We are supplying (120v) 2000VA of parking lot lights 130' away. The foreman ordered #10 pulled. The boss questioned the #10 and recomended adjusting ungrounded conductor to #8 for voltage drop (the foreman agreed). There is sufficient ampacity in the 10's, so does the #10 neutral also need to be replaced with #8, or just the hot since we don't care about voltage drop going to ground?
Voltage drop doesn't care if it is coming or going, they add. You should make the neutral the same size as the ungrounded conductor. It might be argued that in a multiwire the neutral would not need to be any bigger than the 240.4(D) requirement since if the load was balanced it would not carry any current at all. If this is just a single circuit it carries the same as the ungrounded wire.
#61939 - 02/06/0603:55 PMRe: Voltage Drop on Neutral
Walrus, lightning protection and/or a HV event is the only reason for the rod.
Specialty, Welcome to the forum.
Now, the individual pole grounding will not protect the pole, light, or people from a fault, and infact without a EGC it can add to the dangers in the way of dangerous voltage gradients around the rod in a fault condition.
You MUST install an EGC for people safety. This is non negotiable.