RCD rating too low

[roukel01]

Went to inspect a rented property the other day.

TNC-S, Consumer unit has RCD as main switch protecting all circuits. Not too keen on the idea of one RCD (16th edition install about 10 years old), but anyway that wasn't really my concearn. The RCD was only rated at 63amps and it had the following circuits connected:

45amp cooker circuit
4 x 32amp ring circuits
4 x 6amp lighting circuits

although the RCD didn't show any signs of burning out etc, I gave it a code 2 as I think it requires uprating to at least an 80amp RCD.

Now, if I get the go ahead to change the RCD, because I am altering the board slightly, am I required to bring it upto 17th edition (ie split the circuits up onto two RCD's or pop the circuits on RCBO's) or can I simply change the existing RCD for an 80amp type???

Thanks all

 

[Octopus]

What size is the main fuse? If its 60 or 80 amp i'm of the opinion that its a code 4

 

[roukel01]

To be honest, i didn't look inside the holder

 

[Octopus]

Not sure how you could justify a code 2 without confirming the size of the main fuse.

 

[IQ Electrical]

Not sure how you could justify a code 2 without confirming the size of the main fuse.

I agree but even more importantly, the installation has been in use for 10 years without any signs of damage and with diversity, that 63A rated device will be more than adequate. Code 4 for me.

 

[roukel01]

80A Fuse. Maximum demand way over rating of RCD, therefore I decided code 2.