Load Calculation MCB

How to calculate the size of wire and MCB

To calculate the scale of associate degree correct MCB is extremely crucial as per the planning purpose of read. For an easy calculation, we must always recognize the particular load on the given circuit. for instance, if we’ve got five Nos twenty-two Watt LED on a circuit, the full load on the circuit are a hundred and ten Watt. these days Lights square measure continuous load i.e. the variety issue is one.

Actual load on a circuit are = a hundred and ten X diversity issue = a hundred and ten W

Current flowing within the circuit = 110/ (Voltage X PF) = zero.6 Amps

We have MCBs of rating 6Amp, 10 Amp, 16 Amp, 32 Amp.

Since the present rating is zero.6 Amp we’ll select a half dozen Amp MCB in this case. it’s easy, isn’t it? thus next time you are trying to calculate the scale of MCBs for your home, calculate MCBs for one by one circuit. it’ll be terribly straightforward to try and do in this manner.

To decide the quantity and kinds of MCB/ ELCBs in your office/ home, you need to put in writing the quantity of electrical instrumentation utilized in your premises. Then begin dividing them into totally different electrical branches (on the premise of your wire size calculations and cost-effectiveness).

Example 01

For example, suppose one building has 07 rooms with following equipment in each room.

How do I choose my current MCB rating

For MCB it is fixed while in MCCB the rated current is an adjustable range instead of a fixed value. Standard rating of MCB is 1A, 2A, 3A, 4A, 6A, 10A, 13A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 100A for MCB