Building in Bang Khla

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Re: Building in Bang Khla

Postby Klondyke » Mon Apr 09, 2018 8:12 am

2.5 mm2 is enough...
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Re: Building in Bang Khla

Postby pipoz » Mon Apr 09, 2018 10:51 am

Alan wrote:I'm looking at the Mitsubishi models. There are several. The largest one is 28,000BTUs which they claim runs at just under 12 amps.
I also looked up the specs for the runs to the subpanels and even at 100 amps I think I can get away with #4 AWG or 21.1mm2.



These were Models and Prices I got two years back
MIT MSY-GK13VA 12103.73BTU Super Inverter TB 25,500 per Unit (Supply & Installed) - Used 2 No in the main bedroom which is 46m2
MIT MSY-GK09VA 8656.93 BTU Super Inverter TB 21,500 per Unit x 1No (Supply & Installed), for a 16-18 m2 smaller bedroom

Later bought a 18,000 BTU MIT Super Inverter unit for the living room which is 36m2

Think I have a combination of 10 and 15 Amp Circuit Beakers on the Board

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Re: Building in Bang Khla

Postby Sometimewoodworker » Thu Apr 12, 2018 9:56 am

Alan wrote:Sorry for the confusion. Maybe I’m using the wrong terms for Thailand.

Yes you are :) and you really should be using the standard mm2 rather than trying to match AWG sizes to them

All runs to subpanels are 00 (2/0) AWG which is equal to 9.27mm or 67.4mm2.


First point. You are going to find it extremely difficult to buy and then to terminate a 70mm2 cable without cutting its size down. This is never used in domestic wiring. It will carry a 46kw load with a 15/45 meter 18kw is going to be the maximum you can draw. And even if you have a 30/100 you will only get 33kw

The largest load I have one any leg of a circuit is from water heaters. The largest pulling 2000w.
I=P/V
2000w / 240v = 8.33amps
#10 AWG is equal to 2.59mm or 5.26mm2. This size should be large enough unless I’m calculating wrong.


Probably again yes you are (supply is nominal 220v). A single water heater at 2kw (if you can find one anywhere) will not do much other than be a kettle. If you want to heat running water it will only raise the temperature by a few degrees. Showers start at 3KW for a "hot season only" one. We have just got 6kw units for the cold season.

Also a 2.5 circuit can sustain loads of 20amps

I still have to purchase the oven before I can determine its load.


Not really, if you are going to want a monster, install a dedicated 6mm2 supply otherwise a 4mm2 supply will be OK

If I can get a 30/100 meter I will surely get one. I was told that only a 15/45 meter was available.
.

Always worth asking again, possibly with an office gift.

Alan wrote:I'm looking at the Mitsubishi models. There are several. The largest one is 28,000BTUs which they claim runs at just under 12 amps.
I also looked up the specs for the runs to the subpanels and even at 100 amps I think I can get away with #4 AWG or 21.1mm2.

No you can't because it doesn't exist here the standard sizes are (these maybe difficult to find)


(.5, .75, )1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120 etc all mm2

Unless the sub panels are a very long way away 16mm2 is oversized and 10mm2 adequate

Don't forget that none of your sub panels should ever have the full load

Standard house power is 2.5mm
Shower Water heaters (small), dedicated 2.5mm
Shower Water heaters (big) , dedicated 4mm
Big AC dedicated 4mm (maybe over 40,000 BTU)
Small AC dedicated 2.5mm (your 28,000 BTU is small)
Cookers dedicated 4mm or 6mm
Lighting 1.5mm or sometimes 1mm

All of this is assuming you are using copper, don't even consider aluminium except possibly for the supply to the house from the meter and then only in air as you cannot bury it.
Last edited by Sometimewoodworker on Sun Apr 15, 2018 1:11 pm, edited 1 time in total.
Reason: Added small shower water heater info
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Re: Building in Bang Khla

Postby Klondyke » Thu Apr 12, 2018 7:19 pm

aluminium except possibly for the supply to the house from the meter and then only in air as you cannot bury it.


This is in contrast with my long-life praxis. (not that I would recommend Al when Cu is available).
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Re: Building in Bang Khla

Postby Sometimewoodworker » Fri Apr 13, 2018 5:41 am

Klondyke wrote:
aluminium except possibly for the supply to the house from the meter and then only in air as you cannot bury it.


This is in contrast with my long-life praxis. (not that I would recommend Al when Cu is available).

It is the PEA who will not connect to a house if the feed is in Al and buried. They specifically state if Al it must be in air, if Cu and correctly insulated in air or in ground is OK.

Now it is perfectly possible that if correctly sized and insulated that Al may be buried, I don't know or care about that as it can't be done under Thai PEA regulations.
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Re: Building in Bang Khla

Postby Alan » Sat Apr 14, 2018 8:11 am

Thanks for all the information guys. I will make adjustments were necessary.
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Re: Building in Bang Khla

Postby Alan » Sun Apr 15, 2018 9:34 am

STWW are you saying mm or mm^2?
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Re: Building in Bang Khla

Postby Sometimewoodworker » Sun Apr 15, 2018 1:06 pm

Alan wrote:STWW are you saying mm or mm^2?

Electrical wire sizes worldwide are always given in SQ. MM. often people don't bother with the "SQ" or ”2" as they are understood
IMG_3922.JPG

IMG_3923.JPG


The only county, AFIK, that uses the diameter is the US and then the number is difficult to understand as it is the Brown & Sharpe wire gauge, and is a logarithmic stepped system so any 2 adjacent numbers have a complex relationship with other pairs of numbers . For example the difference in size between 15 and 16 is vastly different than between 5 and 6. Probably to find the difference almost everyone will need a chart.

The rest of the world uses the metric system where the relationship between sizes is immediately apparent and easy 1mm, 2.5mm, and 10mm, 16mm need no brain power to work out the relationships between them
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Re: Building in Bang Khla

Postby Alan » Mon Apr 16, 2018 4:36 am

Got it, thanks
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Re: Building in Bang Khla

Postby Alan » Thu Apr 26, 2018 9:49 am

Windows and Door contractor surveyed today. waiting on quote
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Re: Building in Bang Khla

Postby pipoz » Thu Apr 26, 2018 10:54 am

Alan wrote:Windows and Door contractor surveyed today. waiting on quote


Who did you opt for

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Re: Building in Bang Khla

Postby Alan » Wed May 02, 2018 7:35 am

originally had quote from PVC Phuket but when it was time for the survey they said it would be another 14 weeks before they could come out. they coordinated a transfer with Bangkok Vynal for same systems, quality and price. great service from PVC Phuket and they speak English.
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Re: Building in Bang Khla

Postby Alan » Sat May 12, 2018 8:06 am

Continuing with electric installation. I am told that the biggest meter I can get is 30/100. Some pics of the main and subpanel circuit breaker panels. The kitchen electric panel is on the wrong side of the wall so I'm trying to get this changed.
Attachments
PSA_Electric_Meter.jpg
I believe this says that the largest meter I can get is a 30/100
Main.jpg
Main (from the exterior)
Kitchen.jpg
Kitchen
Garage.jpg
Garage
Bathroom.jpg
Bathroom Box
20180505_WireWay.jpg
Wireway
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Re: Building in Bang Khla

Postby Klondyke » Sat May 12, 2018 8:34 am

Continuing with electric installation. I am told that the biggest meter I can get is 30/100.


My advice: do not worry about the size of the meter. My house is equipped with 15/45A, over incoming cable 2x6mm2 feeding house with 6 pumps, 4 a/c, 3 water heaters. Whilst many of the pumps are running in the same time:

1.1 kW swimming pool (2x4h/day), 0.3 kW pressure pump for house (every while when open a foucet, spraying 3 gardens every day) , 2 pumps ea 0.3 kW feeding my sedimenation system once in 3 -4 days for 5 hours), 0.3kW pump for fish pond every 2 - 3 minutes for ca. 1 min.), 0.3 kW pump re-pumping from rain water storage.

Nobody cares to see whether the pumps running together with the others should be switched off.

And evenings at least 3 a/c running, water heaters for abnahm and for dish washing. Not speaking about 3 large TV, lighting and other consumers.

Never in 12 years we have had any problem.
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Re: Building in Bang Khla

Postby Sometimewoodworker » Sat May 12, 2018 8:58 am

Alan wrote:Continuing with electric installation. I am told that the biggest meter I can get is 30/100. Some pics of the main and subpanel circuit breaker panels. The kitchen electric panel is on the wrong side of the wall so I'm trying to get this changed.

That is correct unless you go to 3 Phase, and the usual 3P 15/45 provides only a little more power.

On a 30/10 you can draw 34,000 Watts all day long without any problems
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