Allowable voltage drop on a circuit
Question for the gurus of the National Electrical Code
We have a new home being built. As engineers (oh, no collective groans, please :-) ) we are trying to ensure the home is built well and safe.
We have a couple of circuits which are showing excessive voltage drop under 15 Amp load (we have a tester). These circuits are showing greater than 10% voltage drop, RMS, under the 15 Amp load.
One of these circuits also has 5 duplex outlets, a switched duplex outlet, 2 multi-bulb switched light fixtures, and a switched bathroom fan all on the same 15 amp circuit.
The builder says his electrician insists the wiring was done to code. Yes, the actual wiring was assuredly the correct gauge, etc., but what about performance to code?
This is not an inexpensive home and we don't understand the pushback. We are concerned about fire safety and equipment warranty.