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First twist together the wires to be joined. For larger wire use lineman's pliers to apply twist. Make the twist clockwise. Then twist on the wirenut clockwise on the wires. Wirenuts are rated as to how many wires of a certain size they can hold but in general twist by hand until you can twist no more and then about 1/2 twist with pliers. If the wirenut does not get tight it is too big or internal metal portion could be clogged in some way.
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Do wire nuts have to be inside junction box when installing porch lights?
The wire nuts do not have to be inside the junction box. They must, however, be as tight as possible to keep moisture from inside the light fixture.
Install light fixture to 6 wire?
usually you segregate them. all whites together all blacks together all non-coated copper wires and/or green coated wires together use wire nuts to connect above-mentioned wires together
What size wire to use to install a thermostat?
Use what is called bell wire or thermostat wire.
Why use 3 wire 240 volt receptacle instead of a 4 wire 240 volt receptacle?
Use the 4 wire if possible. You would only use a 3 wire for an old appliance.You shouldn't if possible. The 3 wire has no neutral wire as the 4 wire does. Som applications require the use of a 3 wire and some don't.
Can you use wire nuts inside a main breacker panel or to extend a new to an old knob to romax to breacker to include 220 volts?
There should be no joints like that inside the breaker panel. I'm pretty sure the NEC, or in my case the Canadian Electrical Code prohibits having any wire nuts/marrettes in it. Any such joints should be done outside the breaker panel in it's own junction box.
