# How to calculate the amperage of an installation?

**Sommaire de notre article**

- How to calculate the amperage of an installation?
- How to size a head circuit breaker?
- How to choose the amperage of a circuit breaker?
- How to size your circuit breaker?
- How to size circuit breakers?
- How do you calculate MCA and mop?
- What happens if MOP is less than MCA?
- What is the difference between MCA and MoCp?
- How to calculate the value of MCA?

### How to calculate the amperage of an installation?

The intensity in **Ampere** is equal to the voltage in volts divided by the resistance in ohms. The power in Watt is equal to the tension in Volt multiplied by the intensity in **Ampere**.

### How to size a head circuit breaker?

**How** calculate the load capacity of my **circuit breaker**?

- Find it
**circuit breaker**that matches your devices, - Multiply the amperage by 0.8 to get 80%,
- Calculate the amperage of each object you want to plug into the circuit.

### How to choose the amperage of a circuit breaker?

L’**circuit breaker current** will then depend on the cumulative power of the equipment that will make up the electrical installation. For example, for a power of 3500 W on an exclusively electric heating circuit, the **circuit breaker** which will be installed in the electrical panel will have a rating of 16 Amps.

### How to size your circuit breaker?

For a circuit of socket outlets: a **circuit breaker** 16 A max for 8 sockets, with section of 1.5 mm2; or one **circuit breaker** 20 A max for 12 sockets, with section of 2.5 mm2. For a circuit of sockets dedicated to the kitchen: a **circuit breaker** 20 A max for 6 sockets, with section of 2.5 mm2.

### How to size circuit breakers?

The intensity of **circuit breaker** will then depend on the cumulative power of the equipment that will make up the electrical installation. For example, for a power of 3500 W on an exclusively electric heating circuit, the **circuit breaker** which will be installed in the electrical panel will have a rating of 16 Amps.

### How do you calculate MCA and mop?

How We Calculate **MCA **and **M.O.P. **Minimum Current Ampacity (**MCA**). **MCA **= 1.25x [Motor Rated Current + Heater Current]. The Motor Rated Current is sometimes referred to as the FLA (full… Maximum Overcurrent Protection (**M.O.P.**). First, a basic calculation is made, and then a number of filters or …

### What happens if MOP is less than MCA?

Filter 2: If the **M.O.P. **is less than the **MCA**tea **M.O.P. **is made equal to the **MCA **and then rounded up to the nearest standard fuse size, typically a multiple of 5. In other words, the **M.O.P. **shall not be less than the **MCA**. Final Filter 3: If the **M.O.P. **is less than 15, it shall be rounded up to 15 amps.

### What is the difference between MCA and MoCp?

but 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. Thus, MOCP is 25 A for this 3-phase load (Condition 2).

### How to calculate the value of MCA?

Let’s see one example of how to calculate the value of MCA. Given Data: Supply Voltage = 3-phase 480 V, Heater load = 12 KW, Motor FLA = 5 A Thus, the value of MCA is 20.7 A. As discussed above that the value of MOCP and MCA are provided on the nameplate of equipment .