[Amps] 240 Volt Blowers needed

Jeff DePolo jd0 at broadsci.com
Mon Mar 20 18:15:25 EDT 2017

> I don't know of current Code that permits a circuit that lacks an 
> equipment ground conductor run with the current-carrying conductors. 
> That sort of thing was permitted in much older Codes, and old 
> work is, 
> for the most part, grandfathered. 

As I said, it is applicable to existing installations where the branch
circuit doesn't have a separate EGC, but the appliance presents both 240V
line-to-line and 120V line-to-neutral loads.  It's not applicable to new
work.  The general premise is that rather than letting the chassis "float",
and thus afford no path for fault current, NEC says to bond the neutral to
the frame.  See 250.140.

> But it remains a really bad  thing. To 
> understand one reason why this is bad for ham radio (and 
> component audio 
> systems), see Slides 122-129 in this link, which are slides 
> for a talk I 
> did at Pacificon last fall and will do at Visalia next month. There's 
> also a safety issue.

You're preaching to the choir.

					--- Jeff WN3A

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