Posted by John T on October 30, 2019 at 07:21:30 from (45.16.200.171):
In Reply to: Electrical 240 posted by Ed will on October 30, 2019 at 06:06:01:
Ed, here we go, its electrical or legal so look for a ton of opinions. I'm long retired n rusty (NOT current on latest codes or NEC so no warranty) from my days as a power distribution design engineer but FWIW will give you my opinion.
1) You say its "regular 24 volt wiring" wellllllllllll if it was wired according to most codes including NEC or professionally installed, there's a good chance it has Two Hots L1 & L2 (240 VAC) PLUS an Equipment GroundING (Bare/Green) Conductor BUT NO NEUTRAL. If it were jury rigged or installed by a non electrician or Billy Bob or Bubba I have no idea what you have.
2) The codes (if any where applicable or adopted in your jurisdiction) or a professional would NOTTTTTTT wire the Bare/Green Equipment GroundING Conductor for use as a Neutral (typically White) to carry normal return current so NOOOOOOOOOO you cant properly use 120 volts in the event you only have L1 & L2 and an Equipment GroundING Conductor available absent a true Neutral.
3) YES Billy Bob and Bubba or those electrically challenged it would "work" and light a 120 Volt bulb as there's 120 VAC from L1 or L2 to the Bare/Green GroundING Conductor BUT SUCH IS A CODE AND SAFETY VIOLATION use at your own risk
4) One choice is to use a 240 Volt bulb which can be properly powered using the two hots L1 & L2, NO Neutral required.
5) While sure it would work to use two 120 volt bulbs in series that's NOT my preference.
NOTE Neutral is NOTTTTTTTTT the same nor is to be used (or vice versa) as the Bare Green Equipment GroundING Conductor. Neutral carries normal return current its a live and insulated (for good reason) hot current carrying conductor. The Equipment GroundING Conductor is ONLY to carry fault current NEVER normal return current.
Sure you could install a true proper 120/240 volt service by installing FOUR Conductors, L1 L2 Neutral & Equipment GroundING Conductor, but if all you need is a light Id consider a 240 volt bulb.
John T Longggggggg retired n rusty EE so no warranty
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