![]() ![]() The value of MCA is provided on the nameplate of the any equipment or unit by the manufacturer to ensure safe operation. Here, MOCP < 15 A hence, the value of MOCP is rounded up to 15 A which is the minimum current rating of the circuit breaker (Condition 3). Given Data: Supply Voltage = 3-phase 480 V, Heater load = 5 KW, Motor FLA = 0 Example 3: Calculate the MOCP value for 3 – phase, 480 V, 5 KW heater load. Thus, MOCP is 25 A for this 1-phase heater load (Condition 2). Here, MOCP < MCA hence, the value of MOCP is taken equal to the value of MCA and it is rounded up to nearest circuit breaker rating. ![]() Given Data: Supply Voltage = 1-phase 277 V, Heater load = 5 KW, Motor FLA = 0 Example 2: Calculate the MOCP value for 1 – phase, 277 V, 5 KW heater load. ( Note that in USA 277 V is 1 – phase voltage and 480 V is 3 – phase voltage and for India 230 V is 1-phase and 415 V is 3-phase voltage). Thus, MOCP is 25 A for this 3-phase load (Condition 2). thus,īut 20 A is less than the value of MCA hence, the MOCP is taken equal to the value of MCA and it is rounded up to the nearest circuit breaker rating. Here, the value of MOCP is not an even multiple of 5 hence it is rounded down to the nearest circuit breaker size i.e., 20 A. Given Data: Supply Voltage = 3-phase 480 V, Heater load = 10 KW, Motor FLA = 4.5 A Example 1 : Calculate the MOCP value for 3 – phase, 480 V, 10 KW heater load with motor FLA 4.5 A. Let’s see examples of how to select MOCP value based on the above three conditions. This 15 A is the minimum current size or rating of the fuse or circuit breaker permitted by code. If MOCP Hence the value MOCP is not less than the value of MCA. If MOCP Multiple of 5 i.e., if the calculated value of MOCP is not an even multiple of 5 then the value of MOCP is rounded down to the nearest standard fuse or circuit breaker size.So, the proper sizing is necessary for protective devices.Īfter calculating the value of MOCP, we must select the value of MOCP based on three conditions which are given below. If the protective devices are oversized then it may be unable to operate under fault condition and hence, the wire or equipment may get damaged due to overheating. MOCP is the maximum permissible rating or size of the circuit breaker that will properly disconnect the circuit or equipment under any anticipated fault condition. MOCP stands for Maximum Over-Current Protection and is defined as the maximum allowable current rating for the over-current protection devices (such as a fuse or circuit breaker) associated with a piece of electrical equipment (e.g. Example: Calculate the MOCP value for 3 – phase, 480 V, 12 KW heater load with motor FLA 5 A.Example 3: Calculate the MOCP value for 3 – phase, 480 V, 5 KW heater load.Example 2: Calculate the MOCP value for 1 – phase, 277 V, 5 KW heater load.Example 1 : Calculate the MOCP value for 3 – phase, 480 V, 10 KW heater load with motor FLA 4.5 A.What Does MOCP Mean in Electrical Terms?. ![]()
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