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TSKuzumiTaiga
post Aug 31 2019, 02:31 AM, updated 5 months ago

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Hi, would like to seek for opinion from any electrician with experience here.

I am in the midst of arranging to renovate my house (three phase wiring terrace if it matters)

living room has 4 lighting points total, one switch = two points. total 2 light switches.

I engaged with a general contractor, I wanted to make total 8 lighting points for 8 surface lights instead of the original 4. Means 1 switch = 4 points. He said cannot for this type of LED light because will cause tripping, but the lighting shop people tell me it doesn't matter how many lights I put since they're all LEDs they don't draw much power anyway. He said must create new lighting switch from the distribution box.

1 LED surface light = 36W

Can anyone please advice me if contractor is right or lighting shop ah? icon_question.gif thanks!

On the box:

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This post has been edited by KuzumiTaiga: Aug 31 2019, 02:32 AM
pretty23
post Aug 31 2019, 08:31 AM

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QUOTE
I wanted to make total 8 lighting points for 8 surface lights instead of the original 4. Means 1 switch = 4 points.


So you mean total 2 switches, when you switch on 1 switch then 4 lights will on ?
cintamani83
post Aug 31 2019, 09:47 AM

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it all depends on your fuse box? u take picture of your light useless.
TSKuzumiTaiga
post Aug 31 2019, 10:50 AM

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QUOTE(pretty23 @ Aug 31 2019, 08:31 AM)
So you mean total 2 switches, when you switch on 1 switch then 4 lights will on ?
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Yup boss
QUOTE(cintamani83 @ Aug 31 2019, 09:47 AM)
it all depends on your fuse box? u take picture of your light useless.
*
HI, checked the db, it says 10A, wires look thick too. In your opinion do you think this is fine? Thank you so much for your input
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pretty23
post Aug 31 2019, 10:56 AM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 10:50 AM)
Yup boss
HI, checked the db, it says 10A, wires look thick too. In your opinion do you think this is fine? Thank you so much for your input
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You want single 10A MCB to connect 8 units LED light each unit 35w?
TSKuzumiTaiga
post Aug 31 2019, 12:03 PM

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QUOTE(pretty23 @ Aug 31 2019, 10:56 AM)
You want single 10A MCB to connect 8 units LED light each unit 35w?
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And apparently 2 fans also. Overload?

If 6 lights + 2 fans?
howszat
post Aug 31 2019, 12:13 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 12:03 PM)
And apparently 2 fans also. Overload?

If 6 lights + 2 fans?
*

Shop people are right.

LEDs, fans all low wattage, would not cause trip.

Something like this contractor also don't know, better change contractor.

pretty23
post Aug 31 2019, 12:20 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 12:03 PM)
And apparently 2 fans also. Overload?

If 6 lights + 2 fans?
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10A x 240V = 2400W

80% 2400W = 1920W

36 x 8 = 288W + 2 fans still below the 1920W.

Should not be a problem.
harumanis_man
post Aug 31 2019, 03:13 PM

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QUOTE(howszat @ Aug 31 2019, 12:13 PM)
Shop people are right.

LEDs, fans all low wattage, would not cause trip.

Something like this contractor also don't know, better change contractor.
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Sometime contractor use excuses not to do something

Due to hassle or cost them more
TSKuzumiTaiga
post Aug 31 2019, 04:46 PM

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QUOTE(howszat @ Aug 31 2019, 12:13 PM)
Shop people are right.

LEDs, fans all low wattage, would not cause trip.

Something like this contractor also don't know, better change contractor.
*
QUOTE(pretty23 @ Aug 31 2019, 12:20 PM)
10A x 240V = 2400W

80% 2400W = 1920W

36 x 8 = 288W + 2 fans still below the 1920W.

Should not be a problem.
*
Thank you very much for your feedback! I appreciate it very much. Is there a certain type of wire thickness that I need to insist for the contractor to use?
pretty23
post Aug 31 2019, 04:54 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 04:46 PM)
Thank you very much for your feedback! I appreciate it very much. Is there a certain type of wire thickness that I need to insist for the contractor to use?
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QUOTE
Conductor Size Current Maximum power (Watts)
1.0 mm2 10 amps Up to 2400 Watts
1.25 mm2 13 amps Up to 3120 Watts
1.5 mm2 15 amps Up to 3600 Watts
2.5 mm2 20 amps Up to 4800 Watts

TSKuzumiTaiga
post Aug 31 2019, 04:58 PM

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QUOTE(pretty23 @ Aug 31 2019, 04:54 PM)

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I see, going by this chart I guess I don't need to insist any type of wiring thickness then, thank you!
tadaima
post Aug 31 2019, 05:00 PM

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I don't know about electrical thingy but when I do additional wiring for my new house, I insist on using better quality wires i.e thicker insulation because there are many low quality made in china kind of wiring in the market and it can be unsafe in the long run. Just a word of caution.


pretty23
post Aug 31 2019, 05:00 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 04:58 PM)
I see, going by this chart I guess I don't need to insist any type of wiring thickness then, thank you!
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Pure copper is first choice.
pretty23
post Aug 31 2019, 05:03 PM

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QUOTE(tadaima @ Aug 31 2019, 05:00 PM)
I don't know about electrical thingy but when I do additional wiring for my new house, I insist on using better quality wires i.e thicker insulation because there are many low quality made in china kind of wiring in the market and it can be unsafe in the long run. Just a word of caution.
*
Buy from local brand like jaya, fajar, southern etc.
azbro
post Sep 2 2019, 06:57 AM

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My house using 8 downlights

1 switch control 4.

From my experience with it more than 15 years

If you put those every saving bulbs, can blow out 1 bulb causing a few to blow as well. But using Led, never had this problem, but Led also will flicker when end of life, but it doesn't effect the other bulbs.

If you calculated the rating is OK, make sure the wires they use follow the required specs. Most of the time before install they say put thick2 wires but end up they use lousy 3 core wires. Actually, 3 core wires only acceptable for temporary like extention plug. Those house ones need to use single2 cables with the required AWG for the job.

This post has been edited by azbro: Sep 2 2019, 06:59 AM
cintamani83
post Sep 2 2019, 02:05 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 10:50 AM)
Yup boss
HI, checked the db, it says 10A, wires look thick too. In your opinion do you think this is fine? Thank you so much for your input
user posted image
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your electrician didnt bluff u. it will not work with so many led lights
kohchuup
post Sep 3 2019, 03:59 PM

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QUOTE(KuzumiTaiga @ Aug 31 2019, 04:58 PM)
I see, going by this chart I guess I don't need to insist any type of wiring thickness then, thank you!
*
for low wattage yes, but for higher wattage like electric kettle, heater n etc.... u'll need thicker cables.
pattleongkam
post Sep 4 2019, 09:23 PM

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QUOTE(cintamani83 @ Sep 2 2019, 02:05 PM)
your electrician didnt bluff u. it will not work with so many led lights
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your reason??

as per preaty23 pointed out with calculations,
I myself as a 20years of electrical/electronic background agreed with preaty23!!!

as for ts, 2 option
1. insist on the installation as requested and nego with the electrician with some compensations

2. chg wireman!!! thumbsup.gif
ihm11
post Sep 4 2019, 11:20 PM

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one unit 36W oni draw 0.15A

standard light point/socket is fitted with 15A breaker

it'll take 100 lights to trip the breaker

put 8 oni sap2 water

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