I've seen it done many ways but a 3 pole relay interupting the sub panel feeding the pumps works well. Making sure you interupt all conductors but grounding conductor. In your case assuming they are running off 110v you could get 2 normally closed 2 pole relays and use a panic button to open them. Mount the equipment in an area that isn't hazardous. Their is a standard on the panic button, has to be so many feet from but not exceed ??
[This message has been edited by walrus (edited 07-21-2004).]
