Question about Sewing Machines
The two prong lamp plug that came on my sewing machine is not polarity specific. One of the three leads is reading continuous to the frame so if you plug in the two prong plug upsidedown you'll have 110v on the frame. Of the three wires one has and outside ridge, one is center, and the other outside is smooth. Center=continuity to frame, outside with ridge=continuity to foot control, and outside smooth continuous to machine but I'm not sure where. As an electrician I would make the ridge identified wire the neutral but this would have the foot controler operating the neutral. Would like to know how the factory installed the plug end on the three wire lead to the wall and see if it works. I'd assume with a three prong plug but at the very least a two prong plug with one wide prong for neutral to avoid shocking someone.
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Posted on Jan 02, 2017
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...
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?)
The ground strap has been removed and has been replaced by the ground to the frame.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.
Posted on May 02, 2009
IF you find that you have only a 3 wire feed for this dryer (and the
reason for the 3 prong receptacle)...then you can not properly install
a 4 prong dryer cord to it. You now have 2 choices....either rewire
(assuming that it is a 3 wire supply) the entire run from the dryer
breaker to the outlet location with 4 wire (typically a run of 8/3 with
ground having a black, red, white and bare ground)and install a 4 prong
dryer receptacle to match the configuration of the new dryers
cord.....OR - you can remove the 4 wire cord and replace it with a 3
wire cord....re-using the ground strap - IF it is still in place.
Posted on Jul 11, 2009
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