breaking capacity of fuse and mcb

[goldie]

Cant seem to find info anywhere for bs3871 m1 plug in wylex type b mcb. Anybody know the braking capacity??
also wylex 5a fuse wire pls
Merry christmas

 

[Des 56]

Put this into google (wiring matters 29 semi enclosed fuses )and click on the IET link that comes up
It's quicker than me writing them out

 

[goldie]

Yo. good man. Ta

 

[telectrix]

BS3871 MCB... M1=1ka. M1.5=1.5ka. M3=3ka. etc...

 

[Guest55]

Tels quick on the draw tonite - must be the mince pies and sherry lol.

 

[goldie]

Cheers tel. M1 is the one i was looking for.

1ka!!??? pretty low. i guess the main incoming service fuse should cover it if pfc is high.

 

[tony mc]

He is!

I had a look at that wireing matters 29 and could not see anything about 3871 mcb;s or is it me !

 

[goldie]

He is!

I had a look at that wireing matters 29 and could not see anything about 3871 mcb;s or is it me !

same here. Only got the 3036 fuses. Maybe its because they are superseeded?

 

[Guest55]

Cheers tel. M1 is the one i was looking for.

1ka!!??? pretty low. i guess the main incoming service fuse should cover it if pfc is high.

no it wont sadly , mcb breaking capacity must match pfc at the CU's terminals.

 

[Des 56]

He is!

I had a look at that wiring matters 29 and could not see anything about 3871 mcb;s or is it me !

me neither,what a silly link :26:


(also wylex 5a fuse wire pls)

 

[goldie]

Al jst pop a new dist board in then biff

 

[tony mc]

I think you will find if the CU meets EN BS 60439 the CU is rated up to 16 kA as a whole irrespective of the individual componants which vary in domestic boards !

 

[Guest55]

I think you will find if the CU meets EN BS 60439 the CU is rated up to 16 kA as a whole irrespective of the individual componants which vary in domestic boards !

that only applies to the internal bus bars , terminals and links within the CU , it does not extend to mcb's which are rated seperately.

 

[goldie]

I think you will find if the CU meets EN BS 60439 the CU is rated up to 16 kA as a whole irrespective of the individual componants which vary in domestic boards !

thats what i always thought. Till biff pi###d on my bonfire.
Got a 100a 1361 type 2 b (33ka)

 

[Guest55]

thats what i always thought. Till biff pi###d on my bonfire.
Got a 100a 1361 type 2 b (33ka)

if all mcb's were automatically rated to 16 ka when fitted in a CU why would they all have 2 , 4 , 6 , 10 Ka stamped on the side ?