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Whats the difference between a "A" and "M"

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I know that schooling is a big difference, but besides that everyone tell me it's exactly the same. So why have two different grades?
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"A" Inside Wireman LU 134
100 Posts
An "a" classification can do anything from construction, to service, to maintenance, and low voltage communications work.

An "m" classification can typically only do maintenance and service. They are limited in the amount of new installation they can do.

That's my limited understanding. I'm sure someone else can better define it.
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