Pham Van Hung
Member
Hi all,
I have a controversial problem and need your helps for clearification.
0.4 HP single phase motor at 220-230V AC, 50Hz,
Rated current (marked on motor nameplate): 2.2A
PF: >0.9
My questions are:
- The rated current (2.2A) is the full load ampere (FLA) of the motor?
- Can NEC? 2008 table 430.248 (NEC? 2002, this is 430.148) be apply for this? and if yes what is FLC of 0.4HP single phase motor at 230V?
- I also heard about lock rotor current (LRC), what is it used for?
As per my understanding, FLA is the rated current marked on the motor nameplate (motor rated current at rated voltage and rated load).
FLC is motor current specified in NEC for safety purposes and for short circuit and ground fault protection device selection. Usually, FLC is bigger than FLA. LRC is for maximum current of motor when it is connected to rated voltage and load and the load is hold unmoved.
Another question. Is the following true?
"When you connect one motor A-B, and another [identical] motor B-C, the current on Line B will be [nominally] 1.732 (the square root of 3) times the current of one motor. This is because the currents will be 60? out-of-phase"
thanks
I have a controversial problem and need your helps for clearification.
0.4 HP single phase motor at 220-230V AC, 50Hz,
Rated current (marked on motor nameplate): 2.2A
PF: >0.9
My questions are:
- The rated current (2.2A) is the full load ampere (FLA) of the motor?
- Can NEC? 2008 table 430.248 (NEC? 2002, this is 430.148) be apply for this? and if yes what is FLC of 0.4HP single phase motor at 230V?
- I also heard about lock rotor current (LRC), what is it used for?
As per my understanding, FLA is the rated current marked on the motor nameplate (motor rated current at rated voltage and rated load).
FLC is motor current specified in NEC for safety purposes and for short circuit and ground fault protection device selection. Usually, FLC is bigger than FLA. LRC is for maximum current of motor when it is connected to rated voltage and load and the load is hold unmoved.
Another question. Is the following true?
"When you connect one motor A-B, and another [identical] motor B-C, the current on Line B will be [nominally] 1.732 (the square root of 3) times the current of one motor. This is because the currents will be 60? out-of-phase"
thanks