This is an electrical question pertaining to derating more than three conductors in a single run of conduit.
I am feeding a 54 amp, 220 amp tankless hot water heater, and a 5000 watt, 220v A/C with electric heat from the main panel through 1 1/4" conduit.
tankless water heater through 1 1/4" conduit. Amd I plan to run 15 feet of #10 wire to the A/C through the same size conduit, and place the A/C on a 30 amp breaker.
There will be four current carry conductors in this conduit. I don't have a copy of National Electrical Code handy. The answer to this question can be found in the National Electrical next to ampacity capacity of wire size or conduit fill.
Can anyone help me calculate the derating of these conductors?
You can just email me the formula from the national electrical code.