Bob:

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I work for a very large EC, the past 6 years in the division that handles warranty issues and I see no difference in the frequency of repairs between two wire and MWBCs.

But are you referring to connected equipment or the wiring system itself? In my case, only one of many experiences was due to wiring system failure (loose wirenut); all the other problems were despite the fact the wiring itself was o.k.

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But lets think about that, both of us have biases and neither of us did any real testing or logging.

Sort of. In my case, I never used a 'scope or power quality analyzer on the circuits, I just followed my instinct and pulled in the extra neutral. Wham, bam. Problem gone. Remember, my situation is usually noise, hum or erratic automation issues, along with occasional amplifier repeated failures. My file of old service reports (from only the last five years, though) was really the only logging. And admittedly, the percentage of neutral problem repairs in relation to my total workload is quite low, maybe 2% total. {Most cinema service calls are for mechanical breakdowns or non-power related sound issues.} I have a hunch your experience with this issue reflects about the same overall percentage.

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In other words our experience means little.

To each other, maybe. I like hearing of other's experiences, that's how I learn new things. To ourselves, I disagree. [Linked Image] We are, after all, in two different working environments. But we do have the same objective: a quality, cost-effective and trouble-free installation. [Linked Image]

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I am not picking a fight, I agree with Roger if you do not like MWBCs do not use them. I will continue to use them.

You are the last person I'd ever suspect of trying to pick a fight. [Linked Image]
But since I don't like MWBC's, I won't use them. They do have a place and proper application, my work isn't one of them.

As dnk said, good discussion!

edited to fix html

[This message has been edited by mxslick (edited 01-20-2006).]

Stupid should be painful.