In any case I am aware of in the US for normal 120V 20A or 30A single phase equipment, the plug is an acceptable disconnection means. And it is normally "visible from the operator's position" as required. The disconnect is intended as a positive disconnection of power for servicing, not an "emergency switch".
<font face="Verdana, Arial" size="2">Originally posted by Thrud:
Also consider that in most locales wiring of "portable machines" like this may be costly as it may require a fusable disconnect at each machine as a an emergency shut off - you must comply with local and national electrical codes to insure that your insurance is not cancelled in the event of fire or mishap. Otherwise the machine has to be hard wired to the circuit making mobility impossible.
The circuit protection (fuse or CB) is adequate protection for the wiring etc. And, you can always put a fuse at the machine if desired.
If you have a 440V 3 phase machine, you normally can STILL use a properly rated plug, if one is available.
If you have a special circuit for the machine, and more than a 30A CB, you may be required to put in a visible. lockable disconnect and hard-wire. But that isn't a "portable" machine situation.
I would suggest a GFI, they add safety on a normal basement or garage situation, and regular motors etc should not trip them. My whole shop is GFI protected, and I have never had one trip from a machine. From a newfangled electronic ballast flourescent light, yes (got rid of them, back to iron ballasts!)
[This message has been edited by J Tiers (edited 01-06-2005).]
Keep eye on ball.