Since the neutral and ground are isolated in a sub panel, is wiring a 240 volt heater from a sub panel different from wiring it to the main panel?
Electrical – Is wiring a 240 volt heater from a sub panel different from wiring it to the main panel
electricalheatersubpanelwiring
Related Solutions
I assume you are in the USA. The heater is probably a pure 240V load with no need for the neutral (white) wire. you should simply cap the white wire with a wire nut and tuck it back into the electrical box.
According to Table 250.122 of the National Electrical Code, a 10 AWG copper conductor is fine as an equipment grounding conductor for circuits with up to 60 ampere protection.
National Electrical Code 2014
Chapter 2 Wiring and Protection
Article 250 Grounding and Bonding
250.122 Size of Equipment Grounding Conductors.
(A) General. Copper, aluminum, or copper-clad aluminum equipment grounding conductors of the wire type shall not be smaller than shown in Table 250.122, but in no case shall they be required to be larger than the circuit conductors supplying the equipment. Where a cable tray, a raceway, or a cable armor or sheath is used as the equipment grounding conductor, as provided in 250.118 and 250.134(A), it shall comply with 250.4(A)(5) or (B)(4). Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable, provided the combined circular mil area complies with Table 250.122.
Related Topic
- Wiring – installing sub panel in garage off of house main
- Electrical – Wiring 100-amp sub-panel for 1hp pool pump and heater
- Wiring – main breaker panel to sub panel
- Electrical – Adding sub panel, odd main panel configuration
- Electrical – Sub-panel wiring, grounding, disconnect
- Wiring from basement main panel to garage
- Electrical – How should a sub panel be grounded if next to the main breaker
Best Answer
No, as long as you land the ground wire on the ground bus of course -- but that's a caveat when wiring anything to a subpanel. (I'd run it using /3 NM so that there's a neutral run to the heater in case it's needed for outlets on a baseboard setup or something like that...and in that case, you also have to remember to land the neutral wire on the neutral bus, but again, that's just like any other circuit.)
The hots hook up just like any other 220V circuit.