Voltage Trips

[huntos33]

Just wondering how sensitive the old crabtree voltage trips are compaired to a RCD ?

 

[Kenny.]

Copy of 1st regs, Wonder how long it took them to make an ammendment :smilewinkgrin:

 

[trev]

2 pages?....flippin class

 

[Knobhead]

HeHe, Britannia and Married joints. Did them as an apprentice!

 

[Engineer54]

It'll be interesting to see the second edition, just to see how much more they deemed needed to be included over the first edition!! lol!!!

 

[Top Cat]

Testing of a VO ELCB, taken from the 14th Ed.......


"For the purpose of this test a voltage not exceeding 45 volts, obtained from a double-wound transformer connected to the mains supply, shall be applied across the neutral and earth terminals (or neutral and frame terminals of a voltage-operated earth-leakage circuit-breaker) and the circuit-breaker shall trip instantaneously. The transformer shall preferably have a short-time rating of not less than 750VA (see Figures 2 and 3).

When, in accordance with the requirements of Regulations D.10-13, cross-bonding to other services is carried out in an installation where a voltage-operated earth-leakage circuit-breaker is provided, this may result in a direct earth connection of low impedance being introduced in parallel with the path through the earth-leakage circuit-breaker. Thus an increased value of earth-leakage current would need to flow before the circuit-breaker came into operation, and in some instances the cross-bonding may well remedy the deficiency which originally gave rise to the need for the earth-leakage circuit-breaker. These effects are not harmful; it is common practice to use the best solid earth available (e.g. suitably spaced earth electrodes) in parallel with an earth-leakage circuit-breaker. The circuit-breaker would still be effective in preventing the exposed metalwork of the installation from rising to a dangerous voltage".

I'm sure we just put our Drumond test lamp (or flex/lampholder/lamp) across live and earth, if it tripped, job's a goodun.

 

[Knobhead]

I'm sure we just put our Drumond test lamp (or flex/lampholder/lamp) across live and earth, if it tripped, job's a goodun.

Is there another way?

Never trusted a Drummond though

 

[Top Cat]

Is there another way?

Never trusted a Drummond though

Funnily enough i have just bought my first Drumond since i left the MEB about 25 years ago, now it is LED it doesn't trip an RCD when going live to earth and that's realy handy!

 

[Knobhead]

They were isued to all our electricians mates. One failed on another works so that was it, all withdrawn. I threw a box full of them in to one of our kilns.

Didn't know they were still going.

 

[GLENNSPARK]

They were isued to all our electricians mates. One failed on another works so that was it, all withdrawn. I threw a box full of them in to one of our kilns.

Didn't know they were still going.

yep...can still get em Tony....but not all proving units will light em up though....

 

[Engineer54]

Drummond voltage testers were the ONLY test lamps allowed to be used in our company during my training. They were issued to all the trainee electricians. The old Square D solenoid voltage testers were issued to all the qualified electricians.

The Drummond's were i know, the standard issue to both the old Essex and the London electricity board electricians, could still be the standard issue too. Now they are some of the most expensive voltage testers on the market, ...i just had a quick look!! lol!!!

 

[Knobhead]

Still I chucked 20+ of them in to a firery hell to end their days.
I don't know what happened when the one failed, but orders came from on high "Get Rid"

 

[Engineer54]

Still I chucked 20+ of them in to a firery hell to end their days.
I don't know what happened when the one failed, but orders came from on high "Get Rid"

Haha... there is a good chance that i still have mine in the UK, I know i still have the Square D tester ...Somewhere!! lol!!

 

[GLENNSPARK]

Drummond voltage testers were the ONLY test lamps allowed to be used in our company during my training. They were issued to all the trainee electricians. The old Square D solenoid voltage testers were issued to all the qualified electricians.

The Drummond's were i know, the standard issue to both the old Essex and the London electricity board electricians, could still be the standard issue too. Now they are some of the most expensive voltage testers on the market, ...i just had a quick look!! lol!!!

wiggys!!....saw one on the bootsale a bit back....they keep cropping up on fleabay n all.....

 

[telectrix]

Drummond MTL7 Test Lamp - John Drummond Voltage Test Lamp

from test-meter, no less.

 

[Engineer54]

They have certainly been around for an awful long time now, but then quality usually speaks for itself. Perhaps any DNO electricians on here, can confirm or not that these Drummond's are still being issued??