[aprssig] Generators, grounding, recessed male twistlock, etc.

Joe Della Barba joe at dellabarba.com
Sun Feb 5 14:41:48 EST 2006

I used to be in the marine electrical/electronic business. Generators on 
boats always had the neutral connected to the chassis of the genset as 
well as the ships ground. Another requirement was that there would be NO 
breakers or switches in the ground lead.

Jim Lux wrote:

> Folks:
> I would imagine that checking any decent industrial catalog (grainger, 
> msc, mcmaster) would turn up whatever plug or receptacle you're 
> looking for. They may not be cheap, however; The less commonly used 
> wiring devices often are substantially more expensive (as in 3x-4x) 
> than the common ones.
> As far as generator grounding goes: There are very, very different 
> rules (and they're generally based on common sense, so it's not just 
> pointless regulatory overhead) for temporary generator grounding and 
> generators used for standby power (e.g. with a transfer switch).  For 
> example in some cases, the Neutral and Ground are connected at the 
> generator, and in others, they must not be connected.  It all has to 
> do with where the fault currents go: you don't want the neutral going 
> hot relative to ground, nor do you want load current flowing in your 
> grounding system.
> The point is, don't go blindly applying a solution intended for one 
> application (construction site power) to another (home emergency power 
> or digipeater remote site standby power).
> There are a number of informative sites on the web that have "good" 
> information on this: http://www.mikeholt.com/ is a good one for 
> electrical code and practice kinds of questions.  The problem with the 
> web is that there are equally many sites with bad, out of date, or 
> dangerous information. Throw things like battery power and inverters 
> into the mix, and it can get complex.
> Or, even better, consult with someone who makes it their job to know 
> this stuff.  Ask for specific electrical code references and a good 
> explanation of why they suggest the particular implementation.  
> Investing a bottle of wine, or a favor, or even some hard earned cash 
> in a consultation might be a worthwhile investment.
> Jim, W6RMK
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