Re: NEC-LIST: US metrics question

>
> >, so a ten meter long wall might be shown as 32' 9-11/16"
>
> [ 9-11/16" ], what's this ?? (anywhere between 9 and 11 devided by
> 16 ?, please excuse the stupid question)

You'd read that as: 9 and 11/16 inches..
 i.e. 9.6875 inches
This is a standard notation for such dimensions.. For instance, Autocad and
Visio will both format in this way. It's probably an ANSI standard, clunky
as it is..

The point of "fractional" dimensions is that they (theoretically) better
convey the precision involved..

If someone says to cut something to 8.125 inches it means something
different than to cut to 8-1/8 inches. The former implies a precision of
0.001 inches (fairly tricky), while the latter implies a precision of 1/16
inch (.0625 inches).
On the other hand, if you see a dimension like 8-1/2 (i.e. 8.5) inches, the
question is: is this supposed to be cut to 8.5 +/- 0.25 inches, or (because
all the other dimensions are accurate to 1/32) to 8.5000 +/- 0.03125
inches.. One could write the dimension as 8-16/32" to properly convey the
expected precision, I suppose.

This is complex enough that we actually have classes on dimensioning and
tolerancing!

>
> > What will you do for wire element diameters? Decimal inches would be
more
> > appropriate than feet.
>
> I had in mind to use both AWG and inches/mm.

-- 
The NEC-List mailing list <nec-list_at_gweep.ca>
http://www.gweep.ca/mailman/listinfo.cgi/nec-list