AnsweredAssumed Answered

NFPA 780 Number of down conductors required

Question asked by otorres on Jun 18, 2018
Latest reply on Jun 18, 2018 by chriscarlson

I have some questions about the number of down conductors required on a flat/gently sloping roof and a wall;

For a wall, say a mechanical yard wall that is 440' feet long and 1' wide, from one end to another that do not meet, how many down conductors are required? I say it is 6 since one is required at each end and 4 so that spacing does not exceed an average of 100'. Or is the correct answer 5?

Does a flat roof with a perimeter of 220 require 2 or 3 down conductors?