Thought I'd start a sticky post on the 17th edition changes, basically just list of all the regs which have changed, be as detailed as you like really, hopefully it'll become a decent reference post for you look upon in the furture months before it comes into action. Type away...........
- Thread starter LukeScotty
- Start date
old dog
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411.4.5
where compliance with this regulation by an rcd the disconnection times
in accordance with table 41.1 relate to prospective residual fault currents
higher than the rated residual operating current of the rcd
(typically 2 IAn)
just got my head round this checked my meter was capable of 2x rcd
test thought thats what meant
this has now been amended and removed iet site has the list of amendments
bought the book passed the exam and i am out of date already
where compliance with this regulation by an rcd the disconnection times
in accordance with table 41.1 relate to prospective residual fault currents
higher than the rated residual operating current of the rcd
(typically 2 IAn)
just got my head round this checked my meter was capable of 2x rcd
test thought thats what meant
this has now been amended and removed iet site has the list of amendments
bought the book passed the exam and i am out of date already
S
Shakey
it has not been ammended
If it had we would now be working to BS7671:2008 ammended to 2008 or something
It has been corrigendumed
silly boy
old dog
-
it was late could not spell corrigendumed but i think you got my driftit has not been ammended
If it had we would now be working to BS7671:2008 ammended to 2008 or something
It has been corrigendumed
silly boy
my mum god rest her told me son never use a word you cant spell
i dont say much these days
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A
a.walk
Hi Darius, you don't pay for printing the book, because that costs pennies, you pay for the author rights, if they only wanted to make it cheaper they would publish it on the internet, so anybody could print it and have it next day on site, you get thicker books with better quality paper for 20 quid. It only costs £65 because the knew it was going to be a bestseller this year, so why give up the profit, all sparks are used to paying that much for a book anyway
S
Shakey
well nothing has changed regarding junction boxes, the same rules apply, they must be accessible for maintenance and inspection etc etc
S
Shakey
presumably you mean the requirement to verify that the phase sequence is maintained?
dont know what level you are at (so i will assume you dont know)
in a three phase sytem, each phase is angularly 120 degrees apart. the order that these phases 'peak' in (their waveforms) is the phase sequence
in old money, this was conventionally Red-Yellow-Blue, or L1, L2 L3.
The requirement is to verify that if it starts in that order it should finish in that order, with the main problem of motors running in reverse DOR if it doesnt.
B
bigal
Thanks for getting back guys
Context is 2 fold: 1) PIR certificate askes for 'verification of phase sequence' What's the test process for this?. 2) reg 612.12: 'For multiphase circuits, it shall be verified that the phase sequence is maintained'? Is this a good enough explanation?
Cheers in anticipation of your replies.
big al
Context is 2 fold: 1) PIR certificate askes for 'verification of phase sequence' What's the test process for this?. 2) reg 612.12: 'For multiphase circuits, it shall be verified that the phase sequence is maintained'? Is this a good enough explanation?
Cheers in anticipation of your replies.
big al
S
Shakey
common mis-conception Big Al, it says VERIFY, not test.
If i look at one end of a run of SWA,(for example)
and the conductors are labelled, and connected to L1, L2 and L3, and i look at the other end, and they are the same, then i have verified that the phase sequence is maintained. Of course you could do a live test (f you have phase sequence or phase rotation on your meter), you could also dead test (by doing R1+R2 checks on each relevanet phase) or just look as i have said
B
brook
What do you have to do with your 16th edition testers??
I need to purchase one and the little man in the shop said that he had no 16th edition ones in stock and he was waiting for the 17thedition ones to come in.
---------
Brook
Sreevysh Corp
I need to purchase one and the little man in the shop said that he had no 16th edition ones in stock and he was waiting for the 17thedition ones to come in.
---------
Brook
Sreevysh Corp
The 17th Ed requires you to verify the phase rotation (or sequence) on the part of the system upon which you are working. Newer testers have this facility BUT voltage testers are already available that have this facility built in (albeit a cut down version) for about £30-£40 so don`t ditch your 16th Ed test equipment, there`s nothing wrong with it, just buy a small tester for the odd occasion you need to work on three phase.
If anyone`s interested I can sell them a single phase rotation tester for £200.
If anyone`s interested I can sell them a single phase rotation tester for £200.
C
city spark
So Tony are you saying that if your supply cable to freezer is not sunk more than 5 cm or earthed conduit the it must be protected or is this still an exception
There seems to be some confusion with regard to the requirements of the 17th Ed.
The 16th Ed required rcd protection of any 13A socket outlets supplying equipment outside the EBZ.
The 17th Ed requires rcd protection of ALL 13A socket outlets. In addition, the 17th Ed requires the protection of CABLES BURIED <50mm WITHIN THE FABRIC OF THE BUILDING. There are a few exceptions, one of which is socket outlets for specific pieces of equipment - but the requirement for the protection of the cable remains, hence the earthed mechanical protection or surface mounting methods can be employed, rather than removing the majority of the wall to sink a cable >50mm.
The 16th Ed required rcd protection of any 13A socket outlets supplying equipment outside the EBZ.
The 17th Ed requires rcd protection of ALL 13A socket outlets. In addition, the 17th Ed requires the protection of CABLES BURIED <50mm WITHIN THE FABRIC OF THE BUILDING. There are a few exceptions, one of which is socket outlets for specific pieces of equipment - but the requirement for the protection of the cable remains, hence the earthed mechanical protection or surface mounting methods can be employed, rather than removing the majority of the wall to sink a cable >50mm.
M
mdes
Check out the new ashley brochure it would let you think otherwise
K
Kris
You can use MI or SWA instead of conduit if you want but who the hell is gonna wanna do that. Can you imagine the customers face when you give him a quote to rewire his house in pyro!
Check out the new ashley brochure it would let you think otherwise
Well they would say that wouldn`t they.
A
accable
What you have got to realise is that they get you 2 ways when installing a socket in a dwelling.
1. Installing the cable, if you use twin & earth then it if it’s less than 50mm deep it must be in the prescribed zones plus RCD protected. To avoid RCD protecting the cable it can be pyro, armoured or to BS 7436 (it looks like FP200 but its not) you could also run the cable in earthed conduit.
2. Then there is the socket, to avoid using an RCD you could suitably label the socket say “freezer only”
Tonyc
1. Installing the cable, if you use twin & earth then it if it’s less than 50mm deep it must be in the prescribed zones plus RCD protected. To avoid RCD protecting the cable it can be pyro, armoured or to BS 7436 (it looks like FP200 but its not) you could also run the cable in earthed conduit.
2. Then there is the socket, to avoid using an RCD you could suitably label the socket say “freezer only”
Tonyc
A
accable
Hi welshmadness
You are quite right, metal capping is to protect the cable from damage that could be caused by the plasterers trowel.
To provide mechanical protection to comply with regulation 522.6.6 (iv) you would require metal plate at the very least 3-4mm thick and then that will not provide you protection from shot fired nails.
Tonyc
You are quite right, metal capping is to protect the cable from damage that could be caused by the plasterers trowel.
To provide mechanical protection to comply with regulation 522.6.6 (iv) you would require metal plate at the very least 3-4mm thick and then that will not provide you protection from shot fired nails.
Tonyc
D
dkent5
17th edition test equipment.....Ha ha ha ha ha ha ha....oh my word!......hee hee ho ho!
A superb marketing technique to take cash off the unwitting.
I get my multitester Fluke calibrated every year at the same place and even they're not dumb enough to try and sell me one of these new 17th bits of kit.
A superb marketing technique to take cash off the unwitting.
I get my multitester Fluke calibrated every year at the same place and even they're not dumb enough to try and sell me one of these new 17th bits of kit.
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P
Plan
The only difference I can see between 16th & 17th edition testers are the multi function all in one testers that download all fixed info onto computer then generate cert from that. The prob is the change in zs values. Before buying new kit it maybe (?) possible to get hardware upgrade from manufacturer website
I know of no regulation that says a JB requires a tool to open it
The new JB from Hager just snap close
Have a look at 416.2.4 in BRB
M
matthunt
As a matter of interest to people taking or about to take their 17th Edition course, all final circuits now have a maximum disconnection time of 0.4 seconds (i.e. lighting circuits)as per table 41.2, however table 41.4 allows for 5 second disconnection for circuits down to 6amp, please read regulation 411.3.2.3 in conjunction with this table as this table is for Distridution circuits, (Sub-Mains). Most will be aware of this but some during revision will overlook.
M
Mark2009
Hi
20A Breaker for Sockets with RCD this is only if its a Radial, A Ring i would still use 32A with RCD from what i know all sockets will be Radial very soon to keep in with Europe.
Thanks
Mark
A
anil
thank you]Thought I'd start a sticky post on the 17th edition changes, basically just list of all the regs which have changed, be as detailed as you like really, hopefully it'll become a decent reference post for you look upon in the furture months before it comes into action. Type away...........[/QUOTE]OFFICIAL SPONSORS
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