Jump to content

DONT STAY LURKING AS A GUEST,

JOIN TEF AND BENEFIT FROM MEMBERSHIP:

CLICK HERE TO JOIN.
  •  
     
     
Countdown To Christmas!
 

 
  • 0

30mA elcb


dave2

Question

Got a call from a customer as the whole house has no electricity.

Problem was a faulty hot tub which I was loathe to investigate.

The system is TT.

There is an old 30mA elcb bakelite type rcd between the meter and metal cu.

The cable from meter to elcb is 10mm and from rcd to cu is 25mm!

The cu is a split load with an RCD protecting sockets etc.

However any fault on sockets etc causes the elcb and rcd both to trip hence all power is lost to house.

I propose to change the 10mm cable to 25mm.

I also propose to change the elcb with a time delayed 100mA rcd but would this be acceptable under 17th edition?

Also what about the additional protection required to meter tails when using a metal cu?

Any ideas?

Dave

Link to comment
Share on other sites
 

2 answers to this question

Recommended Posts

Andy™

IIRC, metallic DB's on TT must be 30mA RCD'd before the DB

Link to comment
Share on other sites
 

plus, the 30mA cover is necessary for all circuits.

Link to comment
Share on other sites
 

Archived

This topic is now archived and is closed to further replies.

×
  • Create New...

Important Information

Terms of UseWe have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.