cable size for 6kw x 2 fryer ?

[a1pacino]

Hi all, can anyone tell me what cable size I should use for 2 x 6kw fryer's which has a run of 20 meters, it's been a while since I had to work these out and have got a little rusty so I used an online cable size calculator which gives me 4mm- is this correct? Any help would greatly appreciated!

 

[Lee321]

is the plan to run both from 1 supply?

 

[a1pacino]

no it is 2 separate supplies

 

[m4tty]

6000w/230v = 26.09a would be pushing it on 2.5mm so prob best to use 4mm . WhAt CPD are you using

 

[green-hornet]

Supply voltage = 230 Volts

Ib - design current = 26.1 Amps

Protective device type = MCB typeB

In - protective device rating = 32 Amps

Length of run of cable = 20 meters

Power factor = 1

Cable Type : Twin & Earth

Installation Method : Single-core or Multi-core cables Fixed on (clipped direct), or spaced < 0.3 x cable diameter from a wooden or masonary wall

method C

Ambient temp = 30

 

[a1pacino]

I am using a 32A C breaker it is ran is 3 core SWA 4mm, the reason I ask is that one of the fryer's is working ok but the other burnt at the neutral connection and it worried me that I should have used a bigger cable instead- any ideas why it burnt at one of the neutrals?

 

[Lee321]

why type c? just because you have one? ray

 

[green-hornet]

Type c would not disconnect in the required time if 0.35 Ze is taken but type B would.

I would check your Ze just to make sure the Zs is within the limits for a type C.

 

[m4tty]

Not loose connection ? Have you tested the fryers at all?

 

[a1pacino]

as it is in a commercial building, these fryer's are being used in a small kitchen/canteen area

 

[Lee321]

Type c would not disconnect in the required time if 0.35 Ze is taken but type B would.I would check your Ze just to make sure the Zs is within the limits for a type C.

 

[Lee321]

as it is in a commercial building, these fryer's are being used in a small kitchen/canteen area

that has no design bearing

 

[a1pacino]

Not loose connection ? Have you tested the fryers at all?

The fryers worked for most of the day but burnt a couple of hours ago The connections were tight so am unsure why this has happened I got worried I had put a cable in that was too small

 

[green-hornet]

Supply voltage = 230 Volts

Ib - design current = 26.1 Amps

Protective device type = MCB typeC

In - protective device rating = 32 Amps

Length of run of cable = 20 meters

Power factor = 1

Cable Type : Thermosetting 90

 

[a1pacino]

that has no design bearing

I am not used to working in these types of premises, I used C as that's what they used for every thing else.

 

[Lee321]

the screw may have been tight but was the cable clamped tight ?

 

[a1pacino]

Supply voltage = 230 VoltsIb - design current = 26.1 Amps

Protective device type = MCB typeC

In - protective device rating = 32 Amps

Length of run of cable = 20 meters

Power factor = 1

Cable Type : Thermosetting 90

 

[Lee321]

#16

 

[a1pacino]

the screw may have been tight but was the cable clamped tight ?

I am pretty sure it was but if it is not the cable size it must have been connection?

 

[Lee321]

a dodgy switch could have transferred the heat to the connection

is the switch rated high enough?