Using a MCB as a main switch

[mickfred]

My boss has just took over a new site and I went to look the layout. Some boards are damaged some cables need replacing and am sure some other stuff. The site has a old busbar with isolators feed various boards and of her isolators. It also has a board connected directly on to the busbar . The main switch for this board is rated 125a the tails are 35mm ,but the fuse in the maintenance isolators are 250amp DD fuses. So the board and the tails have no protection. My question is (and I know it's late so be gentle) could I swap the main switch for a MCB , or will I have to relocate and feed it off a isolator with correct fuses (the board is a Hager tp and n Invicta3 ) . Now to go home and bed

 

[mickfred]

Cheers dark wood for you reply I think yours is the way to go in the near future . At the moment I will fit the MCB to stop any problems thatcould happen in the meantime and gives me more time (have too much on at the moment ,doingdl sixty hours and more stuff being push on at the last minute ) fully test the current system . Ta for anyone who has replied as it can be hard to bounce ideals around when no one you work with has a clue what you talking about .

 

[mickfred]

Cheers dark wood for you reply I think yours is the way to go in the near future . At the moment I will fit the MCB to stop any problems thatcould happen in the meantime and gives me more time (have too much on at the moment ,doingdl sixty hours and more stuff being push on at the last minute ) fully test the current system . Ta for anyone who has replied as it can be hard to bounce ideals around when no one you work with has a clue what you talking about .