rcd regs

[cardiy]

Do all new rcds fitted now have to be 30ma?

 

[ericmark]

Simple answer "No" but what it does say

415.1.1 The use of RCDs with a rated residual operating current (I∆n) not exceeding 30 mA and an operating time not exceeding 40 ms at a residual current of 5 I∆n is recognised in a.c. systems as additional protection in the event of failure of the provision for basic protection and/or the provision for fault protection or carelessness by users.

Which means if the reason for an RCD is to protect against shock then 30ma or less. For fire 300ma is recommended.
For automatic disconnection of supply because the earth loop impedance is not good enough you have to calculate. Norm was 100ma because of 1/3 rule.

 

[Steve]

Do all new rcds fitted now have to be 30ma?

It depends what you're using it for.

 

[cardiy]

For domestic on consumer unit sockets lights etc.

 

[electronicsuk]

For domestic on consumer unit sockets lights etc.

It's more or less impossible to get away without 30mA RCDs protecting the majority of circuits on a new domestic installation. If you're installing 13A sockets for general use in a domestic setting then you have no choice but to 30mA RCD protect (be it at the CU or the sockets themselves).

 

[Steve]

For domestic on consumer unit sockets lights etc.

That clears that up then.

 

[ban-all-sheds]

Hmm....

http://www.diynot.com/forums/viewtopic.php?t=218021

http://www.diynot.com/forums/viewtopic.php?t=218423

And now this.

What's going on, I wonder?

 

[LoveRocket]

Hmm....

http://www.diynot.com/forums/viewtopic.php?t=218021

http://www.diynot.com/forums/viewtopic.php?t=218423

And now this.

What's going on, I wonder?

It would appear that someone is asking electrical questions on an electrical forum.