What is MOCP in HVAC?
The maximum overcurrent protection (MOCP) is the maximum circuit breaker size that may be used to protect the WIRE and the equipment under anticipated fault conditions.
What is MOCP fuse rating?
Chiller motor electrical design From the nameplate information, the Minimum Circuit Amps (MCA, defined as wire sizing Amps) is 414 and the maximum overcurrent protection (MOCP) is a 500 Amp fuse.
What is the difference between MCA and FLA?
MCA (Minimum Current Ampacity) is used for conductor sizing to ensure that the wiring does not overheat under normal operating conditions. FLA (Full Load Amps) is the amount of continuous current that a running motor will consume and what we use in our load calculations.
What type of fuses should be used with air conditioning systems?
Generally a two-pole, 30 amp fuse is used for central air conditioners, but it is always recommended to check first. Remember to turn off the thermostat before beginning the fuse replacement process.
What size overcurrent protection do I need?
Step 1 – Size the overcurrent device in accordance with 210.20(A) and 215.3. These two NEC rules require the overcurrent device (breaker or fuse) be sized no less than 100% of the noncontinuous load, plus 125% of the continuous load.
What is the difference between Fla and RLA?
FLA: Full-Load Amps: Amount of amperage drawn when motor is working at rated horsepower. RLA: Running-Load-Amps: Same as FLA. LRA: Lock-Rotor-Amps: A motor draws a surge of amperage when it starts to get the rotor rotating and to achieve the rated horsepower.
How does MCA calculate Fla?
MCA = 1.25 x [Motor Rated Current + Heater Current] The “Motor Rated Current” is sometimes referred to as the FLA (full load amps) of the unit.
How do you convert FLA to MCA?
MCA = 1.25 x [Motor Rated Current + Heater Current] The “Motor Rated Current” is sometimes referred to as the FLA (full load amps) of the unit. This can be a source of confusion because this rated current is not the same as the motor FLA shown on the nameplate of the motor itself.
What is WSA electrical?
MCA (minimum circuit ampacity) = WSA (wire sizing amps) = your wire ampacity must be this big or larger. You may need a larger size (for voltage drop or energy savings or whatever) but you cannot use a smaller size.
Why does the fuse keep blowing on my AC?
The most logical cause of your air conditioner tripping a breaker or blowing a fuse when it comes on stems from a problem with the electrical connection, the power supply, or the circuit that powers the system. Breakers and fuses are designed to trip or blow when too much voltage is sent through the line.