Sorry to keep bugging you guys but I have another one for you. Tomorrow I have a job at a house that is going from a gas package system to a split electric heat pump. The panelboard does not have additional space (slam full 20/40 homeline) to add the 2 240v circuits for the e-heat and the booster heat. Currently there is a 40 amp circuit that feeds the package system and we need (according to the nameplate data) an outdoor 40 amp and indoor 30 and 60 amp circuits.
My foreman's plan thus far:
Use the spaces for the existing circuit, add a 100 amp breaker to a sub panel. Feed with #4. Install 60, 40 and 30 amp breakers to sub panel.
Only 2 of the 3 circuits will be in use at one time.
-If the heat pump fails, the e heat takes over, using the 60 and 30
-In normal AC mode, the 40 is in use and the 30 should only have a few amps on it for the blower
All 3 circuits will be in the same 1-1/4" conduit. #8 for both 30 and 40 and #6 for the 60. Run is ~10 feet. Is this ok?
-I would prefer to upsize each circuit one size and use either 1-1/2" or 2" conduit.
-Again, not all 3 circuits will ever be used at the same time.
-There really is not a way to use multiple raceways. (Stucco house)
Again, sorry to keep bugging you guys. Im not all that code savvy but having that many circuits in one conduit just seems like a lot.