All vertical dropper busbar are connected from the main busbar.

The vertical dropper busbars are fixed in a chamber located at the rear part of the front compartment.

It is fully covered by transparent covers to provide easy visual inspection and protection against accidental touch.

Plug-in or in another term demountable functional unit consist of a set of main connection plug and a feeder unit mounted on base panel.

The plugs are connected by either copper busbar of cables to the feeder unit. Plug in /demountable functional unit can be plugged into the vertical dropper busbar with ease.

The advandatage of using the plug-in/demountable functional unit is that it enables disconnection of the unit without interruption of the supply.

It too enables modification of the switchboard feeders without the requirement of shutting down the incoming supply.