UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old November 26th 04, 11:01 PM
 
Posts: n/a
Default RCD trip times

Testing an RCD (part of a split-load CU) I found that at the rated
current (30mA) it would trip anywhere between 16-17ms to not at all
(even with the meter set to the 2s range). Suspecting the RCD I swapped
in another from a spare box (same make - Clipsal - but almost certainly
different batch as I bought them at different times from different
suppliers). However the other RCD showed much the same behaviour. Both
tripped reliably at 50mA.
Is this typical, or are both faulty? (Is Clipsal crap? :-)


  #3   Report Post  
Old November 26th 04, 11:48 PM
BigWallop
 
Posts: n/a
Default


wrote in message
oups.com...
Testing an RCD (part of a split-load CU) I found that at the rated
current (30mA) it would trip anywhere between 16-17ms to not at all
(even with the meter set to the 2s range). Suspecting the RCD I swapped
in another from a spare box (same make - Clipsal - but almost certainly
different batch as I bought them at different times from different
suppliers). However the other RCD showed much the same behaviour. Both
tripped reliably at 50mA.
Is this typical, or are both faulty? (Is Clipsal crap? :-)


When was the test meter last calibrated? Is the battery still good, or is
it a mains operated test meter? It could be your meter and not the RCD's
you know. The most reliable test gear is connected across the supply and
doesn't rely on a battery.

The mains operated test meters have crimp ends which connect with main
supply leads to the RCD switching. Then the test leads are connected across
the consumer side of the same switch. It then slowly increases the current
to a point where it causes the RCD to trip out. They then store the info'
on the display for easy reading after they're disconnected. They do have a
battery to make the display work and keep the NVM chip working after
disconnection, but they don't rely solely on a battery for the full test.

They're also very expensive, especially if you have to buy three like we
did.


  #7   Report Post  
Old November 27th 04, 06:47 PM
Stephen Dawson
 
Posts: n/a
Default


"BigWallop" wrote in message
. uk...

wrote in message
oups.com...
Testing an RCD (part of a split-load CU) I found that at the rated
current (30mA) it would trip anywhere between 16-17ms to not at all
(even with the meter set to the 2s range). Suspecting the RCD I swapped
in another from a spare box (same make - Clipsal - but almost certainly
different batch as I bought them at different times from different
suppliers). However the other RCD showed much the same behaviour. Both
tripped reliably at 50mA.
Is this typical, or are both faulty? (Is Clipsal crap? :-)


When was the test meter last calibrated? Is the battery still good, or is
it a mains operated test meter? It could be your meter and not the RCD's
you know. The most reliable test gear is connected across the supply and
doesn't rely on a battery.

The mains operated test meters have crimp ends which connect with main
supply leads to the RCD switching. Then the test leads are connected
across
the consumer side of the same switch. It then slowly increases the
current
to a point where it causes the RCD to trip out. They then store the info'
on the display for easy reading after they're disconnected. They do have
a
battery to make the display work and keep the NVM chip working after
disconnection, but they don't rely solely on a battery for the full test.

They're also very expensive, especially if you have to buy three like we
did.



The question is very loose.

Climbing up on to high horse :-)

If you do not know how to carry out the test that you are doing, then you
will have no idea how to understand to results and whether they are good or
bad.

This is why you should employ a competent electrician to carry out this kind
of work. If you were competent to do this work you would not be asking this
question.

Climbs off high horse.

Stephen Dawson


  #9   Report Post  
Old November 28th 04, 04:12 AM
John Rumm
 
Posts: n/a
Default

Stephen Dawson wrote:

The question is very loose.


Which one? The OPs description seemed to contain all the detail required.

Climbing up on to high horse :-)


If you do not know how to carry out the test that you are doing, then you
will have no idea how to understand to results and whether they are good or
bad.

This is why you should employ a competent electrician to carry out this kind
of work. If you were competent to do this work you would not be asking this
question.


What a spectacularly useless comment.

ISTM that the OP had the right test gear, knew how to use it, and knew
what results to expect.

Climbs off high horse.


Looks a bit like an ass from this angle....


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Circuit breaker did not trip balboni Home Repair 9 September 15th 04 12:08 AM
RCD or not to RCD ... Rick Hughes UK diy 53 August 13th 04 06:04 PM
plug removal causing CB trip Sam Home Repair 5 October 31st 03 08:43 PM
Screw Fix delivery times Maximus Glutimus UK diy 27 September 2nd 03 11:36 PM
external lights setting off trip paul wood UK diy 5 July 25th 03 08:46 AM


All times are GMT +1. The time now is 05:11 AM.

Powered by vBulletin® Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017