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Why does some automotive toggle switches have just two prong for power and some have three for power and ground. Is the ground necessary when what you're wiring is already grounded?

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The switch with two prongs is a single-pole, single-throw switch; it is either on or off. AmanStino Lightning Cable Apple MFi Certified 1M Nylon Braided Charging...

Posted on Jan 05, 2017

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The switch with two prongs is a single-pole, single-throw switch; it is either on or off. The switch with three prongs is likely a single-pole, double-throw switch. That is, it controls two circuits but only one can be on at a time. For instance, it could control a two-speed fan with one position being low and the other being high. The "ground" you speak of is the common terminal and may or may not be connected to ground. You can find more information by searching for SPDT and SPST switches on Google.

Posted on Jan 05, 2017

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1 Answer

4-prong to 3-prong Power Cord Conversion.


On a 4-prong power cord you have 2 hot wires, one neutral wire, and one ground wire. On a three prong cord, you have 2 hot wires and one neutral/ground wire. The difference is the on four prong the neutral wire goes to electrical neutral bus in the breaker panel and the ground wire goes to the ground bus in the breaker panel. Since the neutral and ground buses, although separate, both go to physical ground, on a three-wire setup, you are just putting the neutral and ground wire together, Most dryers actually have a place at the pigtail connection to do just that.

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I need to switch my three prong power chord to a four prong


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1 Answer

Four prong plug to three prong plug


Kalola,
You can if you want to, but it's not generally necessary. Here's a picture of a 3 prong configuration with a ground strap...
df8caf5.jpg

That green wire with the yellow stripe is a ground and it is most definitely connected to the cabinet somewhere. So it will serve as the ground strap (in the above picture).

Here's the thing... say you were going from a 3 prong to a 4 prong. That is, the dryer was originally "designed" for a 3 prong. This means you'd have to "retrofit" it a bit. Take a look at this pic... ( I made this for someone else, so please disregard my somewhat hostile remarks, OK?)
22c744f.jpg

The ground strap has been removed and has been replaced by the ground to the frame. Yours probably does NOT have a ground strap, though... yours uses that Green/Yellow wire for frame ground.

All of that to say this. Don't lose sleep over it. Ya done good.

SG

b3b18a1.jpg



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1 Answer

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to change to a three prong plug the ground must be sacrificed but with shock risk. i suggest a seperate ground wire run to an adequate ground.
a typical three prong plug will mean that the two prongs closest to the edges are the two power leads and will use the red wire on one and black wire on the other.(doesn't matter which one goes on which prong)
the white will go to the center or usually odd shaped prong. be sure and be safe!
hope this helps.......................jay

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1 Answer

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