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Can someone validate the electrical layout in this diagram?

a) Would like to know whether the double pole MCB, RCB (ELCB) is required for residential property?

b) should the main ON/OFF switch per floor be before going to the distribution board in the meter board box?

Dear sir
ELCB is very important for your electrical circuit in your home ,inorder to increase safety of appliances and also to safe guard human beings from electrocution to some extent ,ELCB plays vital role in ensuring safety to you and your family

thanks praveenpowers.

is the double pole MCB required? if so, what is the purpose of it?

Double pole MCB is not required for your resedential need sir

is a MCCB (Molded case circuit breakers) required for residential house?