I was thinking 2 ways to do this i think the best is to split the tails and go into a rcd shower unit and feed the shower so its completely seperate from the rewirable box .The second way was to come out of a rewirable fuse (i know it will be 30 or 40 amp plug in rewirable breakers with 6mm or 10mm cable into a rcd shower unit soon as snd doing it that way as an addition?Im not doing this job just if i come across it is the 2nd way ok?
Shower Circuit When Keeping A Rewirable Board
- Thread starter r.b
- Start date
Help Support Talk Electrician Forum:
Just remember that a lot of the 3036 boards are only rated at 60A and that 40A MCBs only fit the No.1 way
Don't you down rate 3036s for showers? I'm sure I read something about that on the shower installation manual?
Don't forget to ARSEEDEE!!!
Don't forget to ARSEEDEE!!!
OK, If you do happen to come across what someone else has done with their shower installation you might find they have ignored the 3036 board and fitted Henley blocks to the tails and fitted a shower board which will have an RCD in it along with the appropriate MCB .
Or another person you might come across as you pass along life's great highway, may have changed the 3036 to a HRC fuse and then a seperate RCD .
Or another person, nothing to do with the first two people , may have changed the whole board AND upgraded the bonding .
Or theres this other guy I come across often , who just connects the shower to a 30A rewirable, ignores the Arseedee & thinks he.s done a good job.
Or another person you might come across as you pass along life's great highway, may have changed the 3036 to a HRC fuse and then a seperate RCD .
Or another person, nothing to do with the first two people , may have changed the whole board AND upgraded the bonding .
Or theres this other guy I come across often , who just connects the shower to a 30A rewirable, ignores the Arseedee & thinks he.s done a good job.
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2nd way is OK. Rewireable fuses are still legit for cable protection against overload, and you've added RCD for compliance with manufacturers warranties.
Its just with the 1st way i dont know about the tail sizing going to the shower unit after henley blocking it off the existing tails.normally on a new install its a minimum of 25mm according to the on site guide but on existing rewirable it will be 16mm more than likely.This is what i dont get because on the 1st way on a new install it will be 16mm and 25mm in the henley block.What im saying is does it have to be 25mm because of what the on site guide says for instance 10mm plus 16mm tails are cheaper as long as it takes the amps what do you think just keep everything the same 16mm?
erm... on-site guide. the clue is in the name
Right, usually, you have to have an OCPD for a circuit installed at the point where the cable size or current carrying capacity reduces. HOWEVER, you do NOT have to. I cannot remember the reg number, but the OCPD can be within three metres of the point where current carrying capacity reduces, PROVIDED that the chance of anything going wrong in the intervening three metres in low. This is the basis of the rule the DNO's have about max length of tails to be 3 metres. [Remember now, the cutout 1361 is not there to protect the tails, it is there to protect the service cable [bS7671 does not apply to the DNO]
Sooooo, you can use a cable size from the henleys to the shower unit of whatever size you require based on the rating of the OCPD you install in the shower unit and all will be fine. [i am assuming that whatever a Shower unit is, it incorporates an OCPD as well as the RCD]
john....
Sooooo, you can use a cable size from the henleys to the shower unit of whatever size you require based on the rating of the OCPD you install in the shower unit and all will be fine. [i am assuming that whatever a Shower unit is, it incorporates an OCPD as well as the RCD]
john....
Split the tails, pair if iscos, 6mm tails to shower unit,
Test, give cert to customer.
Job done, pack up, get paid, go home.
Test, give cert to customer.
Job done, pack up, get paid, go home.
Well , as you're not doing the job :innocent its just in case you come across it , these people who have already done the job that you will be looking at may have used 16mm tails from the Henleys which would be fine , you probably don't need to struggle with 25mm in a shower board unit .
So, if you ever come to do the same job yourself , how do you propose to do it ?
Yep. i'm with Steps on this one!!
john..
john..
Holy cow batperson,
Someone agrees with me,
What is the world coming to?!?!?!?! :|
Someone agrees with me,
What is the world coming to?!?!?!?! :|
This is a first Steppers 
Who was that caped crusader? :C
Who was that caped crusader? :C 
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Well it used to be Ravels Bolero that the World was Coming to!......probably 'slap your bitch up" or something now
I am the guilty party, twas me!!
john..!!
john..!!
oh, whoopee doo, and you think your the first to notice that???????
Sharpend
"It Just Is"
Suspect that 'twas the wife then!?
Suspect she wants words with this apprentice chap!!! He has broken the unwritten rule. Punishable by.............Canoeboy said:
A free motorbike!!!!!!!
john..
john..
Blubberman
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25mm tails are usually for connection of consumer units. A separate shower main switch/RCD combo with 50amp MCB may be supplied with 10mm tails provided that they don't go through a wall to be connected to Henley blocks within a meter cabinet.
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