problems

[tom1]

after testing on and off load if it trips to quick does it need replacing

 

[SPECIAL LOCATION]

[1]sounds good but thay will have to pay, the bathroom lights will have to go on another circuit untill then.[2]what about the low ir, could there be something i am mising may be in this jb

what gets me is the cu is quiet new, no lables , [3]no bond to water and they have had other work done recently.

1/ Surely your initial price would include a few quid to cover a few extra boxes Wagos, various fixings etc.. to cover the common place anomalies like this that need terminating...

(ie Every job needs the extra

 

[tom1]

did the bonding first thing,

its more the time than the wagos, whats the biggest wago they do, i will need some big ones,

its one of them houses that looks all nice on the surface but is a right bodge underneth.

the plummer spent most of the day sorting a rad that was fed from the hot water cylinder

 

[SPECIAL LOCATION]

after testing on and off load if it trips to quick does it need replacing

ON load is not going to confirm the manufactures equipment is meeting the required BS specification.

say for example... if 'on load' you already have a 10ma leakage current.

When doing 50% test it trips you would actually testing a (15+10ma) 25ma current.. NOT a 15ma test current, which would NOT prove that the RCD wont trip with 15ma test current.

and when you do a 100% you would be using a (30+10ma) 40ma test current

and when doing a 5xIn test you would actually be doing a (5x30+10ma) 160ma test current

So what are you proving IF you have no idea of any existing leakage current already present on the installation?

"trips to quick"I presume you mean trips at 1/2 trip current...

i.e trips at too LOW a value... not too quickly as in time duration in ms!

an RCD can never operate too quickly at rated current only too slowly..

e.g. in a fault faster the better to save life.

 

[SPECIAL LOCATION]

did the bonding first thing,good Man!Applaud SmileyApplaud Smiley:x

its more the time than the wagos, whats the biggest wago they do, i will need some big ones,

its one of them houses that looks all nice on the surface but is a right bodge underneth.

the plummer spent most of the day sorting a rad that was fed from the hot water cylinder

Wago's

2's 4's 6's & 8's suitable for lighting circuits.

http://www.wagobox.com/shop/pushwire/

3's for socket circuits. (e.g. spur branch off ring! )

you could always strap more than one wago to another if needed!

e.g. 2 x 8's, loose one hole for strapping, you then got a 14-way wago!

 

[tom1]

not a bad idea will need to strap 3 8 ways to gether

 

[batty]

RCD's may well need to WORK under load..But they need to be tested in isolation...

so the circuit doesn't introduce artificially fast operating times!

Page 91 On Site Guide. paragraph 11.1 General Test procedure.

{footnote

there is quite often of the forum the odd bit of barracking about NICEIC making up their own regs & rules....

Yet it very often appears that electricians make up enough of their own rules without any interference from the NICEIC ; \}

Guinness

Monday is tea and cake day not Tuesday.

ROTFWL

 

[green-hornet]

Oh I have not seen them screwits for ages.

I have come across this situation before, where a central position was taken to feed all lights from. Normally overloaded on each connection, and no reliable space for the cpc.

I would go with seperation of the circuit, with continuity checks for the cpc, and the use of suitable enclosures as per Special Locations post.

 

[green-hornet]

{footnote

there is quite often of the forum the odd bit of barracking about NICEIC making up their own regs & rules....

Yet it very often appears that electricians make up enough of their own rules without any interference from the NICEIC}

LOL

 

[a1]

http://www.idealindustries.com/prodDetail.do?prodId=in-sure&div=7&l1=push-in&l2=in-sure

Is the cheaper version that I use - BUT Equally as good.

 

[tom1]

thanks for all the help, i will test the other circuit which happens to be in the same loft and if thats ok will put the lights on that.

i will advise that the other circuit needs sorting and its up to them if they go for it.

the rcd i will test on 1 x and 5 x and write on cert that it trips on half current, unless they want me to change it.

if i do sort the other circuit i will get some wagos or something like them and bind them together in a box.

they also have a mirror that is pir and heated, the instructions are crap, on the back it says 2 x 31 w should i assume that it draws 42w, and i take it a perminent live is needed

 

[SPECIAL LOCATION]

adding lights in bathroom.ir 0.06 L/N to E

must be over looking something its not tripping the rcd.

IR = 0.06MegOhm, or 60KOhm or 60,000ohm.

If voltage = 230V

I=V/R

I = 230/60,000

leakage current = 0.0038amps

way less than 30ma needed to trip the RCD.

R=V/I

R=230/30ma, 230/0.03

R= 7666.6ohm

If full 30ma trip current flowing at supply voltage,

Resistance is still far lower than 0.0076MegOhm!

So your RCD shouldn't trip with 0.06MegOhm.



think thats come out how it should? :|

but me typing fingers and reading eyes are getting a bit confumbrulated!

GuinnessGuinnessGuinnessGuinnessGuinnessGuinnessGuinness

 

[tom1]

late night drunk advise

Can't fault it mate

 

[Apache]

late night drunk advise Can't fault it mate

Is that what you say to all the girls?

 

[tom1]

just tell them what they want here O)e