Ask The Trades - Print Page

Ask The Trades
https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> NSB40 fuse to 45Ampere https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1233420919 Message started by elliotbright on Jan 31^st, 2009, 4:55pm

Title: NSB40 fuse to 45Ampere
Post by elliotbright on Jan 31^st, 2009, 4:55pm

can an existing NSB40 fuse and existing cable be used to install a range cooker with a 45Ampere minimum capacity requirement?

Title: Re: NSB40 fuse to 45Ampere
Post by Lectrician on Jan 31^st, 2009, 7:11pm

Where have you read the 45amp requirement?

Usually, by the time you apply some diversity factors to the cooker, you will find it will sit easily on a 40amp device, and even on a smaller one.

Title: Re: NSB40 fuse to 45Ampere
Post by Y3 on Jan 31^st, 2009, 7:12pm

Applying diversity as follows...

the first 10 amps + 30% of the remainder, so 10 + 10.5 = 20.5 amps. If the cooker panel has a 13a socket outlet incorporated in it then 5 amps would need to be added giving 25.5 amps.

This is also dependent upon how long the run of cable is, how its fixed or housed or where it runs through. What size is the cable at present?

If diversity is followed and everything above is ok for the cable then a 40a fuse will be adequate.

Title: Re: NSB40 fuse to 45Ampere
Post by Zambezi on Feb 1^st, 2009, 5:55pm

Unless the cooker is going to be used in a "commercial" environment where it is likely to be used on full power most of the time.

Title: Re: NSB40 fuse to 45Ampere
Post by LSpark on Feb 1^st, 2009, 8:31pm

Y3 summerised diversity nicely. But yes, different allowances (or none as the case may be), apply to commercial situations.