Load Calculation for Floor Box

The loading on the box will be limited by the wiring and its protective devices that form the fixed installation in the building.

Ask a local electrician: hire a local electrician: consult local code book:

Google "electrical load calculations"

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Apart from connected load factors like diversity(simultaneous load)too should be considered to arrive at running load.

you have to consider 2 Nos. of single sockets in each compartment for load calculations if the load is continuous. if your load is intermident you can consider half of the value of above said.

Should we consider load characteristics like continuous,intermittent,periodical, fluctuating too?.

yes we have to consider continuous & intermident load.

I remember BS7671 or "Onsite guide" describing cable sizing for a fluctuating load(electric lift or elevator).

thanks shajahan

It depends what code your using.

For ex., in US code the load is 3 x 180w =540w.

BS7671 says you consider maximum possible connected load, which would be limited by wire and breaker size.

If each of these floor boxes is on a 15A/1p breaker,

maximum load could be (for ex.) 15A x 230v x .8= 2760w on a 2.5mm^2 wiring system.

And then adjust for diversity, voltage drop, temperature, conduit fill.....etc.

wheather a 2 wire of 2.5sq.mm will manage to flow a 15A current?

Thanks 1capybara

"wheather a 2 wire of 2.5sq.mm will manage to flow a 15A current?"

i dont have BS7671 in front of me, but yes, it can.

using BS7671 or IS equivalent is an important skill you must practice please,

you will find it constantly helpful in your career