[Basttrax]

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...

 

[Tsmil]

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.

 

[guest]

Thanks for posting on ElectricianTalk.com. However, working with electricity and electrical systems can be unsafe if not done by a professional licensed electrician. The moderators of this site would like to advise you to contact a professional electrician in your area.

If you are permitted by law in your area to do your own electrical work, please sign up at our sister site, www.DIYChatroom.com where many of our professionals are also members and are looking forward to assist you with your needs.

Please take a moment to post your question at www.DIYChatroom.com If you're not already a member of DIYChatroom.com you can sign up for a free account by going to http://www.DIYChatroom.com/register.php/

We apologize for any inconvenience that this may have caused. This thread has been closed.