Voltage Reversing

[Danfossegypt]

hello Gents.

i had a what i think very simple question.
i am designing a heater, the heater will finally have a plug like any apparatous, as you know the plug may have two position so, the 220 volt will be swapped to my heater,i.e i will get 220V instead of the neutral. what shall i do to prevent this???

 

[dpc]

Depends on the type of plug and the electrical system you are plugging into.

In the US, swapping the two 220V connections will make no difference because they are both "hot".

 

[felixc]

Is the element going to be isolated from everything else?

Since your device is going to be connected in a standard socket, the people who will certify your product (I presume that you will want it to have a UL, CE, or CB on it) will have the last word on what is safe to do.

 

[IRstuff]

The simplest solution is to ensure that neither side has an accessibility to the end-user, particularly since there is already a potential issue of thermal burns.

TTFN

 

[itsmoked]

Anywhere you or your enclosure can touch the heater element would provide a point for being shocked/electrocuted. So your entire system must be electrically isolated. Whichever side is hooked to a neutral really makes little difference.

 

[VEBill]

If 'Danfossegypt' is a Mr. Dan Foss in Egypt (where they do use 220v, 50Hz AC), then the standard power plug in Egypt is a two-pin plug (Type C) that can be plugged in either way (both pins the same).

Ref (scroll down for Egypt):

http://kropla.com/electric2.htm

Therefore, power reversal mustn't be a real problem since everyone would have the same issue for everything. Thus, all the above advice probably covers it off very nicely.

But certainly consult the local codes.