Hi All,
Roger, you're right!!! The best VD computaton is only an approximation. POCO, conductor age, connections, circuit breaker age, etc. are all non-calculated contributors that cause computation vs actual VD variations.
iwire, A simple case is when you run conductors over a roof or attic where the ambient temperature can reach high levels. Unless the conductors are sized with regards to VD, this will cause a large VD that will start the insulation degradation process that will lead to a fire.
Tripp, I forgot about your VD, sorry.
I can see that the runs are 45' for aluminum and 87' for copper. Please post the conductor size, ambient temperature, and the raceway type and I'll knock it up right now.
