[GreenKeys] Midget twist-lock connectors for power cords - reference

[John W9DDD]

One nit I would pick is that for the 7484, the middle pin is not for ground, but for the neutral conductor.  Yes it might eventually get to ground, but it is considered a circuit conductor back to the breaker (or fuse) panel.  Note rating of 15A 125/250V AC, 3 Pole, 3 Wire  vs 125V 2 pole for the 7593.

In other words the 7484 is designed for use on a 230 volt appliance and the 7593 for 115 volt appliances. That being said doesn't mean people may have used the 7484 on a 115 volt device incorrectly.

Did I manage to make a mountain out of a molehill or what?

John, W9DDD


> On Jan 30, 2022, at 5:38 PM, Nick England <navy.radio at gmail.com> wrote:
> 
> For future reference, 
> NEMA ML-3R 3-pin midget twist-lock female
> 1-11/64" diameter
> NOTE - The ground pin is FEMALE
> example - Hubbell 7484
> https://hubbellcdn.com/specsheet/WIRING_HBL7484_spec.pdf
> 
> NEMA ML-2R 3-pin midget twist-lock female
> 1-11/64" diameter
> NOTE - The ground pin is MALE
> example - Hubbell 7593
> https://hubbellcdn.com/specsheet/WIRING_HBL7593_spec.pdf
> 
> NEMA ML-1R 2-pin midget twist-lock female - 31/32" dia
> NOTE - no ground pin
> example - Hubbell  7464V
> https://hubbellcdn.com/specsheet/WIRING_HBL7464V_spec.pdf
> 
> Having opened my big mouth, I am now sure I have mistyped something - double check to be sure..........
> 
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
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