:smile: Hi fellas, most (if not all) of the elevators I have designed, have been wired 3-phase. Just moments ago a contractor approaching me asked me if it was permitted to wire an elevator with 1-phase power. I got right away into the NEC, and found nothing so far that prohibits this. I am aware that elevator motors are big (hence that is why most are 3-phase) What is your opinion on this fellas! Any comments are welcomed!!:smile:
1-PH or 3-PH for elevator??!!
- Thread starter l3city
- Start date
- Status
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I will be wiring a 30 amp single phase elevator for a residence in 2 days. They exist-- www.residentialelevators.com
1-800-832-2004
1-800-832-2004
rcarroll
Senior Member
- Location
- Fort Collins, Colorado
IMO, the whole dang world should be 3 phase. :grin: If the elevator is designed w/ a 1 phase motor so be it.
stickboy1375
Senior Member
- Location
- Litchfield, CT
I've done a few residential elevators in my day... single phase....
JohnJ0906
Senior Member
- Location
- Baltimore, MD
stickboy1375 said:
I have done a couple. Both were 240v, 1ph, 30 amp circuits.
Of course, you could only fit a couple of people in them.
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
There are significant disadvantages of using single phase power to supply a large motor (to me this means 1 HP and larger). But there is nothing in the code to prohibit it. Take a look at Table 430.248. It includes data for single phase motors as large as 10 HP!
The code does not tell us how to make design decisions, and this is a design issue.
The code does not tell us how to make design decisions, and this is a design issue.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Are these small hydraulic elevators with AC motors? The last elevators that we wired were all 3 phase MG sets to run the elevators on DC. Are we speaking about two different animals?
stickboy1375
Senior Member
- Location
- Litchfield, CT
infinity said:
Probably.... the one I did was in fact hydraulic...
JohnJ0906
Senior Member
- Location
- Baltimore, MD
rcarroll said:
3 phase, 4 phase, whatever it takes, right?
stickboy1375
Senior Member
- Location
- Litchfield, CT
JohnJ0906 said:3 phase, 4 phase, whatever it takes, right?
I prefer 2 phase myself...
eric stromberg
Senior Member
- Location
- Texas
rcarroll said:
I couldn't agree more. Just imagine how much less our air-conditioning bills would be if we replaced our 1 phase compressors with 3 phase compressors. It would also be better for the utility because the power demand is constant.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
eric stromberg said:
Would a 3 phase compressor be that more efficient?
stickboy1375
Senior Member
- Location
- Litchfield, CT
infinity said:
Never mind all the extra transformers the POCO would be supplying...
eric stromberg
Senior Member
- Location
- Texas
infinity said:
The short answer is Yes. I'm looking for some specific information so that i can create a chart that shows this. When i do, i'll post it.
eric stromberg
Senior Member
- Location
- Texas
stickboy1375 said:
True, but they could also start using three phase transformers that are mounted in a single case. Three primary bushings. I have a dream...
brantmacga
Señor Member
- Location
- Georgia
- Occupation
- Former Child
OP didn't mention whether this was resi or commercial; my question; do you guys think he would find a single phase elevator w/ commercial capacity if this in fact what he's looking for?
stickboy1375
Senior Member
- Location
- Litchfield, CT
splinetto said:
What do you think?
mdshunk
Senior Member
- Location
- Right here.
A guy was near me in the lunchroom in a factory at lunchtime one day last week. He had a hotdog from 7-11 that he was going to reheat in the microwave. It was wrapped in foil. He said to me, "This foil will be okay in the microwave, won't it?". Stunned that he would even ask that in this day and age, I said, "Sure". The guy stuck it in the microwave and fired it up. Pretty neat.splinetto said:
No. Your 3 phase motor will not work on single phase without a phase converter. The pump motor starts nearly fully loaded, so it will take a pretty generous phase converter at that.
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