confused with which cable size for hob


Postby droney » Sun Aug 05, 2007 4:18 pm

Hi, Im having fitted a new hob to my kitchen and I was wanting to run the wiring in advance. I thought the hob would need 6mm cable but the instructions show a diagram with the following -

220-240 v - H05V2V2-F 2.5MM

The hob is 6.4 kw

Would 2.5mm cable be able to work safely with this?

All help appreciated.
droney
Posts: 6
Joined: Sun Aug 05, 2007 4:16 pm

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Postby BLAKEY1963 » Mon Aug 06, 2007 10:29 am

[quote="droney"]Hi, Im having fitted a new hob to my kitchen and I was wanting to run the wiring in advance. I thought the hob would need 6mm cable but the instructions show a diagram with the following -

220-240 v - H05V2V2-F 2.5MM

The hob is 6.4 kw

Would 2.5mm cable be able to work safely with this?

All help appreciated.[/quote]

DRONEY
HAVE 2 MENTION FIRST THAT WORK IN A KITCHEN IS NOTIFIABLE , AND MUST B DONE BY A PART P REGISTERED ELECTRICIAN.
HOWEVER I CAN GIVE U SOME INFO ABOUT CABLE RATINGS.
6400 WATTS DIVIDE BY 230 VOLTS GIVE U 27 . 8 AMPS.
FROM TABLE 4D2A, P 222 OF BS7671 ( 16 ED REGS )
A 2.5 MM2 IS RATED AT 27 AMPS CLIPPED DIRECT TO SURFACE.
WITH INSTALLATION METHODS CONSIDERED IT IS LIKELY TO
BE RATED AT 18 . 5 AMP ( WORST CASE SCENARIO ).
SO I THINK 2 . 5 MM2 SHOULD NOT B USED.
4 MM2 UNDER SAME CONDITIONS OF INSTALLATION WOULD B RATED AT 25 AMPS.
SO IDEALLY , FOR SAFTEY WE WOULD ARRIVE AT 6 MM2 WITH A RATING
OF 32 AMP AFTER APPLYING DERATING INSTALLATION CALCULATIONS.

BLAKEY1963
BLAKEY1963
Posts: 654
Joined: Wed Jun 13, 2007 10:57 pm


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