applying 520.6, and are otherwise in compliance with that article, no derating of the conductors is required.
The last sentence waives the 30 conductor limitation of 366.6 & 376.22 Both of these require derating when exceeding 30 current carrying conductors. Since the rule is waived, derating is not required.
Do I need to put on my asbestos coveralls?
[This message has been edited by Tom (edited 04-15-2002).]