Low voltage single phase - whole house stabilizer or get 3 phase and split?

[bankruatsteve]

Except for use of breaker as an isolator in front of the stabilizer I'm not getting where the CU main breaker even matters.

It doesn't any more

But it's cheaper to leave it in than to replace with an isolator.

The breaker in front of the stabiliser is what is now protecting the supply.

Not trying to be stubborn on this - just want to understand... Shouldn't the stabilizer be sized with the mains cable rating in mind? If so, why would a breaker be needed prior? (other than as an isolator)

[Crossy]

Except for use of breaker as an isolator in front of the stabilizer I'm not getting where the CU main breaker even matters.

It doesn't any more

But it's cheaper to leave it in than to replace with an isolator.

The breaker in front of the stabiliser is what is now protecting the supply.

Not trying to be stubborn on this - just want to understand... Shouldn't the stabilizer be sized with the mains cable rating in mind? If so, why would a breaker be needed prior? (other than as an isolator)

To protect the meter (the supply). Since the stab could potentially draw significantly more current than it's outputting (with a very low supply voltage) you need over current protection on the incoming supply.

The stab could be 100 times the rating of the incoming supply, provided it never draws more then the supply is rated for there would be no issue.

[bankruatsteve]

OK. That makes sense. As usual Crossy, you 'splained it.

Edited June 2, 2016 by bankruatsteve

[carlyai]

Except for use of breaker as an isolator in front of the stabilizer I'm not getting where the CU main breaker even matters.

It doesn't any more

But it's cheaper to leave it in than to replace with an isolator.

The breaker in front of the stabiliser is what is now protecting the supply.

Not trying to be stubborn on this - just want to understand... Shouldn't the stabilizer be sized with the mains cable rating in mind? If so, why would a breaker be needed prior? (other than as an isolator)

To protect the meter (the supply). Since the stab could potentially draw significantly more current than it's outputting (with a very low supply voltage) you need over current protection on the incoming supply.

The stab could be 100 times the rating of the incoming supply, provided it never draws more then the supply is rated for there would be no issue.

[Crossy]

Carl, go to your PC

[carlyai]

One of my family has some very large sound systems.

We were on beach road pattaya where he was playing at a wedding (before the high rises were built onto beach road).

His sound system was drawing so much current that the incomming mains supply wires started smoking, but nothing tripped on the supply side. He had to close down some amps.

Also the isaan 'welders' don't keep an arc, they stop and start, stop and start. This is bad welding practice when i went to trade school, but seems they do it so the overhead wires don't catch fire.

I could be corrected on this.

[carlyai]

Im getting a root canal. Tomorrow. Sorry.

[Naam]

@Naam

If you are on a 15/45 your 100A breaker wouldn't think of opening before 120A possibly more, meters are robust, but that's really taking the Michael.

A 63A incomer is the biggest I would be happy putting on a 15/45.

If it's really an issue then upgrade to a 30/100 meter which will be more than happy on a 100A MCB.

does it make a difference that my supply is 3 x 15/45?

and if 63A incomer is the biggest you would be happy putting whay is the highest you'd put for being a wee bit less happy?

Edited June 2, 2016 by Naam

[Crossy]

@Naam

If you are on a 15/45 your 100A breaker wouldn't think of opening before 120A possibly more, meters are robust, but that's really taking the Michael.

A 63A incomer is the biggest I would be happy putting on a 15/45.

If it's really an issue then upgrade to a 30/100 meter which will be more than happy on a 100A MCB.

does it make a difference that my supply is 3 x 15/45?

No!

[Naam]

@Naam

If you are on a 15/45 your 100A breaker wouldn't think of opening before 120A possibly more, meters are robust, but that's really taking the Michael.

A 63A incomer is the biggest I would be happy putting on a 15/45.

If it's really an issue then upgrade to a 30/100 meter which will be more than happy on a 100A MCB.

does it make a difference that my supply is 3 x 15/45?

No!

please give me a solution Crossy. is it very difficult to get a 3x30A meter and does this mean 3x30/90?

[Crossy]

@Naam

If you are on a 15/45 your 100A breaker wouldn't think of opening before 120A possibly more, meters are robust, but that's really taking the Michael.

A 63A incomer is the biggest I would be happy putting on a 15/45.

If it's really an issue then upgrade to a 30/100 meter which will be more than happy on a 100A MCB.

does it make a difference that my supply is 3 x 15/45?

No!

please give me a solution Crossy. is it very difficult to get a 3x30A meter and does this mean 3x30/90?

It would be a 3 x 30/100 meter.

How close to the limit are you on your 3 x 15/45 if the supply is at the nominal 220V?

What value is your main incoming breaker?

You'll need to talk to your local PEA office (if you have a PEA supply) about getting a 3 x 30/100, it shouldn't be an issue in your location. They may want to see > 25mm² going from the meter to your home before they will upgrade the meter.

[Naam]

It would be a 3 x 30/100 meter.

How close to the limit are you on your 3 x 15/45 if the supply is at the nominal 220V?

What value is your main incoming breaker?

You'll need to talk to your local PEA office (if you have a PEA supply) about getting a 3 x 30/100, it shouldn't be an issue in your location. They may want to see > 25mm² going from the meter to your home before they will upgrade the meter.

it's not really a matter of being close. i want to solve another problem. you might remember my protection device that shuts off a phase completely when the voltage drops to 195V or lower to protect starting relays of aircons and pumps.

i have back-up systems for all essentials such as house water supply, PCs, TVs, microwave but not for aircons. a stabilizer for each phase would solve that problem. no problem to show them my present ~75mm² (copper Ø10mm).

the primary supply to my meter is ~Ø18mm but from there only Ø8mm to the meter (length 50cm). i assume that the subcontractor used a bigger diameter to compensate for the distance meter to house which is approximately 15m.

p.s. when i first saw the wiring i cursed the electrician because i thought it was the other way round.

[Crossy]

No worries about the incoming supply then Naam

I would install 3 x 25kVA single-phase stabiliser units first, they would be big enough to handle a 100A incoming breaker if it turned out to be necessary.

Then if the current incoming breaker (63A?) opened on a semi-regular basis upgrade to a 30/100 meter with a 100A incomer.

[Naam]

No worries about the incoming supply then Naam

I would install 3 x 25kVA single-phase stabiliser units first, they would be big enough to handle a 100A incoming breaker if it turned out to be necessary.

Then if the current incoming breaker (63A?) opened on a semi-regular basis upgrade to a 30/100 meter with a 100A incomer.

my layman grey cells are confused from reading mm²/amp/distance loss tables Crossy. what i am worried about is that my (own) cable ~75mm², distance from meter to distribution 22m loses 75% of potential amp carrying capacity. that according to some table i found in the net but it sounds like bullsh** to me.

please comment.

[Crossy]

Got a link to where the table came from Naam?? Need the context to comment further.

The Doncaster cables calculator http://www.doncastercables.com/technical/cable_calculator suggests that 50mm² would be fine (5% volt drop @ 100A)

[Naam]

Got a link to where the table came from Naam?? Need the context to comment further.

The Doncaster cables calculator http://www.doncastercables.com/technical/cable_calculator suggests that 50mm² would be fine (5% volt drop @ 100A)

i just got the image when i googled Crossy. can't find the actual link again.

[Naam]

Got a link to where the table came from Naam?? Need the context to comment further.

The Doncaster cables calculator http://www.doncastercables.com/technical/cable_calculator suggests that 50mm² would be fine (5% volt drop @ 100A)

i just got the image when i googled Crossy. can't find the actual link again.

talked a couple of minutes ago to a "Crossy" in Germany who confirmed that your doncaster link is correct. forum rules prohibit that i mention his comments referring to the table i posted

[Naam]

No worries about the incoming supply then Naam

I would install 3 x 25kVA single-phase stabiliser units first, they would be big enough to handle a 100A incoming breaker if it turned out to be necessary.

Then if the current incoming breaker (63A?) opened on a semi-regular basis upgrade to a 30/100 meter with a 100A incomer.

thanks to Crossy, IMHO and others!

i have more or less decided to buy locally three COMSON 20 kVA because Global House can't deliver the Viet Nam product and i'm not willing to jump customs hurdles by importing myself. total cost including delivery charges THB 81,000

will report progress.

[carlyai]

No worries about the incoming supply then Naam

I would install 3 x 25kVA single-phase stabiliser units first, they would be big enough to handle a 100A incoming breaker if it turned out to be necessary.

Then if the current incoming breaker (63A?) opened on a semi-regular basis upgrade to a 30/100 meter with a 100A incomer.

thanks to Crossy, IMHO and others!

i have more or less decided to buy locally three COMSON 20 kVA because Global House can't deliver the Viet Nam product and i'm not willing to jump customs hurdles by importing myself. total cost including delivery charges THB 81,000

will report progress.

[carlyai]

Hi Naam,

Have you tried Muan Thai Outlet?

The branch I saw some of those Viet. stabalisers at was Roiet.

When I bought my 3 10kva I bought 2 outside Pattaya and then Global House searched their data base and found one more in one of their country stores.

If you want the Lioa brand then Global will search their data base, or Muan Thai or Bankok outlet, have all sorts of stabalisers for their dound systems. Big gen sets, everything for those kilowat sound systems.

The boss guy at Muang Thai Outlet in Roiet is very well educated and both his wife and he speak good english. Nice shop, good people.9

[Naam]

If you want the Lioa brand then Global will search their data base...

thanks Carlyai but i was told in Chonburi that several other customers were interested to buy but couldn't be served.

[Naam]

Have you tried Muan Thai Outlet?

??????

[carlyai]

Have you tried Muan Thai Outlet?

??????

[carlyai]

Hi naam

google: muang thai outlet.

They are on facebook.

The branch I go to is in Roiet.

Speak to the boss who is Thai but great English.

If you tell him about the stabalisers you want he will let you know if he has them or not.

Last time I was there (couple of months ago)he had lots of stabalisers.

Some Thai type but also the servo type.?

[Naam]

google: muang thai outlet.

They are on facebook.

i don't have a facebook account and can't get any other info from google. but thanks anyway.

do you have a phone number?

[carlyai]

google: muang thai outlet.

They are on facebook.

i don't have a facebook account and can't get any other info from google. but thanks anyway.

do you have a phone number?

[carlyai]

I gotta spoon feed you Naam.

Try this one mate.

043528337.

Wait until they open, maybe 0800 hr.

Need to speak to boss or wife as they are the only ones with English.

?

[Naam]

I gotta spoon feed you Naam.

Try this one mate.

043528337.

Wait until they open, maybe 0800 hr.

Need to speak to boss or wife as they are the only ones with English.

?

big thanks Carlyai! the Thai of my Thai assistant isn't too bad perhaps he has even a facebook account.

[Crossy]

Carl, I've hidden several of your posts with quotes only, are you still struggling with your phone?

[carlyai]

Yes I am.

I haven't had a chance to investigate yet, as I initially thought it was my fault.

Could still be my fault, and need to do some testing with thaivisa guru.

Phone seems to reload the page sometimes, like I press quote, go to type and the page reloads, so I start again.

Maybe I carelessly touch the send button with my big finger.

I thought I would try and help Naam out as was waiting at the airport.

To stop giving you headaches, I will curb the urge to post until I sort the problem out.

Sorry for the trouble.