Motors
- Thread starter wijeguna
- Start date
- Status
- Location
- Massachusetts
Re: Motors
The conductors are sized to the motors full load current. (from the tables)
As are the motor overload devices. (from the name plate)
If the motor starts to draw more current then it s designed to the motor overload devices open before motor and conductor damage occur.
The conductors are sized to the motors full load current. (from the tables)
As are the motor overload devices. (from the name plate)
If the motor starts to draw more current then it s designed to the motor overload devices open before motor and conductor damage occur.
- Location
- Illinois
- Occupation
- retired electrician
Re: Motors
The branch circuit breaker or fuse provides the ground fault and short circuit protection for the conductor. The motor overload protective device provides the overload protection for both the motor and the conductor.
Don
The branch circuit breaker or fuse provides the ground fault and short circuit protection for the conductor. The motor overload protective device provides the overload protection for both the motor and the conductor.
Don
Ed MacLaren
Senior Member
Re: Motors
The overload relay (or switch) setting (or heater selection) is typically 125% of motor full-load amps, and so is the required conductor ampacity.
The conductor is protected by the overload device.
Ed
PS - Don and Bob type real fast.
[ December 11, 2003, 06:38 PM: Message edited by: Ed MacLaren ]
The overload relay (or switch) setting (or heater selection) is typically 125% of motor full-load amps, and so is the required conductor ampacity.
The conductor is protected by the overload device.
Ed
PS - Don and Bob type real fast.
[ December 11, 2003, 06:38 PM: Message edited by: Ed MacLaren ]
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: Motors
wijeguna
There is a relationship between branch circuit conductor sizing and short circuit/ground fault protection device sizing for motors.
Just look at table: 430.52 Maximum Rating or Setting of Motor Branch-Circuit Short-Circuit and Ground-Fault Protective Devices.
But it depends on what type of motor that's being protected.
wijeguna
There is a relationship between branch circuit conductor sizing and short circuit/ground fault protection device sizing for motors.
Just look at table: 430.52 Maximum Rating or Setting of Motor Branch-Circuit Short-Circuit and Ground-Fault Protective Devices.
But it depends on what type of motor that's being protected.
- Status