Overload or what ?

[BOSUN]

I got a call from a lad who runs a snack shop asking why his fuse kept 32 amp fuse kept tripping . I went to the shop to have a look he has a total of 20000 watts (100 amps )on at one time with fryers, hot plates ,grills etc ! All single phase . Having little experience myself as a spark I would say he needs 3 phase ? Can any lads give me advice

 

[Richard Burns]

You can probably manage to run a potential total 100A load quite readily on a 100A supply fuse.
The circuits may need to be appropriately split up to even out the load on any one breaker.
If the maximum total demand is in excess of 100A then a three phase supply would be indicated.
However cost wise it may be cheaper to rationalise the loading and ensure that the maximum demand is not over 100A.

 

[BOSUN]

You can probably manage to run a potential total 100A load quite readily on a 100A supply fuse.
The circuits may need to be appropraitely split up to even out the load on any one breaker.
If the maximum total demand is in excess of 100A then a three phase supply would be indicated.
However cost wise it may be cheaper to rationalise the loading and ensure that the maximum demand is not over 100A.

I would need to check the main fuse size as I replaced a main fuse few weeks ago in a house which had blown caused by short circuit, when I opened the cartridge up I found it was a 63 amp fuse
Thanks for the reply Richard

 

[Silly Sausage]

Suggest he removes deep fried pizzas and Mars bars from his menu.


20kW is only 87A anyway, do as Richard says and spread the load.

 

[BOSUN]

Suggest he removes deep fried pizzas and Mars bars from his menu.


20kW is only 87A anyway, do as Richard says and spread the load.

 

[BOSUN]

Cheers pal

 

[Octopus]

I got a call from a lad who runs a snack shop asking why his fuse kept 32 amp fuse kept tripping . I went to the shop to have a look he has a total of 20000 watts (100 amps )on at one time with fryers, hot plates ,grills etc ! All single phase . Having little experience myself as a spark I would say he needs 3 phase ? Can any lads give me advice

Unless you establish what is connected to said 32A MCB you won't make any progress. The 100A total may not be relevant but useful to know.

 

[Wilko]

Hi Bosun, if your friend has been frying this circuit for a while (gradually adding load till it pops, resetting, go again etc) then I suspect the MCB may also be cooked. So, along with the works to distribute load across other circuits I would replace this MCB.

 

[BOSUN]

Hi Bosun, if your friend has been frying this circuit for a while (gradually adding load till it pops, resetting, go again etc) then I suspect the MCB may also be cooked. So, along with the works to distribute load across other circuits I would replace this MCB.

Thanks wilko for the advice

 

[Andy78]

And possibly any thermally damaged cables.