RCD's on TT installation

[R1Electrical]

16th edition

100mA mainswitch

30mA RCD

17th edition

30mA RCD

30mA RCD

Do you then still make the mainswitch 100mA ? ?

Any assistance much appreciated

Many thanks

 

[Andy™]

Dual split loads have a 60947-3 main switch feeding 61008 RCD's. No need for 100mA. and this board can be used for TT & TN systems

 

[NozSpark]

R1.... why not introduce yourself?????

So long as all the outgoing circuits are RCD protected then you do not need a 100mA TD main switch

 

[green-hornet]

andy I think he was refering to a TT instalation.

There is little diference between 16th and 17th editions, most of which is definition.

 

[Andy™]

andy I think he was refering to a TT instalation.There is little diference between 16th and 17th editions, most of which is definition.

i though he wanted to know if a dual split still needed 100mA.... have made first post a bit clearer now

 

[batty]

Look at osg it shows options on tt install. Welcome to the forum R1 are you related to R2 D2.

Batty

:coat

 

[Andy™]

Look at osg it shows options on tt install. Welcome to the forum R1 are you related to R2 D2.Batty

:coat

or maybe Rn

:coat

 

[green-hornet]

Applaud Smiley:coat

Look at osg it shows options on tt install. Welcome to the forum R1 are you related to R2 D2.Batty

:coat

 

[wozz]

if the fuseboard is metal u may need a 100mA RCD to protect the tails entering the board, or one of those special grommets i have yet to find

 

[batty]

if the fuseboard is metal u may need a 100mA RCD to protect the tails entering the board, or one of those special grommets i have yet to find

Wozz

Just use a 32mm nylon gland. I always use glands on metalclad boards.

Batty

 

[Andy™]

WozzJust use a 32mm nylon gland. I always use glands on metalclad boards.

Batty

doesnt it say something about it must be RCD'd before a metalclad board regardless of if it has a gland or not?

 

[batty]

doesnt it say something about it must be RCD'd before a metalclad board regardless of if it has a gland or not?

Not in old regs I think but I have been wrong on occasions.

Batty

 

[R1Electrical]

Hello everyone, thanks for all your comments and I apologise for not introducing myself. It's Graham and no no relation ha ha. Sorry if my post didnt make sense, let me try again. What I was trying to say was with the old 16th edition regs when installing a split load c/u on a TT system we used to put a 100mA mainswitch and then a 30mA RCD. Now with the new 17th edition regs you have a mainswitch and two 30mA RCD's. So does that mean the mainswitch still has to be 100mA as well as with the two 30mA RCD's? I understand as long as each outgoing circuit is RCD protected where applicable. I have actually looked in the osg but it only shows a mainswitch. Is that a bit clearer as to what I am trying to get at? Let me know thanks

 

[batty]

Graham as long as enclosure is insulated main switch does not have to be an Rcd anymore. You could use either one with two Rcd's or a high integrity one which allows for putting Rcbo's on immersion and cooker and two Rcd's for other circuits. I hope this helps.

Batty

Or one with all Rcbo's in it if customer will pay

 

[R1Electrical]

Thanks Batty, that is exactly what I thought but it was one of those things when you doubt yourself if you know what I mean? How you finding the work situation at the moment?

 

[batty]

Thanks Batty, that is exactly what I thought but it was one of those things when you doubt yourself if you know what I mean? How you finding the work situation at the moment?

I am flat out, recession what recession. It all could change you have just got to keep plodding on. Hows things with you.

Batty