Overload Help

[telectrix]

no, not my brain overloaded, but it's getting there. called out to a pub, regular customer. problem is his pub kitchen load. situation is:;

Main DB supplies most of the pub circuits - individual MCBs. 4 63A MCBs each feed sub-DBs. Main Board is full, no spare ways.

Problem is the main kitchen DB, a 10 way square D. is pulling, when the kitchen is up and running, 65A + through the 63A Type C MCB in the main DB. This MCB is tripping, obviously , depending on stats. switching and excessive load, the current is just too much.

The feed to the kitchen DB is in 16mm, and at the 60+amps, it's temperature is 39deg. it's surface clipped,about 10 metres.so a short answer would be to push the MCB to 80A, but this is getting close to overloading the 16mm, and there is not an 80A MCB made ( it's a memshield board.

Short of a major wiring job, I can't see an easy solution.

I'm going down today to see if there's any way of diverting some of the kitchen load to another DB that is'nt so heavily loaded, and look at the option of splitting the tails at the main DB and feeding the problem kitchen via a switch fuse. just concerned if I can protect the 16mm feed at 80A without overloading it.

 

[telectrix]

at the end of the day, he's going to owe me and the missus a bloody good t-bone

 

[i=p/u]

just spread the load, but tell him 'nay more sir

 

[nickblake]

at the end of the day, he's going to owe me and the missus a bloody good t-bone

T Bone is that all at least a 32 oz er

 

[pennywise]

T Bone is that all at least a 32 oz er

It'll be a very rare T-Bone by the sounds of things

 

[telectrix]

T Bone is that all at least a 32 oz er

that's the one with all the chips and all. back to the job. plan is to divert one high load appliance fromoverloaded board to a 45A D/P isolator ( not in use but wired to supply from other board) copex and 6mm singles, only about 3m run, check olads again and if necessary divert another to second disused isolator. this should shift between 30 and 50A to the under used board. then it's up to the landlord, the brewery and manweb to sort out the supply side. if they go for 3 phase, it's a bloody long trench from wrexham.

 

[i=p/u]

might be better efficent appliances out there, but i know they costly too, my brothers friend paid 30k for ice cream counter

 

[pennywise]

would love to see pics of the main head it must have a nice pool of bitumen around it by now

 

[telectrix]

DNO have already replaced the neutral conn. caught fire a few weeks ago. it's not a normal head. 2 supply tails about 70mm into separate boxes. looking at the green deposit on what i can see of the tail ends. no way am i even going to try and get the cover off. not my problem.