Imperial gland - thread size?

[suffolkspark]

Yes, it's a 100mA RCD. The client installed it - an ebay special - himself a while ago, when he realised there was no protection at all on the submain.

Has that cable got overload protection now somewhere or just that rcd between service fuse and the boards it serves

 

[happysteve]

Has that cable got overload protection now somewhere or just that rcd between service fuse and the boards it serves

No, and that's the problem, and that's why I'll be fitting a switch fuse before doing any work. I was there to do an EICR.

Current setup (TN-C-S):

Service head (BS1361, "80A" on label)
-> meter
-> 100A DP isolator
-> Henley block 1 (which also has outgoing tails to local DB1)
-> 16mm T&E (length about 2m)
-> 100mA RCD
-> exposed flex singles (length about 20cm, approx 16mm CSA)
-> another Henley block
-> MICC (length about 20-30m)
-> DB2 (adjacent/physically linked metal fuse boxes with BS3036 fuses)
-> socket circuits

Proposed setup:

Service head
-> meter
-> 100A DP isolator
-> Henley block (which also has outgoing tails to local DB1)
-> 25mm or 16mm tails
-> switch-fuse
-> MICC
-> new DB2 (with 30mA RCD protection for all circuits)

 

[happysteve]

For anyone interested, here's the before and after photos of both ends of this old pyro submain.

Was a shame to take out the old metal BS3036 boards (and the dual RCD board wasn't my choice, it was supplied by the client - normally I fit all-RCBO boards). The other end, however, was a big improvement.

Thanks for all the info and suggestions about the old imperial thread - a 1" to 25mm adapter worked a treat for the end that was missing a locking ring.

Cheers all!

DB2 before:

DB2 after:

Source of pyro distribution circuit, before:

Re-terminated using switch-fuse:

 

[MJPD29]

Looks a good job

 

[davesparks]

That's a creative way to misuse a thread adaptor.

 

[Mike Johnson]

Necessity being the mother of invention.