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Variable Resistance Device

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mjac

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Is anyone familiar with Variable Resistance Devices? I have a piece of equipment that requires 240 volts at 30 amps and the only circuit available is 240 volts, 60 amps. How do these things work and how are they installed? It needs to be stone reliable, it is an $11,000 piece of equipment.

Thanks
mjac
 
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dogdog

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A electrical circuit not power supply wise, that is 240v 60 amp vs 240v 30amp is difference by wiring wise, bigger breaker and a different plug. Maybe talk to your electrician to make it a 30 amp circuit by changer the breaker and plug ?
 
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mjac

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A electrical circuit not power supply wise, that is 240v 60 amp vs 240v 30amp is difference by wiring wise, bigger breaker and a different plug. Maybe talk to your electrician to make it a 30 amp circuit by changer the breaker and plug ?
Not an option.
 

dogdog

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Again no such thing. What you are reading does not apply to your situation.

Again I don’t know your situation why you would not talk to an electrician to make it happen for you especially on a $11,000 piece of equipment. If you can not make a pigtail with proper fuse to convert your 60amp to fused 30 amp.

The fact that you are asking for a inline current limiting resistor or voltage dropper on a 240 v circuit is weird and googling an article that is for dc circuits and think otherwise says, you definitely should consult a real electrician instead of one over the internet.
 
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mjac

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Again no such thing. What you are reading does not apply to your situation.

Again I don’t know your situation why you would not talk to an electrician to make it happen for you especially on a $11,000 piece of equipment. If you can not make a pigtail with proper fuse to convert your 60amp to fused 30 amp.

The fact that you are asking for a inline current limiting resistor or voltage dropper on a 240 v circuit is weird and googling an article that is for dc circuits and think otherwise says, you definitely should consult a real electrician instead of one over the internet.
IMG_0877.png
 
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mjac

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Assuming you're not a troll, what is this mysterious piece of equipment?
That is quite an assumption. I ask a simple question, can a 240 volt 60 amp AC circuit be reliably regulated to 30 amps using something called Variable Resistance Devices of which there seem to be plenty including a Potentiometer which I am not familiar with and I get this? For your information, this “mysterious piece of equipment“ is a Picote Maxi Miller that mills the inside of up to 6” pipe and has to be used in various locations where the only power supply capable of running the machine is usually the 240 volt 60 amp circuit used for the electric range or dryer...Is everybody happy?
 

P0234

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I mean you could build a corded sub panel with a 30amp circuit breaker....
 
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mjac

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Reposting that same misleading site doesn't change reality.

What are you trying to power?

Why do you feel the need to limit the available current?
It is the first one that comes up, the first post was not just for DC circuits, it was also talking about AC circuits and the battery was just an example used. There seems to be several ways to reduce amperage in a 240 volt, 60 amp AC circuit despite your conclusion including rheostats, potentiometers and coils, all of which I am not familiar with. As stated above, this is to run a Picote MaXi Miller which mills up to 6” pipe and has to be used in various different locations where the only power supply capable of running the machine is the 240 volt 60 amp AC circuit of the electric range or dryer. The machine is designed for 30 amps, they usually use a generator on outside sites, but this is inside an apartment complex.
 

PCustoms

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That is quite an assumption. I ask a simple question, can a 240 volt 60 amp AC circuit be reliably regulated to 30 amps using something called Variable Resistance Devices of which there seem to be plenty including a Potentiometer which I am not familiar with and I get this? For your information, this “mysterious piece of equipment“ is a Picote Maxi Miller that mills the inside of up to 6” pipe and has to be used in various locations where the only power supply capable of running the machine is usually the 240 volt 60 amp circuit used for the electric range or dryer...Is everybody happy?
Well since you've finally provided some details we can give an answer.

Setup an enclosure with a 30A breaker, an outlet for your tool and a plug to match the stove/dryer.

A few additional comments:

  • In the US stove outlets are typically rated for 50A, and dryer for 30A. These are 2 different plugs
  • Generally, using a lower draw tool on a higher amp circuit is OK, especially for temp use
 

PCustoms

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And for anyone else tempted to Google this: it's a drain auger in the UK.
 
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mjac

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I mean you could build a corded sub panel with a 30amp circuit breaker....
The machine has to be used in various locations where the only power supply capable of running the machine is the 240 volt 60 amp AC circuit of the electric range or dryer.
 
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mjac

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Well since you've finally provided some details we can give an answer.

Setup an enclosure with a 30A breaker, an outlet for your tool and a plug to match the stove/dryer.

A few additional comments:

  • In the US stove outlets are typically rated for 50A, and dryer for 30A. These are 2 different plugs
  • Generally, using a lower draw tool on a higher amp circuit is OK, especially for temp use
These stove outlets in this 500 unit apartment complex are 60 amp rated, the dryers are commercial units.
I have 60 amps running naked to a 30 amp fuse?
 

PCustoms

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These stove outlets in this 500 unit apartment complex are 60 amp rated, the dryers are commercial units.
I have 60 amps running naked to a 30 amp fuse?
You know what, call an electrician.

As far as I know no one here is a UK electrician, and I can tell that people that are going to try to help you won't get anywhere.
 
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LXCam

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All you need is over current protection rated at 30amps. There’s no magic here. Get a simple fused or breaker disconnect. Get a male cord that matches your receptacle for the line side and a receptacle for your load side that matches your equipment which is probably an L630.
 

MAD

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Think about it this way: If you plug your 10 amp microwave oven into a 20 amp receptacle in your kitchen, do you need to insert a variable resistance device in the circuit to keep the microwave from drawing too much current?
 
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mjac

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And for anyone else tempted to Google this: it's a drain auger in the UK.
It is much more then a drain auger, very much more, it is a milling machine capable of milling rock, concrete, collapsed epoxy liners, iron ore deposits totally clogging the drainage system In up to 6” pipe. They have another model, Maxi Power Plus that mills up to
You know what, call an electrician.

As far as I know no one here is a UK electrician, and I can tell that people that are going to try to help you won't get anywhere.
This is not in the UK.
 

larry_g

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Can you link us to the machines factory manual and where you are getting the information that you have to limit the circuit to 30 amps or whatever your trying to do. To me it sounds like your trying to make some kind of a variable speed or power supply, which I don't think your trying to do. We have a lot of very experienced members here but we need good input from the OP and not what you think you need.. If you get defensive then your going to get ignored.
 

dogdog

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These stove outlets in this 500 unit apartment complex are 60 amp rated, the dryers are commercial units.
I have 60 amps running naked to a 30 amp fuse?
I don’t think you understand how electricity works. What ever site you are googling results on. It’s inaccurate. If you are unsure of the advise given here or don’t understand why, you can take these info and consult an electrician or EE “friends”. Electricity in UK, EU or US or even India are fundamentally the same. Other than how it is generate, grounded, distributed and frequency wise. I am referring to AC voltages of cause.

Maybe you can under stand this statement instead of googling sciencing site that seems to be giving misleading info

You have an equipment that is “capable” of consuming “up to” 30amp at 240volt ac power and wanted to used it on a plug or circuit that is “capable of supplying” up to 60amp of power….. your electrician or EE friend have the answer. Don’t trust the internet.
 

The Cobbler

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The representative from Picote stated that if the machine is plugged into a 60 amp circuit it would fry the control panel, that is what he said.
that's incorect info as far as I'm concerned ... to settle your concerns, get a cord to fit the 60 amp receptacle, add a 30 amp breaker to it , add a receptacle for the machine and you're set.
 

PCustoms

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It is much more then a drain auger, very much more, it is a milling machine capable of milling rock, concrete, collapsed epoxy liners, iron ore deposits totally clogging the drainage system In up to 6” pipe. They have another model, Maxi Power Plus that mills up to

This is not in the UK.
 
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mjac

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Why does it need to be regulated?

If a machine draws 30 amps, it will need a circuit rated at 30 or more amps. It will draw only what it needs, no more, no matter how big the supply is.

If it absolutely MUST not draw more than 30 amps, a 30 amp fast-acting fuse would very likely work.
As I stated above the “Global Learning Solutions Director” at Picote stated if the machine was plugged into a 60 amp circuit it would fry the control panel, that is what he said. He said the machines were designed to run off of 30 amp generators for outside, field use.
 

PCustoms

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Seems to me it would explode if hooked to a 240v 60A range circuit because it's only rated for 120v!
 
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P0234

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The machine has to be used in various locations where the only power supply capable of running the machine is the 240 volt 60 amp AC circuit of the electric range or dryer.
That's why I said corded.
 
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mjac

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Why does it need to be regulated?

If a machine draws 30 amps, it will need a circuit rated at 30 or more amps. It will draw only what it needs, no more, no matter how big the supply is.

If it absolutely MUST not draw more than 30 amps, a 30 amp fast-acting fuse would very likely work.
The Global Solutions Director at Picote told me the machines were designed to run off of 30 amp generators for outside field work and plugging it into. 60 amp circuit would fry the control panel. I mean, it is his machine and that is what he said. If the machine heats up, won’t I be constantly blowing fast acting fuses?
 

mike93lx

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The Global Solutions Director at Picote told me the machines were designed to run off of 30 amp generators for outside field work and plugging it into. 60 amp circuit would fry the control panel. I mean, it is his machine and that is what he said. If the machine heats up, won’t I be constantly blowing fast acting fuses?
It won't heat up. It will draw whatever it needs to draw and doesn't care if the circuit is 30az 40a, 60a or 200a
 
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