Wire size depends on amps. Use #10 for 30a. #8 for 40 or 50a. #6 for 60a.
That depends on the size of the welder.
A 240 V welder that is recommended to operate on a 30 Amp circuit should be wired with a 10 AWG wire.
6
20.8
A #12 copper wire is rated at 20 amps. On an extension cord, unless it has user installed ends, the rating of the three blade cap is only 15 amps. Either way the extension cord should only be loaded up to 80% of the wire rating. 20 x .8 = 16, 15 x .8 = 12.
A 15 Amp extension cord can be plugged into a 20 Amp circuit. It is important that what you're extending does not require more then 10-12 Amps.
If your extension cord is truly a 30 amp cord then it is composed of #10 wire. #10 wire is rated at 30 amps. All you have to do is remove the 30 amp plug and receptacle ends from the cord and install 15 amp cord ends.
Not simultaneously because the total current must not exceed 20 amps.
20.8
A #12 copper wire is rated at 20 amps. On an extension cord, unless it has user installed ends, the rating of the three blade cap is only 15 amps. Either way the extension cord should only be loaded up to 80% of the wire rating. 20 x .8 = 16, 15 x .8 = 12.
A #12 copper wire is rated at 20 amps. On an extension cord, unless it has user installed ends, the rating of the three blade cap is only 15 amps. Either way the extension cord should only be loaded up to 80% of the wire rating. 20 x .8 = 16, 15 x .8 = 12.
A 15 Amp extension cord can be plugged into a 20 Amp circuit. It is important that what you're extending does not require more then 10-12 Amps.
If your extension cord is truly a 30 amp cord then it is composed of #10 wire. #10 wire is rated at 30 amps. All you have to do is remove the 30 amp plug and receptacle ends from the cord and install 15 amp cord ends.
Assuming that the extension cord is plugged into a normal household receptacle rated at 15 amps the cord will handle 15A x 120V = 1800 watts. If the cord is of any length, at that wattage, you will feel the cord start to get warm like a heating cable.
Not simultaneously because the total current must not exceed 20 amps.
You can plug an extension cord into another extension cord. A extension cord is to help make doing something easier.
form_title= Extension Cord form_header= Install extension cords in your office. What size extension cord do you need?*= _ [50] What color extension cord do you need?*= _ [50] Do you need a 3 prong extension cord?*= () Yes () No
There are several variables:First and most important, what will be the current draw? If the total number of amps exceeds the rating of either the power strip or the extension cord you're creating a fire hazard.Second, the wire gauge and length of the extension are important. You will loose voltage over distance and that is a function of the current draw, wire type and wire gauge. If you're trying to run 20 amps, don't use any less than a 12 gauge extension cord up to a maximum of 100 Ft. 15 amps, minimum 14 gauge.
A 14 gauge extension cord can safely carry 15 amps, but not very far. Number 14 gauge extension cords are only rated for about 13 amps according to the labels on the cord. This is because the insulation is not intended to withstand the heat of currents above this level. Running this cord over 50 feet or loading it to 18 amps would be unacceptable.The likelihood of the cord maintaining the 18 amps for any amount of time for the high current to do any damage to the insulation of the cord is not very great. Extension cords are only an extension of the 15 amp wall circuit that they are plugged into. On overloading the extension cord by that amount the overload will trip the 15 amp supply breaker. An example of this is jamming a circular handsaw when it is plugged into the end of a 50 foot extension cord. The next action that is taken is to reset the tripped breaker.
You should know the maximum current drawn from the distribution box (in amps) and that must be less than the current that the extension cord is able to supply.