Posted by John T on December 13, 2021 at 13:44:06 from (174.212.42.7):
In Reply to: OT...wiring question posted by Dave H (MI) on December 13, 2021 at 12:21:30:
Dave, what you describe can be found in many older homes and older appliances, here's the deal
SHORT ANSWER rewire the home and install proper Three Pole 4 Wire Grounding (4 pin) Receptacles for appliances that use 120 as well as 240 like dryers or stoves etc etc that have Three Pole 4 Wire (4 pin) Plugs......
NOOOOOOOOOOOOOOO the Neutral (A GrounDED Conductor) jumped to the Ground (A GroundING Conductor) in a receptacle is NOTTTTTTTTTTTTTTTTTTTTTTTTTTTTT correct !!!!!!!!!!!!!!
The Safety Equipment GroundING Conductor is ONLY for fault current, NOT normal Neutral return current
The Hot Live normal return current carrying insulated NEUTRAL is NOTTTTTTT intended to carry fault current.
Some OLDER appliances that were straight 240 used Plugs (and matching receptacles) with Three Pins, Two Hots L1 & L2 (240 L1 to L2) plus a Safety Equipment (often Bare/Green) GroundING Conductor.
Iffffffff a stove or dryer had (in addition to 240) say a 120 VAC timer or outlet etc., they sometimes used the GroundING Conductor as a substitute Neutral since it was in fact 120 VAC L1 or L2 to Ground so the 120 device worked BUT THEY WERE USING THE GROUND AS A RETURN CURRENT CARRIER NEUTRAL grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr but it's ONLY for fault current NEVER normal return current !!!!!
NOTE the reason this works is because in the Main Panel there's a Neutral to Ground BOND............The two Buss, Neutral and Ground are BONDED together.........OR SOMETIMES ONE SINGLE COMMON BUSS IS USED
NEWER appliances that had BOTH 120 as well as 240 internals used Plugs (and matching outlets) that had 4 pins, Two Hots, One True Insulated GrounDED Conductor Neutral, One Safety Equipment GroundiNG Conductor (Bare/Green).
Some older home wiring systems and appliances uses what's called a BOOTLEG GROUND where they jumped the Neutral to the Bare/Green. Thats how a modern appliance with 4 wires may be cheated to work on an older 3 wire system IE they tie/jump the Neutral and Ground NO NO NO
ITS MY ADVICE DO NOTTTTTTTTTTTTTTTTT DO THAT but instead if the appliance has a 4 pin Plug and uses 120 and 240 USE A 3 POLE 4 WIRE GROUNDING PLUG AND RECEPTACLE and run FOUR wires back to the panel, Two Hots, One Neutral, One Safety Equipment GroundiNG Conductor of rated ampacity to a proper rated circuit breaker in the panel
DISCLAIMER Im longggggggggggg retired from Power Distribution Design Engineering so NO warranty but believe this remains true
Hope this helps post any questions. Typically any Electrical or Legal questions draw out the most responses, if any doubt where fire or life safety are concerned don't take just any opinions, but consider consulting trained professional electricians or engineers and the NEC DO NOT take my word for it, I'm too long retired n rusty GRRRRRRRRRRRR lol
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