3 phase pizza oven

[jagermini]

Hi, just a quick query about a 3 phase pizza oven folks? The oven is 9 kVA, the run from the board to the isolator is 7 meters swa run in plastic trunking, so I'm calculating;

9 kVA = 9,000 W at near 1 PF (it's an oven so far as I remember it is practically PF 1)

9000 / (root3 X 400) = 12.99

Design current of 12.99 A so therefore a MCB of 16 A

I've not got tables to hand, but I think 4 sq cable should suffice for this.

That sound about right to any of you?

 

[Engineer54]

You could use a 2.5mm or even a 1.5mm SWA cable, both would comfortably handel a load of 13A!!!

 

[jagermini]

Cheers Engineer54, just don't have the tables with me. I'm used to oil & gas where the calculations are done by the engineers, and if in doubt, up the size. Thanks!

 

[Farmelectrics]

agree 2.5 cable

 

[Spoon]

As post 2...

 

[jagermini]

Thanks for the input folks, pints owed all round.

 

[jagermini]

Okay there's been a change, I was incorrect about equipment ratings, was just given specs for oven and it's actually 13.2 kW, not 9kW. Therefore;

13,200 / (root3 X 400) = 19.05

Design current of 19 A so therefore a MCB of 20 A.

And then now the 4sq cable would be correct in this circumstance?

Thanks again for the help folks.

 

[the pict]

I dont doubt the cable calcs but,can I ask why armour I use HOR7N for most commercial kitchen work, and I assume the trunk is already there or are you mounting the trunk also,
[h=3]Flexible Cords[/h]Table Applies to: Flexible cords such as 318-Y, 309-Y, H07RN-F, SY, CY, YY
Voltage:400V
Load:13kW / 23.45A
Length:7m
Method of Installation:Enclosed in conduit on a wall or in trunking
Cable Size:4mm²

 

[jagermini]

Hey Pict, ah I was just saying swa to make the thread easier, and because that's what's used already in the property on other equipment. I will ask the supplier see if they have Silflex and plastic conduit though. I'm in a rural part of Ireland here, sometimes you've just gotta take what you can get.

 

[the pict]

I know what you mean jager, I am off shore, and its not always the way that you have whats the best but the best of what you have
P

 

[ian.settle1]

Hi, just a quick query about a 3 phase pizza oven folks? The oven is 9 kVA, the run from the board to the isolator is 7 meters swa run in plastic trunking, so I'm calculating;

9 kVA = 9,000 W at near 1 PF (it's an oven so far as I remember it is practically PF 1)

9000 / (root3 X 400) = 12.99

Design current of 12.99 A so therefore a MCB of 16 A

I've not got tables to hand, but I think 4 sq cable should suffice for this.

That sound about right to any of you?

Why run the SWA in trunking you might as well use singles if your running it in trunking

 

[jagermini]

That's it Pict, gotta make do.
Ian it's just that I can't run trunking right up to the board, just how it's set up down there. And I don't want to leave swa out all the way, as it's a kitchen, and it looks ****e. So I think silflex or something run through plastic conduit or trunking just to keep it a bit tidier looking, easier to clean, etc.

 

[Jm1980]

Not got my regs to hand but even for 20A then you probably wont have to go to 4mm swa, 2.5mm would be good enough although 4mm would be more belt and braces i agree........not sure what they installation method of swa in trunking is though! :smilewinkgrin:

edited as i read you probably arent going the swa route now. HO7RNF 2.5mm might be good for 20A though and probably easier to get hold of than 4mm.