Submain discrimination

[Glospark]

Is it most prefered when installing a sub main in a commercial premises to come of the main DB with say a 63 amp MCB or split tails and use a 63 amp switch fuse.

Can discrimination be a problem if using an MCB?

 

[Evans Electric]

More info required M8, is there a busbar chamber there or a panelboard or just the one main switch.?

 

[batty]

for submains i always think cartridge fuses are better than mcb's but thats just a personal thought.

 

[Evans Electric]

Cartridge fuses are great IMHO . A lot of people these days only seem to think in terms of MCBs / MCCBs

 

[steptoe]

I agree Deke,

but Im currently at great lengths trying to explain to a customer why he should use switch fuses rather than 3p MCBs for his submains,

he just seems to think the MCBs are cheaper so use them!!!!!!! headbang

 

[Glospark]

Thanks fellas.

The setup at the minute is 1 main 3ph DB fed from the tails with 100 amp service fuses.