We have two 220v single phase 3/4 hp circulating pumps in a brand new Renal Dialysis Unit.The contractor wired the new pump with just a regular hospital grade switch.Five years ago I had installed one of these pumps at the old RDU that has been removed an is being installed as back up to the new pump.It looks like they are going to use a three position toggel switch rated at 277v 15 amp.When I installed the old pump the first time I put in a motor starter and disco as it was and will still be unattended. Is it ok to not use starters or O/Ls in this situation? Just saw this so I still have check the CEC.And what about the hospital grade swich?It would just open one line leaving the other hot.I can see a maint mechanic thinking the motor would be safe to work on thinking it was disconnected?
[This message has been edited by frank (edited 07-16-2003).]
