Re: [CAD_CAM_EDM_DRO] VFD / phase converter

Ian Wright wrote:

> > carlos@... writes:
> >
> > I've placed small fans in the boxes and found I could dissipate
> enough
> heat
> > from a closed NEMA 4 box
>
> I may be particularly unintelligent or it may simply be that we do
> things
> differently on this side of the pond but I get confused by the term
> NEMA
> which many people use on this list. Can someone please educate me as
> to what
> is meant by NEMA and where I can find any suitable references to
> convert
> your system to ours? (Or perhaps you could just put in brackets what
> size
> 'Beezer' box you mean ;o) )

NEMA is the US National Electrical Manufacturer's Association, which has
standardized
all sorts of things, including the sizes of electrical equipment boxes.
So, this is just a box
of a standardized size, but there must be hundreds of different sizes in
the standard.
I'm not even sure NEMA 4 is a specific size, but just refers to a
specific class of boxes
in the standard.

Jon