Re: Coil Form needed 2

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Jim Lux <jimlux-at-earthlink-dot-net> 

At 08:14 AM 5/21/2004 -0600, you wrote:
>Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com>
>Schedule 40 doesn't signify that it's pressure rated.
>Schedule 40 PVC conduit is nonmetallic rigid
>electrical conduit, and clearly isn't intended for
>pressure applications. It's fine for secondary forms
>though.

Actually... Schedule 40,80, etc. refers to water pipe, which is pressure 
rated, but more particularly, it refers to the physical size, i.e. the wall 
thickness.  The OD of the pipe is the same for Sch 40, 80, etc., so that it 
fits into the same fittings.

Rigid Electrical Conduit follows water pipe OD sizes (that is, 1/2" rigid 
conduit has the same dimensions and thread as 1/2" water pipe), but doesn't 
necessarily have the same ID or wall thickness or most important, 
bendability.  Rigid conduit is intended to be bendable and formable, while 
water pipe is not (i.e. water pipe is originally black iron pipe, 
notwithstanding that you see a lot of galvanized pipe around, particularly 
in smaller sizes).  Water pipe also often has a more obvious weld seam down 
the inside, while electrical conduit usually does not.

When it gets to PVC electrical conduit vs water pipe, the physical 
dimensions of the outside are the same, and, as a practical matter, the 
wall thickness of PVC conduit is the same as Sch 40 water pipe, but I 
wouldn't expect that this necessarily is mandated.  For water pipe, the 
burst strength is important (so one could have a very strong, but thin 
wall, and still call it Sch40, assuming it could be tapped with a standard 
pipe thread and not fail). For electrical conduit, it's the wall thickness 
and mechanical crush strength that are important.

The various schedules are different for various kinds of pipe (Cold water, 
DWV, and SDR)


You think pipe sizes are bad, take a look at paper basis weights...



>Also, there's nothing wrong with SDR35 or the thiner
>stuff for smaller coils. My 10" and 16" forms are
>schedule 40. My 8" is SDR35. My 4" is thin walled
>drainage pipe. I'd definitely avoid the cellular core
>stuff though.
>
>Adam
>
>--- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "bill wilson" <wtw-at-tampabay.rr-dot-com>
> >
>
><snip>
>
> > schedule 40 pvc is pressure rated. it is used for
> > water lines and drainage.
>
><snip>
>
> >you ned schedule 40 or higher for tesla
> > coil use