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Re: Do we need grounding?
tortuga
30 minutes ago
One other thing the NEC allows [ 250.130(C) ]is running a independent ground wire, such as a #10 AWG green, back to the grounding electrode system. This can be a good option when the ampacity of the branch circuit is sufficient for the load and you just need a grounding type receptacle, such as a old 3 wire NM 10/3 cable for a dryer can be converted to a 4-wire NEMA 14-30.
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Re: 240V only in a home and NEC?
tortuga
Yesterday at 08:29 PM
The grounding/Neutral system will not make any problems, many European places do still use a 230V system without a Neutral. Y transformer with 230V between the legs does have approx 130V from each leg to ground. Where you are (in Norway?) do you tend to see more 400Y/230 or 230Y/132 utility distribution systems?
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Re: 240V only in a home and NEC?
dsk
Yesterday at 06:58 PM
I like your GFCI solutions, the look of the NEMA oulets are nicer then the typical European outlets, but maybe not as saferegarding the risk of touching the metal parts of the plugs that may visible when the plug just is almoast plugged fully in. The totally safest outles may be a third standard, the new South African std seems to be great. Adapters are generally a risk, so keeping the national standards will still be the safest.
My conclusion of this thread will be that Europeans moving to USA may change their plugs, and get 240V outlets for equipment they want to keep, but the most will probably be best to replace with local standard units.
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Re: 240V only in a home and NEC?
tortuga
Yesterday at 05:40 PM
If you do want to use equipment from Europe in a residence one thing to keep in mind is their standards use a 'RCD' residual current device in the breakers or what I call a class B GFCI manufacturers now call it Ground fault protection of equipment (GFPE), with a 30ma ground fault trip instead of our 5ma. I learned about this years ago when working with commercial espresso equipment, the manufacturer in Italy got their equipment NSF/ ETL certified in the US and Canada but you still had to use those GFPE breakers per the listing. Now that the NEC requires GFCI in commercial kitchens they are just on a GFCI breaker.
So in a residential setting where a GFCI is required you'd need a 2 pole GFCI and where one is not required I'd recommend using a 2 pole GFPE breaker, Siemens and Eaton do still offer them for their plug on load-centers.
I would not recommend using NEMA receptacles, as there is more possibility of the end users messing up the cords cutting and re capping all their appliances. I'd try find some suitable Shukos' that mount on a regular 2 gang box, never looked but you might even find some ETL listed ones. Also I would not worry about Line to Neutral or Line to Line, Line to Line here in the US would just limit the maximum potential to earth to 120V. Its just more expensive as you need 2 pole breakers and switching. Cheers
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