time delay rcds

[Farmelectrics]

were would you use a time delay rcd and what are the benefits of doing so is it just in tt installations

 

[JD6400]

i thought you needed the 100ma as main switch if the cu was metal.that seems the norm on the ones ive seen

I may be wrong , but if using a metal cu it will need a insulated shield around the incoming part / section of the cu to give extra protection to the tails before the rcd .
This may not be applicable now days , but it seemed to be standard practise on nearly all of the older TT boards i have come across ?
I hope you do not mind me asking Engineer54 ,or anyone else to that matter .
Was this the case in the past or have i been misguided to believe so ?

 

[alarm man]

I think your right there, but it would still have to be an S type, if you wanted to maintain discrimination!!

sorry e54 forgot to add s type

 

[alarm man]

I may be wrong , but if using a metal cu it will need a insulated shield around the incoming part / section of the cu to give extra protection to the tails before the rcd .
This may not be applicable now days , but it seemed to be standard practise on nearly all of the older TT boards i have come across ?
I hope you do not mind me asking Engineer54 ,or anyone else to that matter .
Was this the case in the past or have i been misguided to believe so ?

i think the 100ma is to protect the tails on metal clad boards,tho it may be omitted now if using insulated seals as you say but dont quote me on that

unlike the pic shown in the onsite guide,the 100ma was normally a stand alone unit placed between the meter and the cu if metal clad,the main switch was a standard main switch in the cu.

 

[JD6400]

Sorry Alarm man , got the wrong end of the stick with your post .
I took it that you meant the main switch was in the cu and not a stand alone !:49:

 

[alarm man]

Sorry Alarm man , got the wrong end of the stick with your post .
I took it that you meant the main switch was in the cu and not a stand alone !:49:

sorry thats why i edited mate,did sound confusing..

to edit again,the osg pic of tt is confusing too,just states additional protection required in using metal clad cu,so as you said insulated glanding into board,(ive read it somewhere) or swap the 100ma in the cu with a main switch and fit a s/a 100ma between the meter and cu