old circuit breakers and Icn

[tawraste]

hi all,
just working through my inspect and test books and comparing my own house to what's in the book. i've had a look at my cu and cannot for the life of me determine the rated short circuit breaking capacity of my main switch which is a wylex wsem 63/2 63A 100mA to BS4293. everything else in the box has its m number as expected, but not the wylex main switch.
this is an exercise in learning only! but it has occured to me that in the future i'm gonna see a lot of old switches with no rating on them. so, i was wondering if it's simply down to experience in the field or if there's a comparison chart or web page or something that helps folks to determine these values ?
many thanks,
tawraste

 

[malcolmsanford]

hi all,
just working through my inspect and test books and comparing my own house to what's in the book. i've had a look at my cu and cannot for the life of me determine the rated short circuit breaking capacity of my main switch which is a wylex wsem 63/2 63A 100mA to BS4293. everything else in the box has its m number as expected, but not the wylex main switch.
this is an exercise in learning only! but it has occured to me that in the future i'm gonna see a lot of old switches with no rating on them. so, i was wondering if it's simply down to experience in the field or if there's a comparison chart or web page or something that helps folks to determine these values ?
many thanks,
tawraste

That is an RCD and as such would not Icn rating as it will trip at 100mA not Ka

 

[tawraste]

lol, it's so obvious! thanks again malcolm, thats twice you've put me straight this weekend!

 

[Electro-tech]

Hears one I made earlier ..Bit late !

 

[Deleted member 26818]

Consumer units that meet BS EN 60439 are rated at 16kA as a whole, irrespective of the breaking capacity of individual componants, which vary and are normally for domestic use: 6kA, 10kA or now 15kA.

 

[Dcf]

bet its better build quality than the ***** they make now Eh?