Fuse needed for Disc?

[jonn46]

I'm Connecting (2) 10hp (30a Ea.) Pumps Into 0ne 3p Ckt. W/ 100 Brkr. Does My Disconnect Switch Need To Carry A Fuse. If So What Size?
These Are Domestic Pumps.

 

[petersonra]

why would it need a fuse?

perhaps three would be appropriate, but not one.

 

[haskindm]

100 amp sounds about right for the feeder for the two pumps. You will then need to install a branch circuit with proper protection for each pump. What voltage are you using? A 10 HP 208 3-phase motor would be rated 30.8 amps, at 230 volts it would be rated 28 amps. What is a domestic pump? SOunds like you need to talk to someone with some experience in wiring motors or at least spend some time reading article 430.

 

[ron]

What is the calculated short circuit current that is available at the disconnect switch? In many situations, the fault current will be higher than the withstand rating of a disconnect switch (no fuse). A fused disconnect switch has a much higher rating to comply with short circuit duties.

 

[LarryFine]

What is a domestic pump?

Why does that sound like a private matter between spouses?

 

[petersonra]

Originally Posted by haskindm
What is a domestic pump?

Why does that sound like a private matter between spouses?

I sense that you may discriminate against those who chose domestic arrangements other than traditional matrimony. I believe you should sign up for "the class".