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<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by josmith: Rat shak is an example of cheap but not inexpensive. I've seen one of there meters die of an internal arc on 480vac,well within the rated maximum. <hr></blockquote><p>T...

Is the motor merely hot to the touch? Many motors are rated for a 40^C rise over ambient temperature. In other words what feels hot to your hand is nothing for class B insulation which is rated at 130^C. All may be well. If you could post the motor nameplate data I may be able to tell you more.<p>[ ...

A) The motor is constantly at reaching stall load<p>That would have to be the #1 reason for failure since they are so easy to overload and with the only real overload protection being the tool's getting too hot to hold on to. And those cheap Asian import tools don't help the matter much at all. I ha...

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by no_vice: You should never use any inductive motor load on less than a 14ga. cord. AND DON'T GO BY THICKNESS! READ THE CORD! Many "Homely Despots" sell 16/3 cords that ...

That "vibrator" is what's commonly called an "Instrument Voltage Regulator". Its job is to reduce the 12 VDC supply to a pulsed 6-7 VDC. If it sticks or someone bypasses it the end result is looking for a new gauge.

A simple solution would be to install the float in a well. To further clarify, install the float inside of a larger tube/pipe extending into the tank or sump, this will isolate the float from disturbances in the tank or sump. We use this method in our cooling water sumps at my plant.<p>[ April 11, 2...

What you need is a UPS. The smaller ones are not that expensive anymore, the biggest factor being how much uptime do you need.

I have used this site a few times, give it try.<p> http://www.relic-servis.com/linkovi/Search.html

The biggest limit deals with not loading an overcurrent device to 100% unless listed for that use, which I do not know of any listed at this time, so your limited to 80% which equals 1440W (15 amp) and 1920W (20A). Hair dryers are typically used in the bathroom which is required to be served by a de...

You may want to look for the text book "Programmable Logic Controllers" by Frank Petruzella from McGraw-Hill. It focuses on the slc 500 series. I often use it as a reference even with other systems.

You may only load to 80%, therefore at 120V your maximum permissible load would be 1440W.
Some sections to look at: 2002 NEC
110.3 (B) Installation and use.
210.19 (A)(1) Branch Circuits not more than 600 volts. 210.20(A) Overcurrent protection.

An oil burner ignition transformer will give you an easy 6000 - 10000 V with a 120 V input. Could easily vary the output by changing the input.

A better bet would be to use a compound wound or a stab shunt field motor. That would give you good speed control and torque with only tach feedback.

Maybe yes, Often you can run a 120 VAC coil on about 24 VDC without too much trouble. With 14 VAC coils on DC you'd be looking at adding a good deal of series resistance to limit the current. Another possiblility could be a reduced voltage with series resistance also.

I agree with digitech, make them buy their own meters and the problem will be solved shortly enough.