I was told about a week ago in this forum that you can have as many motors on a circuit as you want as long as you don't over load the circuit. So I'm looking at Article 430.53 and can't seem to find the part that says this. I do see that 430.53(A)(1) states something about each motor can not exceed 6 amperes. (A)(2) - about the short circuit and ground fault protective device not exceeding the controllers marking. (A)(3) that the individual overload protection conforms to 430.32. I look at the rest of this Article and am having a hard time finding this information about having as many as I want. Can someone help with this because sometimes I have a hard time finding these things. Unless it is as many 6 amp motors as I want.??? Thanks
Motors on a circuit???
- Thread starter tpd
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Not that simple!
Not that simple!
The two or more doesn't state as many as you want! There are guidelines as to when and how you can have two or more motors on a circuit and one of those is that they can NOT be over 6 amperes! It's best that if people can't give good feedback then they shouldn't give any at all!
Not that simple!
The two or more doesn't state as many as you want! There are guidelines as to when and how you can have two or more motors on a circuit and one of those is that they can NOT be over 6 amperes! It's best that if people can't give good feedback then they shouldn't give any at all!
kwired
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zbang
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It is semantically equivalent. It means two or greater, up to and including infinity, and I assume the number of motors you want is contained in the interval spanning two to infinity.
You will have trouble understanding logical statements, such as are found in the NEC and many other places. In view of that, I recommend you do not take a position on something and then dig yourself in.
kwired
Electron manager
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- NE Nebraska
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- EC
One situation I have run into before that is not specifically addressed in that section, is multiple motors on the same circuit that will not run simultaneously because the process they are a part of will never have more than one running at one time.
And if you can supply duty cycles, the avg. power draw and peak power draw for a small number (more than two, of course) of motors can be thrashed out using Excel, but it's tedious.
It's an interesting problem in probability and demand factor.
For a huge number of motors there are formulas, but the "never" puts an interesting kink in solving this. I'd guess I'd then ask, "Is there ever a time when no motors are running?"
I'll have to sleep on this one and then run up some example cases.
It seems that even with the NEC you guys are on your own in some cases.
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kwired
Electron manager
- Location
- NE Nebraska
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- EC
And if you can supply duty cycles, the avg. power draw and peak power draw for a small number (more than two, of course) of motors can be thrashed out using Excel, but it's tedious.
It's an interesting problem in probability and demand factor.
For a huge number of motors there are formulas, but the "never" puts an interesting kink in solving this. I'd guess I'd then ask, "Is there ever a time when no motors are running?"
I'll have to sleep on this one and then run up some example cases.
It seems that even with the NEC you guys are on your own in some cases.
In one instance we had ingredients being transferred to a weighing hopper, in order to successfully know how much of each ingredient is in the hopper you can only transfer one at a time or it will mess up the formula for the end product, there absolutely was only one motor running at at any instant on that circuit, otherwise something was wrong.
One at a time is easy, varying on-times or motor power consumption may make it a little tricky.
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