Car Lift overloads required?

I was going to say never also. There are millions of these and every time it comes up its almost like it was invented yesterday.
 
If its for a customer,,, or yourself a nice touch or even uopsell is a 30A welder circuit (6-50-R) to it for smaller wire feeds. They use the same wire and breaker.
 
Eddie702 said:
Not sure if 2 pole starters are available or ever were. Very common to use a 3 pole starter for single phase. They tell you to use the two outside poles L1 & L3
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A starter is not required to break both circuit conductors so often a one pole starter is used for a single phase 240 volt motor.
 
Some days I wonder. Millions oif these sold that cone ready to hook wires too, all approved with safe stickers and listings. 2 guys in a thread of 20 grasp its ready to go,, 18 start to invent something new using 3 phase contactors and probably a dozen other gadgets if we let them. Sometimes I can feel ,,, there is a word for it,,,, especially when it gets technical,,, then there is a thread makes me wonder where they learned to do this work?
That is not to the OP, it was a good question and I wondered the first time I did one and might have asked Bob and Don on ETF.
 
Sberry said:
Some days I wonder. Millions oif these sold that cone ready to hook wires too, all approved with safe stickers and listings. 2 guys in a thread of 20 grasp its ready to go,, 18 start to invent something new using 3 phase contactors and probably a dozen other gadgets if we let them. Sometimes I can feel ,,, there is a word for it,,,, especially when it gets technical,,, then there is a thread makes me wonder where they learned to do this work?
That is not to the OP, it was a good question and I wondered the first time I did one and might have asked Bob and Don on ETF.
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Nothing wrong with the op wanting to add overload protection if he wants it. Whether required or not. Most I’ve seen are self contained, you just put power to it. Never bothered to look at whether it had built in overload protection because the controls were self contained, so I never had that question.
 
jim dungar said:
It was the OP that mentioned using overloads and possibly starters. We just tried not to derail the discussion.
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Exactly,
Who knew by the first post?
Maybe someone was stick building a car lift in their shop, and, we could have simply said:
MST02SN with a MSH15-6A Heater, or, something similar, which would have served as both the disconnecting means & the overload protection. :)

Oh well,,,

Jap>
 
jap said:
Exactly,
Who knew by the first post?
Maybe someone was stick building a car lift in their shop, and, we could have simply said:
MST02SN with a MSH15-6A Heater, or, something similar, which would have served as both the disconnecting means & the overload protection. :)
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I was going off this sentence from the OP.
Can't find any overload/starters that match this range, and am hesitant to start rigging 3 phase starters for single phase, as I hear often mixed success with this.
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jap said:
Never saw one that needed a Motor Starter.
The momentary pushbutton to start the hydraulic motor is on the side of the pecker head to raise the car.
The lever releases the hydraulics to lower the car.
Usually a head bar over the top with a N/C contact that you series the power through so it stops the motor should the car get too high.

All simple stuff.

Jap>
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Was going to post the same thing. I've hooked up a few of these and only brought line power to the machine. I think one of them had a control cabinet. All of them had the safety loop at the top to stop it if it is too high.
 
I have the lift in this thread,,, bud happens to have a Bendpak and it runs 120V. He puts a 25 ft 16 cord to it to "test" it. I am sure if he would have asked internet it wouldnt have worked for the last 30 years. Would have burned the motor out and the garage down.
 
The most a car lift hydraulic pump motor runs is about 30 seconds. You ain't tripping overloads before over current protection in that amount of time. That is definitely intermittent use. Overloads would be pointless.

We have a Rotary Lift brand in the shop that has a car 5' in the air in about 20-30 seconds. Up in the air, lower to the locks, and then it's there for a bit.
 
jim dungar said:
Overloads are not for when things work.
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Correct but in this application the duty cycle is short enough they would seldom ever trip. The control on these is a momentary push button that you have to hold to keep it running. If motor stalls or fails to start you either let up or if you hold button too long it is tripping the breaker before an overload device would trip. If it is simply overloaded, which likely isn't happening unless there is something wrong with the pump or possibly motor bearing issues, it doesn't have long enough run cycle to trip motor overload.
 
kwired said:
Correct but in this application the duty cycle is short enough they would seldom ever trip.
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The proper operation is not why the NEC requires overloads.
Overloads are need for when the motor pulls too much current for too long, maybe from a run switch that has been tied down or an upper limit that has failed.
 
jim dungar said:
The proper operation is not why the NEC requires overloads.
Overloads are need for when the motor pulls too much current for too long, maybe from a run switch that has been tied down or an upper limit that has failed.
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Maybe is good design? NEC doesn't require motor overload per the section I quoted in an earlier post, if the branch circuit device is no more than what it mentioned. Upper limit failure maybe depends on more details on how that situation turns out. Some may still load pump hard enough to trip branch breaker, some may simply damage top of the vehicle but not overload the pump. Any operator that ties down the run switch on something like this deserves whatever the outcome for their stupidity. I probably wouldn't want them working on my vehicle either as they apparently don't have much for mechanical knowledge. You don't have to understand the electrical behind this, but you don't "fix" whatever is controlling the pump in a way it can't be easily shut down here just like you don't "fix" the safety locks that keep the hoist from crashing down should there be a hydraulics failure.
 
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