» Get Your Copy: Home Electrical Wiring Guide
» Do You Need Electrical Help? Ask a Question
Wiring a 220 Volt Furnace
By Dave Rongey
Summary: Electrical Wiring Question:
220v electric furnace hook up. for a furnace. I have installed a 220v electric furnace but have not finished the wire hook up and need some help.
How to Wire a 220Volt Electric Furnace
Electrical Question from Ray
Wiring Project: A 220v electric furnace hook up.
Additional Info: I have installed a 220v electric furnace but have not finished the wire hook up.
The wiring diagram shows L1 and L2 for the hot sides (red and black) and the ground is separate. There is not a place to hook up the neutral (white) wire.
Some info I have found shows that a furnace can be run with only two hot lines and a ground line. I have already wired my whole house, garage, hot tub, and shop and all is up to the electrical code. I don't want to make a boo boo now. Any info to would be helpful.
I understand your question, a lot of people get confused with 220 Volt circuits and just what to do with the extra white wire. I remember long ago asking my Dad about this as well.
220Volt or 240Volt Circuit
The bottom line is this, if the nameplate calls for a 220 or 240 volt circuit then with few exceptions is there ever a need for a neutral wire. One exception would be hot tubs where there is a GFCI breaker installed which has a separate neutral.
If there is no termination for a neutral and the instructions do not call for a 3-wire circuit with a ground then a neutral is not needed. But with equipment such as air conditioners, and in this case a 220 volt electric furnace, a neutral is not needed, only the ground wire.
What to Do with a Spare Wire
So just cap the neutral off because its a spare wire, (better to have too many than not enough!). In the future I'm sure we will start to see a required neutral which has already begun with electric ranges and clothes dryers.
L1 and L2 Wiring
As you mentioned, the L1 and L2 are the 2 hot lines coming in and it does not matter which one goes where.
Make sure your ground wire is attached to the provided ground lug or terminal, and back at the panel bond the ground as well. It sounds like you have been busy wiring your home, good for you!
Did you include interlinked smoke detectors and GFI's in the appropriate locations? I'll bet you did if it is all up to code.
Let me know if this helps.
The Safest Way to Test Electrical Devices and Identify Electric Wires!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
|Electrical Wiring Questions and Answers|