Answer Posted / ratheesh

Types of wires:

7/20 , 3/20 & 1/18 wires types are there.

Nominal C/s area in mm:
This is for three phase connection

Main cabinet to DB box 7/20 = 7/.914mm
DB box to Geyser 7/20 = 7/.914mm
DB box to AC point 7/20 = 7/.914mm
Main cabinet to EB box earth wire 3/20 = 3/.914mm
Switch board to individual points 1/18 = 1/1.12mm

This is for single phase connection

Main cabinet to DB box 7/20 = 4mm
DB box to Geyser 7/20 = 7/.914mm
DB box to AC point 7/20 = 7/.914mm
Main cabinet to EB box earth wire 1/18 = 1/1.12mm
Switch board to individual points 1/18 = 1/1.12mm

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