How To

What do you think of this?


I’ve always been curious about the two holes on ungrounded NEMA 1-15 plugs (Type A). There they were, one hole on each blade — what were they for?

When I had to make an electrical connection inside a junction box a few days ago, to power up a little adapter for a network camera, I thought: why not get some stubby hard drive screws (short machine screws used to afix HDs to drive bays), crimp a couple of ring terminals onto the hot and neutral wires and see if I could screw the terminals onto the adapter blades  with the hard drive screws? There are no screw threads inside the blade holes, but if you turn the screws a little harder, they’re just the right width that they’ll make their own way through and the whole thing will be quite snug.

Of course, the job isn’t complete without isolating both connections separately with electrical tape, or even better, with heat-shrink sleeves, but that’s easily enough done. The last step involves placing the whole thing inside an IP 56 junction box, for extra safety.

I think it’s a fun and novel way to get power to these little adapters. What do you think?


5 thoughts on “What do you think of this?

  1. I’m guessing the holes are for alignment when they overmold the plastic housing. Just a guess. Otherwise, some type of alignment function.

    I think what you did would work fine, covering w/ heat shrink would be a really good idea. But, if I were going to do that, I’d buy a receptacle for a cord end and plug into that. Such as one like this:

    Or, something like this in your box:

    The problem w/ this last one is that you need a square hole, that kind of stinks unless you have the right punch and who has that!?



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