16mm SWA on 100amp 3036?

[Dave 85]

Hi lads
So....was working in a top floor flat the other day built in '98 and I noticed the incomer was a 16mm SWA. I went down to the meter cupboard on the groundfloor and found it protected by a 100 amp switchfuse.
Now in the book if I remember rightly for a 70 degree 16mm SWA ref meth C the max is around 87 whereas for a 90 degree cable its 101 or something.
Either way I thought they were cutting it a bit fine.
If it is an error..its a pretty F'ing major error for a company wiring new build blocks of flats.

My questions are
Have the current capacity of cables in BS7671 been modified since '98?
How am I supposed to know if its a 70 or a 90?
If it is inadequate...would you demand the fuse downrated/cable uprated before carrying out work?

Already done the job so just an afterthought really...just wondered what you guys thought

 

[jaydee81]

would down grade fuse to 80 amp max you sure its a 3036 as thats a rewireable fuse

 

[Guest55]

Hi lads
So....was working in a top floor flat the other day built in '98 and I noticed the incomer was a 16mm SWA. I went down to the meter cupboard on the groundfloor and found it protected by a 100 amp switchfuse.
Now in the book if I remember rightly for a 70 degree 16mm SWA ref meth C the max is around 87 whereas for a 90 degree cable its 101 or something.
Either way I thought they were cutting it a bit fine.
If it is an error..its a pretty F'ing major error for a company wiring new build blocks of flats.

My questions are
Have the current capacity of cables in BS7671 been modified since '98? Yes
How am I supposed to know if its a 70 or a 90? only xlpe cable is rated for 90 deg , it will be stamped on the sheath.
If it is inadequate...would you demand the fuse downrated/cable uprated before carrying out work? It should all work fine on a 80amp fuse.

Already done the job so just an afterthought really...just wondered what you guys thought

hi , long time no see pal

 

[Dave 85]

would down grade fuse to 80 amp max you sure its a 3036 as thats a rewireable fuse

Yeah I meant 1361 sorry

 

[Dave 85]

hi , long time no see pal

Its a big 3 story flat, the kitchen alone has 9 circuits in it. Seems a bit of a **** poor design to run an 80 amp cable to the flat and then enough bleeding circuits into the kitchen to carry 200amps.