Single-pole 220V Switching - Electrical - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical


Thread Tools Display Modes
Old 12-30-2008, 05:42 PM   #1
Join Date: Dec 2008
Posts: 1
Rewards Points: 10

Single-pole 220V Switching

I bought a themostat for a new 220V baseboard heater. The thermostat is from Honeywell as is the heater, and noted "110V or 220V." I am curious how it breaks only one hot leg, and not both. (thus, single-pole)
Doesn't this leave one hot, unswitched wire at the appliance? Why wouldn't the heater work with the one hot, unswitched leg?


BergquistC is offline   Reply With Quote
Old 12-30-2008, 05:46 PM   #2
Licensed Pro
Join Date: Mar 2007
Location: SC
Posts: 1,571
Rewards Points: 1,000

It does leave an unswitched hot, but it interrupts the other hot leg so the 240V circuit is not complete.


"Life is hard. Life is harder when you're stupid." John Wayne
HouseHelper is offline   Reply With Quote
Old 12-31-2008, 12:50 PM   #3
Join Date: Jun 2007
Posts: 3,793
Rewards Points: 246

And yes, you can get shocked if you open the heater connection box without turning off the breaker. One leg will always be hot at the heater.

A 240 volt appliance needs both wires to complete the circuit. The thermostat only opens one wire. It is due to the manufacturer that made the T-Stat. It's much cheaper to build with one contact than with two.
J. V. is online now   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Single Pole vs. Double Pole Thermostat dforeid Electrical 14 08-26-2012 08:12 AM
Separate Single Pole Switches for Ceiling Fan Light and Fan Only estatehomes Electrical 19 01-13-2012 06:13 PM
Converting a single pole switch to a 3 way Rze Electrical 9 05-02-2011 10:10 AM
Wiring a single pole switch into a 220v circuit rlmorgan Electrical 38 10-15-2008 07:59 PM
single pole vs. double pole circuits DannoW Electrical 7 07-21-2008 09:20 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1