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It is an electrical lighting distribution board that is used in India. It is similar to the lighting distribution panel board used in North American homes.
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A sub main is a distribution board fed from the main distribution board panel normally protected via a CPD.
The switch turns the supply on and off whilst the distribution board takes the incoming supply and separates it into the various loads - lighting, cooker, shower, sockets, etc. In modern domestic electricity supplies the distribution board usually incorporate a mains switch but in the earlier days of electricitythe switchwould be mounted separately from the 'fuse box' because the materials used were quite bulky in comparison to modern alloys and plastics.
distribution board
There aren't any airlines that allow candle lighting on board.
power distribution board
It is a device that carried various sizes of fuse to supply power to different areas of the building respectively.
*The control board
main db using mcb sub main db using mccb that is deference
give marks distribution of subject physics
Main distribution board