Discuss Puzzled by kitchen toaster - learner's question about flexible cables in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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S

Sats

Hello all

I was wondering if anyone could help me understand why our toaster came with a 0.75 sq mm flexible cable with 13A BS1362 fuse on the plug.

In class we've learnt that the rating of a protective device has to be lower than the current carrying capacity of the cable it protects.

But when I looked at Table 4F3 in the Wiring Regs it seems the current carrying capacity for this sort of cable is 3A, well less than 13A.

The cable is marked:
KENIC * <VDE> KEMA-KUR <8VE> CEBEC +S+S+S IEMMEQU S D N F1 NF-USE 1327 KELC-75 N15075 H03VVF 3G 0.75mm2 300/300V RS

(Bold bits in little circles)

Any help would be greatly appreciated.

Many thanks

Sats
 
i reckon the capacity of the 0.75 is about 6amp

i think 3amp and 13amp fuses are the standard on new appliances these days(light and heavy loads)

don't know too much on appliance cords but it seems to be sized according to the load(about 1kw)and not the ocpd(fuse) presumably because overload isn't an issue
 
Precisely, fixed load, 500mm of flex, no problem.
 
Its the same with vacume cleaners you often get a .75mm cable and a 13 amp fuse they have to use large fuses due to the surge when they are switched on other wise they would constantly blow fuses normally toaster are about 800 watts so after the surge has settled the toaster will run on its nominal current ,davelect you are right 3 and 13 are standard although we also use 2 and 5 amp when recommended by manufacturers
 
Last edited by a moderator:
Thank you davelerave, that's great information. I would never have guessed that appliance cords weren't sized according to the current carrying capacity, but now I know, thanks to you. Cheers!
 
Thank you too nickblake and IQ electrical for those great follow-ups with the additional information!
 
Also if the equipment has internal overload protection then the cable has to be sized for short circuit protection only and therefore the cable can be sized for the design current of the circuit (Ib) as opposed to the setting of the protective device (In) see reg 5.2
 

Reply to Puzzled by kitchen toaster - learner's question about flexible cables in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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