Lighting circuit problem in WA

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space
b: There is a lag but Western Power can't fix it
c: Something faulty on the board.

Can anyone help me pick a favourite?

One other question. The cabling in the roof space is contained in HPM
boxes but seems to be simply taped together (might be soldered
underneath but I don't want to mess with it). Is that normal practice?
I believe the UK have to have physical connectors in their junction
boxes.

Anyway, sorry for the rambling but I'd be really grateful for some
help

Nick

 

[Phil Allison]

<nick_hobbs@hotmail.com>

Just wondering if anyone can help here.

** Yep - one of your neighbours is using an arc welder.

Car body repairs, metal fabrication etc .....

SFA you can do about it.



...... Phil

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space
b: There is a lag but Western Power can't fix it
c: Something faulty on the board.

Can anyone help me pick a favourite?

One other question. The cabling in the roof space is contained in HPM
boxes but seems to be simply taped together (might be soldered
underneath but I don't want to mess with it). Is that normal practice?
I believe the UK have to have physical connectors in their junction
boxes.

Anyway, sorry for the rambling but I'd be really grateful for some
help

Nick

 

[Mike]

In article <1172147079.102552.3390@q2g2000cwa.googlegroups.com>, nick_hobbs@hotmail.com says...

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

If the power source for the halogen is switch mode it might go into
hysterics due to some local panel beater doing welding in his backyard
on same phase <guh> But since voltage recorder doesnt register it, then
sounds like a dodgy screw joint which interrupts due to magnetic and/or
thermal effects, makes the screw act like a over current/heat switch,
so
a. Drive the lights from somewhere else on the ceiling supply
b. trace back all the fittings, bear in mind some didgy wiring has
breaks *inside* the insulation, they only use cheap single core most of
the time so that is so likely to happen and if its just touching most of
the time then some current draw can be enough for it to go discontinuous
and act like a intermittent, have seen stranger things happen <sigh>

--
Regards
Mike
* VK/VL Commodore FuseRails that wont warp or melt with fuse failure indication
and now with auto 10-15 min timer for engine illumination option.
* VN, VP, VR Models with relay holder in progress.
* Twin Tyres to suit most sedans, trikes and motorcycle sidecars
http://niche.iinet.net.au

 

[carol]

A very rare but possible answer also is that you may have a ham radio
operator in your area with a high powered transmitter. If you are running
fluro lights it is quiet possible to pick up the stray rf signal which makes
the lights glow with the power off. Not sure if it can have any effect on
lights when they are on though. You can hold a fluro above your head in
parts of sth brisbane and get a nice glow going at night.

 

[Phil Allison]

<nick_hobbs@hotmail.com

a: Loose connection in one of the fittings or in the roof space

** That will make a loud crackle in a AM radio tuned between stations.

Try it.


........ Phil

 

[Adrian Jansen]

nick_hobbs@hotmail.com wrote:

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space
b: There is a lag but Western Power can't fix it
c: Something faulty on the board.

Can anyone help me pick a favourite?

One other question. The cabling in the roof space is contained in HPM
boxes but seems to be simply taped together (might be soldered
underneath but I don't want to mess with it). Is that normal practice?
I believe the UK have to have physical connectors in their junction
boxes.

Anyway, sorry for the rambling but I'd be really grateful for some
help

Nick

I would check every fitting for loose screws. Have had several new

fittings with internal wiring between the connector and the bulb socket
simply not connected, or loose.
One bad connection can make all the lights on that circuit jitter as the
load comes on and off.

--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
Note reply address is invalid, convert address above to machine form.

 

[Don McKenzie]

nick_hobbs@hotmail.com wrote:

Just wondering if anyone can help here.

snip---

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

If Western power can't detect it, how about trying to section isolate it
to either mains/switchboard, lighting circuit, or power circuit?

Plug a lead light or bed lamp, into a power outlet in a room you use
most often.

If you catch the lamp flickering at the same rate, then it is mains, or
switchboard, and not a lighting circuit.

Don...





--
Don McKenzie
E-Mail Contact Page: http://www.dontronics.com/e-mail.html

Crystal clear, super bright OLED LCD (128x128) for your microcontroller.
Simple serial RX/TX interface. Many memory sizes.
http://www.dontronics-shop.com/product.php?productid=16460

No More Damn Spam: http://www.wizard-of-oz.com

 

[Don McKenzie]

Don McKenzie wrote:

nick_hobbs@hotmail.com wrote:

Just wondering if anyone can help here.


snip---

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.


If Western power can't detect it, how about trying to section isolate it
to either mains/switchboard, lighting circuit, or power circuit?

Plug a lead light or bed lamp, into a power outlet in a room you use
most often.

If you catch the lamp flickering at the same rate, then it is mains, or
switchboard, and not a lighting circuit.

Don...

just to add to that, or mains induced.
Yes it could be a nearby xmitter, welder, ice manufacturer, etc.

Don...



--
Don McKenzie
E-Mail Contact Page: http://www.dontronics.com/e-mail.html

Crystal clear, super bright OLED LCD (128x128) for your microcontroller.
Simple serial RX/TX interface. Many memory sizes.
http://www.dontronics-shop.com/product.php?productid=16460

No More Damn Spam: http://www.wizard-of-oz.com

 

Thanks for the responses everyone.

I'm going to check every light fitting this weekend and I'll certainly
check lights on power points although I haven't noticed any flicker
from those.

I still think that my neighbours would have the same problem if the
issue were an external influence from a mig, transmitter etc, but the
AM radio test sounds good.

I'll post back with the results, good or bad.

I'm still curious about the the roof space wiring and whether taping
the cable bundles together is standard practice rather than using some
type of screw in junction box. Any thoughts on that?

 

[rebel]

On 22 Feb 2007 20:59:43 -0800, nick_hobbs@hotmail.com wrote:

Thanks for the responses everyone.

I'm going to check every light fitting this weekend and I'll certainly
check lights on power points although I haven't noticed any flicker
from those.

I still think that my neighbours would have the same problem if the
issue were an external influence from a mig, transmitter etc, but the
AM radio test sounds good.

I'll post back with the results, good or bad.

I'm still curious about the the roof space wiring and whether taping
the cable bundles together is standard practice rather than using some
type of screw in junction box. Any thoughts on that?

Probably "bue point" connectors hidden inside the tape, which are quite kosher.

Or could be those twist-on types, which DON'T give a good connection.

 

[Brian g]

<nick_hobbs@hotmail.com> wrote

I'm going to check every light fitting this weekend and I'll certainly
check lights on power points although I haven't noticed any flicker
from those.



****** Got any airconditioning in the house?Perhaps an larger,older style
window unit?

Broken rotor bars in the motor can cause the sort of problem you describe.

Inverter technology air conditioning can cause a similiar problem.

Brian G

 

[Phil Allison]

"Brian g"

I'm going to check every light fitting this weekend and I'll certainly
check lights on power points although I haven't noticed any flicker
from those.



****** Got any airconditioning in the house?Perhaps an larger,older style
window unit?

Broken rotor bars in the motor can cause the sort of problem you describe.

Inverter technology air conditioning can cause a similiar problem.

Brian G

** Hmmmmmm,

that smacks of the "voice of experience" ......




....... Phil


>

 

[Franc Zabkar]

On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space

I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[John G]

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:t0f1u29t9h9ju9rdtfulki612gdc2lt6le@4ax.com...

On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space

I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Australian Rules.
Just had this very problem in a 2 switch plate supplying 2 lights.
At first glance all looked OK but with the power off it turned out the 3
wires in the LOOP terminal on one switch were a bit loose.
Tightened the screw and all is well.

--
John G.

 

[Alan Rutlidge]

"John G" <Greentest@ozemail.com.au> wrote in message
news:4657cbfd$0$18001$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:t0f1u29t9h9ju9rdtfulki612gdc2lt6le@4ax.com...
On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space

I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Australian Rules.
Just had this very problem in a 2 switch plate supplying 2 lights.
At first glance all looked OK but with the power off it turned out the 3
wires in the LOOP terminal on one switch were a bit loose.
Tightened the screw and all is well.

--
John G.

Had the same problem in only one room in the house. After a bit of piss
farting about it turned out to be a dodgy connector that was loose. I
sometimes wonder where some sparkies get their ticket from. -

Cheers,
Alan

 

[atec 7 7]

Alan Rutlidge wrote:

"John G" <Greentest@ozemail.com.au> wrote in message
news:4657cbfd$0$18001$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:t0f1u29t9h9ju9rdtfulki612gdc2lt6le@4ax.com...
On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:

Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space
I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Australian Rules.
Just had this very problem in a 2 switch plate supplying 2 lights.
At first glance all looked OK but with the power off it turned out the 3
wires in the LOOP terminal on one switch were a bit loose.
Tightened the screw and all is well.

--
John G.


Had the same problem in only one room in the house. After a bit of piss
farting about it turned out to be a dodgy connector that was loose. I
sometimes wonder where some sparkies get their ticket from. -

Cheers,
Alan


If you inspected some of the work being done by long term sparkies you

would never employ one again .

 

[Brian g]

"Alan Rutlidge" wrote


Had the same problem in only one room in the house. After a bit of piss
farting about it turned out to be a dodgy connector that was loose.



***** Only a non sparkie would "piss fart" around,anyone who had the
slightest clue would know how to troubleshoot such a small problem!

Brian g

 

[Argusy]

Alan Rutlidge wrote:

"John G" <Greentest@ozemail.com.au> wrote in message
news:4657cbfd$0$18001$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:t0f1u29t9h9ju9rdtfulki612gdc2lt6le@4ax.com...

On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:


Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space

I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Australian Rules.
Just had this very problem in a 2 switch plate supplying 2 lights.
At first glance all looked OK but with the power off it turned out the 3
wires in the LOOP terminal on one switch were a bit loose.
Tightened the screw and all is well.

--
John G.



Had the same problem in only one room in the house. After a bit of piss
farting about it turned out to be a dodgy connector that was loose. I
sometimes wonder where some sparkies get their ticket from. -

Cheers,
Alan

I had three phase power put on my house the same day I had ducted air installed

Not long after, lights in bathroom, toilet, second and third bedrooms would
flicker occasionally

I had a fluoro in third bedroom - take it out - all lights OK.
Put it in and the occasional flicker would come back.
All other lights no problems

The air conditioning sparkies who I called back to fix it (assumption - they
disturbed the wiring while crawling around my roof space) found it interesting
about this intermittent flickering, but couldn't find the problem

I'm getting too old to bugger around in the roof space, but they weren't going
to fix it

So, I, who has an electronics cert (not a sparky ticket in sight) took my 60
year old body and a multimeter into the roof and found the problem in about 15
minutes - it ended up being a loose loop connection in the light in the main
bedroom.

I'd follow Franc's advice if I were you, then call the electricians back after
you've found it, and demand they fix it. That way you get a certificate of
compliance. Tell us how long they took

Argusy

 

[Alan Rutlidge]

"Brian g" <brian.goldsmith@NOSPAMMecho1.com.au> wrote in message
news:m2b6i.4719$wH4.2725@news-server.bigpond.net.au...

"Alan Rutlidge" wrote


Had the same problem in only one room in the house. After a bit of piss
farting about it turned out to be a dodgy connector that was loose.



***** Only a non sparkie would "piss fart" around,anyone who had the
slightest clue would know how to troubleshoot such a small problem!

Brian g

Brian "brainless" g. Get out of the wrong side of bed today?
Perhaps for the totally inept like you I should have put inverted commas
around the piss farting around part.
By "piss farting around" I meant to imply the unnecessary (IMO) task of
having to pull the light assembly and cabling through the hole in the
ceiling to discover the dodgy workmanship. The sparkie in question would
not return to investigate the fault he created by doing a poor installation
job in the first place, so seeing no point in paying for yet another
incompetent f***wit to make things worse I applied a small amount of
attained knowledge and investigated and repaired the fault myself.

Maybe Brian g is one of those sparkies who needs to be out of the industry?
Who knows? Of all the f***wit sparkies I've had to endure over the years I
often wonder how they get their qualifications. Kind of reminds me of my
TAFE relief lecturing days when some stupid apprentice was still convinced
it was okay to check the mains voltage in a switchboard with an el cheapo
multimeter on the 10A current measuring range. Thank God for the big red
isolation button. !!!

Cheers,
Alan

 

[Friday]

Argusy wrote:

Alan Rutlidge wrote:
"John G" <Greentest@ozemail.com.au> wrote in message
news:4657cbfd$0$18001$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:t0f1u29t9h9ju9rdtfulki612gdc2lt6le@4ax.com...

On 22 Feb 2007 04:24:39 -0800, nick_hobbs@hotmail.com put finger to
keyboard and composed:


Just wondering if anyone can help here.

Just had a new house built and we are getting a problem with the
lights flickering. The builder's electricians have changed the circuit
breakers, changed the RCD protecting the lights and have swapped the
circuit to a different phase (we are on 3 phase). No joy.

In a 10 minute period all ceiling lights might flicker for, say 10
seconds or so but it isn't predictable and doesn't appear to be
associated to any particular pattern of power usage. The flicker isn't
major, just enough to be noticeable and irritating. The light fittings
are mixed inluding dichroic, 10w halogen and 60 incandescent.

Western power have been out to check the dome, pole, local transformer
and board saying all were OK. They put a voltage recorder on for 36
hours and didn't detect any sags or spikes outside of the 240-250V
range.

Understandably, the electricians don't want a bar of it but I'm
obviously at a loss.

I'm guessing at
a: Loose connection in one of the fittings or in the roof space

I'd take Don's advice to determine whether or not the problem is
confined to your lighting circuit. If it is, I'd then find out which
light is closest to the breaker and leave this one on while switching
the others off. If the first light doesn't flicker, then keep
switching on more lights until the problem shows up. A high resistance
connection in the circuit should not be a problem until you try to
pass current through it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Australian Rules.
Just had this very problem in a 2 switch plate supplying 2 lights.
At first glance all looked OK but with the power off it turned out
the 3 wires in the LOOP terminal on one switch were a bit loose.
Tightened the screw and all is well.

--
John G.



Had the same problem in only one room in the house. After a bit of
piss farting about it turned out to be a dodgy connector that was
loose. I sometimes wonder where some sparkies get their ticket from.
-

Cheers,
Alan



I had three phase power put on my house the same day I had ducted air
installed

Not long after, lights in bathroom, toilet, second and third bedrooms
would flicker occasionally

I had a fluoro in third bedroom - take it out - all lights OK.
Put it in and the occasional flicker would come back.
All other lights no problems

The air conditioning sparkies who I called back to fix it (assumption -
they disturbed the wiring while crawling around my roof space) found it
interesting about this intermittent flickering, but couldn't find the
problem

I'm getting too old to bugger around in the roof space, but they
weren't going to fix it

So, I, who has an electronics cert (not a sparky ticket in sight) took
my 60 year old body and a multimeter into the roof and found the problem
in about 15 minutes - it ended up being a loose loop connection in the
light in the main bedroom.

I'd follow Franc's advice if I were you, then call the electricians back
after you've found it, and demand they fix it. That way you get a
certificate of compliance. Tell us how long they took

Argusy

I'm not sure about other states but in Western Australia you could
threaten to ring the electrical inspectors if they don't come back to
fix it up. I can't remember off the top of of my head what department
they are but the inspectors carry a big stick and don't hesitate to use
it. "Poor workmanship" is sufficient justification for a largish fine
and a black mark on your (electricians) record.

Friday