The majority of the wiring diagrams for 240v controllers show a positive and a negative line - the 240v clothes dryer plug I'm going to use has 2 positives and 1 ground.
I'm building a 240v controller as outlined by Odessa's schematic in another thread - question is... what do I do with either A: the second positive lead or B: the ground?
My assumption would be to not use the second positive, but assumptions tend to end up with people releasing the blue smoke - better safe than sorry.
Thanks in advance.
Edit: 3 minutes of me getting off my ass and checking the outlet with a multimeter tells me I should merge the 2 positives together, as they're 120v/line. Correct?
Interpreting the various wiring schematics...
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Re: Interpreting the various wiring schematics...
Its the difference between SINGLE PHASE 240v and SPLIT SINGLE PHASE 240v.
UK uses a 240v hot wire, a neutral / return wire (earth) and a secondary grounding safety earth for fault conditions.
US uses centre tapped transformers to provide 2 hot wires each at 120v relative to earth and 180 degrees out of synch.
In countries whose standard phase to neutral voltage is 120 V, lighting and small appliances are connected between a live wire and the neutral. Large appliances, such as cooking equipment, space heating, water pumps, clothes dryers, and air conditioners are connected across the two live conductors and operate at 240 V, requiring less current and smaller conductors than would be needed if the appliances were designed for 120 V operation.
No individual conductor will be at more than 120 V potential with respect to ground (earth), reducing the earth fault current when compared to a 240 V, 2-wire system that has one leg (the neutral) earthed.
UK uses a 240v hot wire, a neutral / return wire (earth) and a secondary grounding safety earth for fault conditions.
US uses centre tapped transformers to provide 2 hot wires each at 120v relative to earth and 180 degrees out of synch.
In countries whose standard phase to neutral voltage is 120 V, lighting and small appliances are connected between a live wire and the neutral. Large appliances, such as cooking equipment, space heating, water pumps, clothes dryers, and air conditioners are connected across the two live conductors and operate at 240 V, requiring less current and smaller conductors than would be needed if the appliances were designed for 120 V operation.
No individual conductor will be at more than 120 V potential with respect to ground (earth), reducing the earth fault current when compared to a 240 V, 2-wire system that has one leg (the neutral) earthed.