220 V wiring question

[John G]

300 volts is just enough for 120volt line. 240volt line needs 600 volt insulation I think.

[Doug Miller]

You want to explain that a bit?

[J. Clarke]

Lowes usually has them in stock for use with generator sets.

[J. Clarke]

The code does not address anything that happens from the plug plugged into the outlet on out. You're confusing requirements for permanently installed equipment with requirements for stuff that is plugged into the wall.

If your saw doesn't have overcurrent protection then your saw is a piece of shit.

Please identify a UL listed saw that does not.

The code doesn't protect anything with a plug on it.

And the electrician has no control over what gets plugged into the wall.

[zap]

Oh My My, I hear some truth here, and I hear some weird ideas here.

I am not an expert by any means, but having worked with electrical power and electrical circuits all my life, Up through 00000 gage wiring and copper bus bars, 100,000 amp motor generators, and 10,000 amp switches, and having rewound some motors, and rewiring several houses, I think that with close to 70 years of experience, that I am entitled to voice what I know to be true.

1. You will NOT melt the insulation from off of the wires by drawing more current through a wire than it can handle if it is fused (read that circuit breaker) correctly, for the fuse will open the circuit before any damage is done. The wire will not even heat up. And that is what the standards are for.

1. If a motor locks up for any reason, it will draw full current through it, even more current than when it starts, thus burning up the windings in seconds if the fuse does not open right away, or your thermal switch on the motor does not open. the reason - - When you first turn on the switch to the motor (the equipment type does not matter)there is applied across the windings the full electrical voltage and the resulting draw of current.(virtually a short circuit) But on this application, the motor starts to turn, and this results in a back voltage (reverse voltage) being created by the windings and turning armature, which then limits and reduces the apparent voltage across the windings to only one to two volts, which is what limits the current through the motor. This is what the windings of every motor is designed for. Under normal use, the actual voltage across the windings will remain in that one to two volt range throughout its normal usage, with its resulting current draw. It does not matter that you have 120 V. coming from the wall socket. (or

220, or 440 if designed for it)

1. It does not matter how much current or wattage a circuit is capable of providing, You will draw from that circuit only what the unit you are operating is designed to use, It is like you holding a water glass under the surface of a lake, it does not matter how much water the lake is capable of providing, you still will only get one glass full. . You cannot hurt it by running off of a Dryer, or electric range line assuming you are needing 220 volts.

Zap

J. Clarke wrote: