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Discussion Starter · #1 ·
Hey guys,

I'm doing a private residential job and am having troubles figuring something out.

I'm running a 60 amp subpanel off of the 200 amp panel.
I'm planning on using NMD90 6/3 rated at 90 degrees. (copper)
I'm in Canada.
What is the acceptable voltage drop to a subpanel? 3%? 5%?
By my calculations a 75' run will be slightly under 3%
How long can my run be before I have to jump up to #4?

Thanks!
 

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8-102 Voltage drop (see Appendix D)
(1) Voltage drop in an installation shall
(a) be based upon the calculated demand load of the feeder or branch circuit;
(b) not exceed 5% from the supply side of the consumer’s service (or equivalent) to the point of
utilization; and
(c) not exceed 3% in a feeder or branch circuit.
(2) For the purposes of Subrule (1), the demand load on a branch circuit shall be the connected load, if known;
otherwise it shall be 80% of the rating of the overload or overcurrent devices protecting the branch circuit,
whichever is smaller.
Always took this as 3% to the sub. I'm somewhat new to this though so I could be wrong...
 

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You are only allowed 3%. But be careful because if you take it to the limit to the sub panel, you will not have any room for voltage drop from your sub to point of utilization.
 

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