Water pump with a stinger

Delta8

Member
Location
Santa Rosa California
Occupation
Electrical contractor
there is a well pump that is 1.5hp 3phase. it is 120/240v with a stinger at 208v.
will the pump still work on a 120/240 3phase delta system with no stinger?
 

Delta8

Member
Location
Santa Rosa California
Occupation
Electrical contractor
it is a 3 phase motor 120/208. The utility voltage coming in is 3ph 120/208 with a "high leg" or "stinger". the question is... will the motor for the pump still work on a 120/240 volt 3ph.
 

oldsparky52

Senior Member
there is a well pump that is 1.5hp 3phase. it is 120/240v with a stinger at 208v.
will the pump still work on a 120/240 3phase delta system with no stinger?
it is a 3 phase motor 120/208. The utility voltage coming in is 3ph 120/208 with a "high leg" or "stinger". the question is... will the motor for the pump still work on a 120/240 volt 3ph.
Those highlighted voltages are suspect.
 

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Electrician
it is a 3 phase motor 120/208. The utility voltage coming in is 3ph 120/208 with a "high leg" or "stinger". the question is... will the motor for the pump still work on a 120/240 volt 3ph.
You don't have a high leg or stinger with a 120/208 service. It would have to be a 240/120V Delta to have a high leg/stinger.
 

tom baker

First Chief Moderator
Staff member
Will a 208 wye motor run on a 240/120 delta?
Yes but the higher voltage will saturate the windings, the result being more current draw, per NEMA. A motor that is designed to run on a 120/208 volt system will have a name plate rating of 200 Volts. NEMA motors are designed with a +/- 10% voltage tolerance. 10% of 240 is 24 volts, 240-24 = 216 volts.
 

Hv&Lv

Senior Member
Location
-
Occupation
Engineer/Technician
Will a 208 wye motor run on a 240/120 delta?
Not for long, if it manages to turn at all.
A 208Y motor on 240 delta?
I expect it will go poof when the disconnect is turned on.
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Not for long, if it manages to turn at all.
A 208Y motor on 240 delta?
I expect it will go poof when the disconnect is turned on.
While not a good idea, it will not go "poof" when the disconnect is turned on. It will run for some time before it fails from over voltage.
 

tom baker

First Chief Moderator
Staff member
Certainly it will work but you will experience shorter motor life due to the higher voltage past the 10% maximum. Can you measure the amps and what are the nameplate amps?
What is the nameplate rated voltage, 200?
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
there is a well pump that is 1.5hp 3phase. it is 120/240v with a stinger at 208v.
will the pump still work on a 120/240 3phase delta system with no stinger?
Absolutely. The 208v "stinger" has nothing to do with the motor; that's a characteristic of the supply. It is only a 240v, 3ph load.

A high-leg delta supply is a 120/240v 1ph supply superimposed on a regular delta 3ph supply; it has the characteristics of both.

To a 3ph-only load, the line-to-neutral voltages are irrelevant. As long as the load is rated for the delta voltage, it will work fine.
 
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