control boards in modern appliances

[bud--]

Why "must" electronics withstand 600V. There is no standard. People in repair newsgroups say some electronics has protection and some does not. That is also what I have seen.

Protection that is often used is a MOV from line to neutral (and sometimes MOVs to ground). But according to w that can not possibly work - there is no less than 10 ft connection to an earthing electrode.

Wow - you used "if".

What we don't know: Is OP in a high lightning area? Lightning around the time of failures? Other major surge sources? What protection was provided by the manufacturers? What is the electrical system earthing? Is there a neutral-ground bond at the service? Loose neutral? Schlocky wiring? Coincidence?

I give up. What do you think happened in the 1990 NEC?

[krw]

Certainly you have, liar.

I'm glad you came back to this discussion, admitting that you are a liar.

Irrelevant.

Why? You don't like getting caught in your lies?

[salty]

Your only "argument" is to call me names. That's because you have nothing else. You shot your mouth off on a subject that you know little or nothing about, and then couldn't figure out an escape route.

[keith]

It's hard to do anything else since you constantly change the subject, liar.

[salty]

On Thu, 30 Sep 2010 09:58:50 -0700 (PDT), keith wrote:

[keith]

What a liar, saltydong.