220vac 1p to 110vac 1p
220vac 1p to 110vac 1p
(OP)
I have a 30 amp 220vac service receptacle (wired for a dryer but never used). I have a special need for a 30 amp, 110vac connection and would like to tie into this receptacle somehow.
There are three wires connected to this receptacle: Black, Red and Green (all insulated).
I checked voltages across wires and I get 220vac between the black and red, and 110 vac between black and green and red and green.
Can I use either the black and green or red and green (with no ground wire) to get 110vac safely?
There are three wires connected to this receptacle: Black, Red and Green (all insulated).
I checked voltages across wires and I get 220vac between the black and red, and 110 vac between black and green and red and green.
Can I use either the black and green or red and green (with no ground wire) to get 110vac safely?





RE: 220vac 1p to 110vac 1p
I understand that at one time, the NEC allowed a shared conductor for ground and neutral for driers and electric ranges.
However this gives rise to three issues;
The ground conductor is often smaller than the load conductors. For a 120 volt circuit the neutral must be the same size as the load conductors.
This code relaxation may apply only to driers and ranges and not to utility receptacles.
I believe that the code may have been changedg so that this practice is no longer allowed.
Using a ground for a neutral or a neutral for a ground is a code violation and a safety issue.
Taping the black or red wire with white tape at both ends, reconnecting it to the neutral bus and using it as the neutral is a violation of the rule that requires a neutral to be permanently identified for its entire length. Not a serious safety issue.
The proper way to do this is to either add a white conductor in the conduit or change the cable for one that has one white colored conductor in addition to the bare or green grounding conductor.
Alternately you may add a 240:120 volt transformer.
I won't suggest an installation contrary to code, but:
Many professionals would hesitate before taping a conductor white on a job that would be subject to inspection, but do it in their own homes.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 220vac 1p to 110vac 1p
RE: 220vac 1p to 110vac 1p
Keith Cress
kcress - http://www.flaminsystems.com
RE: 220vac 1p to 110vac 1p
RE: 220vac 1p to 110vac 1p
You also need to make sure the breaker running the remaining black wire is correctly rated for your new socket.
If you don't completely understand this entire discussion find someone who does, to help you, as working on live service panels is not a completely safe endeavor.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 220vac 1p to 110vac 1p
Get an electrician and pay him to do the right thing. A Lot cheaper than risking your limb or life.
RE: 220vac 1p to 110vac 1p
Can the 110VAC available on the ground wire happen to be there due to the induced voltage on it, with the other end of the wire not connected to anything?
Regards,
Engin
RE: 220vac 1p to 110vac 1p
The neutral is the center tap of the 240VAC power drop to the home. The middle of a 240VAC winding is going to provide one half of the voltage of the full winding, when paired with either end of the full winding. Hence the 120VAC,(not 110VAC),when either of the HOT wires are compared to the ground.
For safety reasons you must not use the ground wire for carrying any loads.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 220vac 1p to 110vac 1p
Good luck,
Engin
Good luck,
Engin
RE: 220vac 1p to 110vac 1p
RE: 220vac 1p to 110vac 1p
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: 220vac 1p to 110vac 1p
RE: 220vac 1p to 110vac 1p
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 220vac 1p to 110vac 1p
Most dryers that I have seen are in unfinished basements where the recep is surface mounted to a box on CMU/concrete wall with conduit used, if I can remember correctly (at least my house uses conduit for the dryer in the basement)
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: 220vac 1p to 110vac 1p
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 220vac 1p to 110vac 1p