Booster pump

[hhsting]

I have domestic water booster pump 480V, 3 phase with (3) 15HP motors being fed by single 90A breaker size.

I am not sure but is 90A breaker correct size? Would 430 or 422 come into play? What would be correct breaker size?

 

[augie47]

Art 430 would apply.
Ate you askimg about the feeder breaker for all 3 pumps ??
You tell us what breaker you think would be correct and based on what Code Section !! (Only way you will learn)
Then we will comment

 

[hhsting]

Art 430 would apply.
Ate you askimg about the feeder breaker for all 3 pumps ??
You tell us what breaker you think would be correct and based on what Code Section !! (Only way you will learn)
Then we will comment

From switchboard I have branch circuit breaker feeding the booster pump that contains or has quantity 3 15hp motors.

430.52?

 

[hhsting]

Art 430 would apply.
Ate you askimg about the feeder breaker for all 3 pumps ??
You tell us what breaker you think would be correct and based on what Code Section !! (Only way you will learn)
Then we will comment

I have 90A breaker from switchboard to domestic water booster pump model Alyan VSPMT-275115-3-15, qty (3) 15HP located in Fire pump room. Its triplex pump all tie to control panel. All can be run same time. Do I use one motor or all motor to size breaker?

Is it 430.52?

 

[tom baker]

Make model does not matter, need name plate data.

 

[hhsting]

Make model does not matter, need name plate data.

Its not installed in field. All the items I post they are on plans. However this booster pump triplex is new

Schedule for it just shows (3) 15Hp, 480V, 3 phase, 60Hz thats all

 

[don_resqcapt19]

See 430.24 and Part V of Article 430.

 

[tom baker]

That is submittal data and not name plate. See 430.24

 

[augie47]

Is it 430.52?

430.52 would be correct for the individual pumps, 430.62 for the feeder breaker.
You need to look at 430.52 1st and then 430.62 for all 3

 

[augie47]

Other than showing the correct method for calculating the breaker, this may all be a moot point anyway.
If you are reviewing electrical plans, what size conductor is the 90 amp breaker protecting ??

 

[tom baker]

That is submittal data, not name plate. See 430.24

 

[tom baker]

In my state, we only have this level of plan review for hospitals and schools. The field AHJ looks at and approves

 

[Jraef]

The single 90A breaker in the distribution panel cannot be the branch SCPD for those individual pumps, it is a feeder to them. Assuming, because it is a “triplex” pump panel, that they are operated from a control panel, each pump controller would require its own branch SCPD (breaker, fuses, motor protector). Hopefully that’s what they are providing and if so your breaker will just be a feeder. If not, and they want 3 non-combination starters hanging on the wall all protected by just that single 90A breaker, that isn’t going to fly.

 

[NTesla76]

Pardon my ignorance if this has been mentioned before, but what is your involvement in the electrical field, hhsting?