Belling out

[Chapperz]

Stupid question probably but... If someone was to bell out a circuit to find a fault, should they disconnect from the board and why? Also, if a light on a two way and intermediate stays o. Perminately would that be due to the strappers being mixed up?

Thanks people

Regards

 

[littlespark]

To bell out, is the old way of testing for continuity, and it was a simple doorbell circuit.

nowadays, a multi function tester can send anything up to 1000v down the wire, so not only does the circuit need disconnected from mains, but any electronics or other devices need disconnected from the circuit. Ie, smoke alarms, led lights, anything that can be unplugged!

the question of two way lighting… it is unclear if you mean always off, or always on… maybe edit the post?

if always on, then the supply feed is connected to the switchwire and the switches aren’t doing anything.
mixing up the strappers would cause the light to work on one switch but not the other. Ie a strapper is connected to either the feed or the switchwire.

 

[Dustydazzler]

As above 'belling out' using a battery door bell was to prove a pair of cables were simply continuos with no breaks in either wire

 

[UNG]

When I saw the header I thought this was a thread about cookers ??

I find one of these Continuity testers very useful and it is also cheap

 

[Chapperz]

To bell out, is the old way of testing for continuity, and it was a simple doorbell circuit.

nowadays, a multi function tester can send anything up to 1000v down the wire, so not only does the circuit need disconnected from mains, but any electronics or other devices need disconnected from the circuit. Ie, smoke alarms, led lights, anything that can be unplugged!

the question of two way lighting… it is unclear if you mean always off, or always on… maybe edit the post?

if always on, then the supply feed is connected to the switchwire and the switches aren’t doing anything.
mixing up the strappers would cause the light to work on one switch but not the other. Ie a strapper is connected to either the feed or the switchwire.

Thanks for the reply
Got it sorted... Testing between neutral and live with a lamp in.

 

[Dustydazzler]

Good ole live testing with a bulb on 2 bits of bell wire ?

 

[7029 dave]

When we tested end to end ring continuity, it was with bell and battery at college.

 

[Petej999]

When we tested end to end ring continuity, it was with bell and battery at college.

Times and methods change Mate

 

[edexlab]

Still widely used in India!

I showed the guy my modern version he turned his nose up at it

 

[7029 dave]

Times and methods change Mate

Yes they do, was just giving some info to younger members.

 

[telectrix]

Times and methods change Mate

advances in technology.cvwe now have these wonderful machines. batteries not required, and the magic needle eliminates the need for buzzer:

 

[littlespark]

Made in Scotland by the looks of it?
Advertised as the “wee” megger.

 

[Julie.]

advances in technology.cvwe now have these wonderful machines. batteries not required, and the magic needle eliminates the need for buzzer:

View attachment 88887

Didn't we all start off with one of these??

Still have mine!

Nothing wrong with the term belling out, for simple end to end identification of cores/connections I frequently use the fluke multimeter on diode setting - it buzzes when connectivity is made.

 

[pc1966]

I have a Martindale voltage tester that also bleeps on continuity.

Good point is it also warns you of a live circuit without blowing up (different bleep)

Bad point is you jump with proving dead as it bleeps until you remember it is the 'safe' bleep sound...

 

[Julie.]

I have a Martindale voltage tester that also bleeps on continuity.

Good point is it also warns you of a live circuit without blowing up (different bleep)

Bad point is you jump with proving dead as it bleeps until you remember it is the 'safe' bleep sound...

My megger one does the same, and yes I jump in panic exactly the same!