Groundmaster
Member
- Location
- brooklet,georgia,united states
124 volts
19 amp equipment on 30 amp overcurrent protection.
- Thread starter Groundmaster
- Start date
Groundmaster
Member
- Location
- brooklet,georgia,united states
We are pulling power from a Ericson spider box.
Groundmaster
Member
- Location
- brooklet,georgia,united states
The equipment is a torque motor, being fed from a Ericson spider box, the breaker is a 20 amp Siemens type QP HACR
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Is that the unloaded voltage or the voltage while trying to start?
rambojoe
Senior Member
- Location
- phoenix az
- Occupation
- Wireman
Wellp, there's the problem....
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Joe,
Can you explain why that's a problem?
rambojoe
Senior Member
- Location
- phoenix az
- Occupation
- Wireman
Yes, yes i can. When a op answers questions that begs 20 additional questions- its a problem...
- Location
- Illinois
- Occupation
- retired electrician
As long as the breaker temperature is not greater than 40°C it should hold 20 amps forever.
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Ok, we've established the following:
1) The voltage at the load when operating is 124V, so no excessive voltage drop.
2) The load is very likely the only load on the breaker.
3) The load is a motor.
We don't have:
4) Measurement of the actual current draw when the breaker trips.
At this point my first guess is that there is something wrong with the load, causing it to draw overload current, perhaps on the order of 30A on the basis of breaker trip time.
My second guess is a loose connection at the breaker (causing heat which will trip the breaker) or a defective breaker.
-Jonathan
1) The voltage at the load when operating is 124V, so no excessive voltage drop.
2) The load is very likely the only load on the breaker.
3) The load is a motor.
We don't have:
4) Measurement of the actual current draw when the breaker trips.
At this point my first guess is that there is something wrong with the load, causing it to draw overload current, perhaps on the order of 30A on the basis of breaker trip time.
My second guess is a loose connection at the breaker (causing heat which will trip the breaker) or a defective breaker.
-Jonathan
rambojoe
Senior Member
- Location
- phoenix az
- Occupation
- Wireman
Its a c.b. to a outlet (next to the panel?- 100' away?) w/a 50' 10awg extension cord to a spider box then a 12awg sow to the equipment.
Something tells me the volt reading is at the panel.
This means at best its plugged into a gfi or a protected 20a twist lock on the spider box.
Not exactly less that likely its the only load..
Thats not even getting into exactly what type of torque motor it is or the exact setup...
Something tells me the volt reading is at the panel.
This means at best its plugged into a gfi or a protected 20a twist lock on the spider box.
Not exactly less that likely its the only load..
Thats not even getting into exactly what type of torque motor it is or the exact setup...
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Ok, I admit I was making guesses based on the OP's description.
In post #21 they are asked if they measured the voltage at the end of the extension cord, and they answered 124V.
In post #22 and #23 when they described the breaker and the spider box, I _assumed_ that they meant the (very common but not universal) individual breaker for the receptacle yoke in the spider box. I also assumed that if the breaker fed more than one receptacle it would be obvious that there were other loads connected.
-Jonathan
Did we ever establish that the 124V was measured with the load applied or not?