Circuit Design question - Sub Main to kitchen DB

[Chris Ward]

Hello all.

Im looking into designing an installation which involves supplying a small DB in a kitchen area.

Im trying to see which is the best way of doing this.

There will be a new singl phase main DB going in at the origin, which supplies a ring main, 2 13a heaters & 3 6a lighting circuits, and a socket radial. I also need to supply a kitchen DB with 1 ring main, 16a Heater, and 2 cookers points rated at 32a, and a lighting circuit.

What would you all advise as being the best way of doing this.

My initial idea is a 50a MCB from DB1 WIRED IN 10mm 6242Y? (cable is clipped direct in no insulation at all)

or wire directly from the tails and fuse down through an isolator?

Any input would be greatly accepted.

 

[Silly Sausage]

My initial idea is a 50a MCB from DB1 WIRED IN 10mm 6242Y? (cable is clipped direct in no insulation at all)

Do it that way.

I did the very same at a friends house once for all his outdoor electrics.

 

[Engineer54]

Hello all.

Im looking into designing an installation which involves supplying a small DB in a kitchen area.

Im trying to see which is the best way of doing this.

There will be a new singl phase main DB going in at the origin, which supplies a ring main, 2 13a heaters & 3 6a lighting circuits, and a socket radial. I also need to supply a kitchen DB with 1 ring main, 16a Heater, and 2 cookers points rated at 32a, and a lighting circuit.

What would you all advise as being the best way of doing this.

My initial idea is a 50a MCB from DB1 WIRED IN 10mm 6242Y? (cable is clipped direct in no insulation at all)

or wire directly from the tails and fuse down through an isolator?

Any input would be greatly accepted.

Why would you want, or need a separate CU in the kitchen for???

 

[Chris Ward]

Ideally the DB for kitchen equipment wants to be local to the kitchen as its a small business premises. main DB for shop floor. Small DB in the kitchen. Im starting to wonder myself now wether to bother with it.

 

[Mad Spark]

Im starting to wonder myself now wether to bother with it.

i would stick to your first idea. As you mentioned it would be better for local isolation, and maybe easier as running the cables back to the main db can be a nightmare.

As for the wiring I feel it would be sufficient to use the 50a breaker and the 10mm cable. however the type of cable may be an issue if its only being clipped direct. i would recommend you try sy cable as its going to provide extra protection from mechanical damage.

I hope you find this usefull

 

[Engineer54]

Ideally the DB for kitchen equipment wants to be local to the kitchen as its a small business premises. main DB for shop floor. Small DB in the kitchen. Im starting to wonder myself now wether to bother with it.

Only If distances make it impractical to have a standard single DB. Other than that, can't really see much point!!!

 

[Chris Ward]

i would stick to your first idea. As you mentioned it would be better for local isolation, and maybe easier as running the cables back to the main db can be a nightmare.

As for the wiring I feel it would be sufficient to use the 50a breaker and the 10mm cable. however the type of cable may be an issue if its only being clipped direct. i would recommend you try sy cable as its going to provide extra protection from mechanical damage.

I hope you find this usefull

Cheers Mad Spark, i think you can kind of visualise how I want it to be. The cable is being run in an access space high level, so has no mechanical protection is not a worry as such. It will be surface mounted in trunking where it drops to the DB.

 

[Mad Spark]

cool, good luck.

 

[Chris Ward]

Only If distances make it impractical to have a standard single DB. Other than that, can't really see much point!!!

I see what your saying. The only impractical thing about it would be running al the kitchen circuits through the shop area. The cable runs would be within limits. I wanted to run a kitchen DB so that if they ever needed an extra circuit, within reason, it could be added without having to drag cables right through the shop. It would also allow for expansion in the main DB ifthe case ever arose.

This is why im asking advice from you guys.

 

[SW1970]

Hello Chris, best do a loading design to consider size of incomer, rating of RCDs, MCBs and cable. The 2 x 32A cooker points caught my eye.