On Sun, 29 Jan 2012 15:06:01 -0500, "Ralph Mowery"
wrote:


wrote in message
...
Hi all,

I have a 240V fused disconnect that I would like to use on a 120V
lathe. The disconnect has holders for two cartridge fuses, one each
for the 2 hots of your normal 240V circuit. If I used it for my 120V
lathe I could either run hot AND the neutral thru separate fuses
(which I wonder whether is a good idea) OR I could just run the hot
thru a fuse and leave the neutral continuous. What would be best?
Consider also I get a lot of lightning. I thought maybe running
neutral thru the fuse would be extra protection if lightning came up
thru the neutral. (I'm running the equipment ground continuous of
course, not fused.)

As others have said, do not fuse the neutral. Its connection is never
broken by anything that does not disconnect the hot wire also.

Run the hot wire through the fuze and connect the neutral direct without
going through a switch on the disconnect.

If worried about lightning, put a plug on it and unplug when not in use.


Here I was ASSuming the 240 disconect was already connected -

If it is just a 240 disconnect sitting on the shelf and he wants to
use it as a disconnect for 120, it is a totally different situation.
Use one side (L1 or L2) and neutral and leave the opposite line
connection disconnected.