Zs on ASD light fitting ..

[Danny]

Just fitted a new circuit for an outside light ... ASD twin 9w low energy bulkhead, 2-way switched (inside & out) .. circuit governed by standalone photocell ..

Two things came out of this ... have to put a temp link across the live and switched live of the photocell for R1+R2 as the unit needs to be energised to latch ...

secondly, can't for the life of me get my leads on the surprisingly well covered terminals in the bulkhead for a Zs test so can the Zs be taken at the switch with appropriate comments on the test sheet ?

Di-log MF tester, three lead test ...

 

[SPECIAL LOCATION]

Just fitted a new circuit for an outside light ... ASD twin 9w low energy bulkhead, 2-way switched (inside & out) .. circuit governed by standalone photocell .. Two things came out of this ... have to put a temp link across the live and switched live of the photocell for R1+R2 as the unit needs to be energised to latch ...

secondly, can't for the life of me get my leads on the surprisingly well covered terminals in the bulkhead for a Zs test so can the Zs be taken at the switch with appropriate comments on the test sheet ?

Di-log MF tester, three lead test ...

How far is the switch from the light?

a] another couple of metres isn't going to make a fat lot of difference to your readings!

b] you could always disconnect the lamp itself so you have the exposed wires to connect onto with croc clips or a bit of terminal block?

 

[Andy™]

test at incoming terminals. those connectors are awkward

the 20cm of cable your not testing wont make much difference

 

[green-hornet]

I am unfamiliar with that tester so can only generalise on the test itself.

Some of my testing is done at first fix, or before final fittings are connected.

I have learned throughout the years that its a pain in the bum to disconnect, or try to get probes into awkward places to carry out some tests.

measured Zs could have been done with care(ITS LIVE) before final fixing.

The other method which is still acceptable is to calculate Zs, in your example I would calculate Zs rather than direct measurement.

 

[Danny]

Thanks gents ..

the switch is about 3m from the light and the Zs reading from there is spot on for the calculations ... i guessed the other option would be to take the wires out as you say and croc clip but of course it was all snugly fitted away before i thought of this and i was just trying think outside of the box .. one to put in the experience library ..

In any case, question answered so thanks again ..

 

[SPECIAL LOCATION]

I am unfamiliar with that tester so can only generalise on the test itself.Some of my testing is done at first fix, or before final fittings are connected.

I have learned throughout the years that its a pain in the bum to disconnect, or try to get probes into awkward places to carry out some tests.

measured Zs could have been done with care(ITS LIVE) before final fixing.

The other method which is still acceptable is to calculate Zs, in your example I would calculate Zs rather than direct measurement.

Indeed GH!

Quite often with light fittings I don't bother with reading the Zs,

just add my R1+R2's to my Ze.

as per Page 49 GN3

2.7.14 point 1.

or

On Site guide page 87

10.3.6

I do Zs @ sockets where its easier

I like an easy life! ; \

 

[green-hornet]

Indeed GH!Quite often with light fittings I don't bother with reading the Zs,

just add my R1+R2's to my Ze.

as per Page 49 GN3

2.7.14 point 1.

or

On Site guide page 87

10.3.6

I do Zs @ sockets where its easier

I like an easy life! ; \

Have I told you of my new way to test RCD trip times?



Oh yeah it was you who told me

:^O :^O:^O:^O