Mike Dolt Enterprises
Mike Dolt Enterprises
User: dhalleron, Location: Louisville, KY
Asked on: Thursday, June 2, 2011 at 10:25 pm EDT
Answered on: Tuesday, May 14, 2024 at 6:09 am EDT
Question: I screwed up on an upgrade from 100 amp to 200 amp resi service quotation. I figured going straight up 10' from the meter like the existing and then the meter locator guy told me he needed the point of attachment to be almost 25' farther away. I should have noticed the window on the second floor addition that the old service drop passed in front of, but oh well.Anyway, I have some 3/0 wire that will be so close to making the long neutral. I have a 49' piece.I really don't know how much wire to figure for 90 degree bends and LB's when calculating the wire. Normally I don't care much, but I have a certain amount of wire and want to know if it will reach.Still don't know how to add a picture. Here's a link with conduit measurements. Will a 49' neutral make this run from the service drop to the main breaker in the basement?https://picasaweb.google.com/lh/photo/-Z_DJyWSho-TkRBLknpwvEWUoLppfOJ37wRHoj2LlqI?feat=directlinkThanks for any input!
Conduit Run Measurements
Conduit from service drop to second floor LB: 15' Conduit from LB to basement LB: 20' Conduit from basement LB to main breaker: 14'
Wire Length Calculations
Service drop to second floor LB: 15' + 2' (for 90° bend) + 2' (for LB) = 19' Second floor LB to basement LB: 20' + 2' (for 90° bend) + 2' (for LB) = 24' Basement LB to main breaker: 14' + 2' (for 90° bend) = 16'
Total Wire Length Required
19' + 24' + 16' =
59'Conclusion
Based on these calculations, a 49' piece of 3/0 wire will
not be long enough for the neutral run from the service drop to the main breaker. You will need to procure an additional piece of wire to complete the installation. Flag for review