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weikee
post Feb 28 2012, 02:11 PM

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Depend the length use, and if is conceal in the pipe? 16mm2 should be able handle 50Amps if length is not too long.
tomjason
post Feb 28 2012, 02:22 PM

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QUOTE(JinXXX @ Feb 28 2012, 01:21 PM)
i think the unsafe refers to connecting wrongly rather than changing the box lol smile.gif


Added on February 28, 2012, 1:21 pm

16mm cable is how many AMP cable ?
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i requested 16 mm cable for my 3 phase.... i suppose 63 Amps each.

This post has been edited by tomjason: Feb 28 2012, 02:22 PM
weikee
post Feb 28 2012, 02:34 PM

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QUOTE(tomjason @ Feb 28 2012, 02:22 PM)
i requested 16 mm cable for my 3 phase.... i suppose 63 Amps each.
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Yes, also depend on condition too. You need to know the material it use, difference material give difference current ratting. If use for outdoor the black color cable that one can handle more current if install expose. That is why you see TNB cables are expose for better cooling.

There is a cabling standard we follow (UK Standard), and I read that in MPH before. Can't find it now.
ozak
post Feb 28 2012, 03:46 PM

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QUOTE(tomjason @ Feb 28 2012, 02:22 PM)
i requested 16 mm cable for my 3 phase.... i suppose 63 Amps each.
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16mm can handle 61A. Too big, you have voltage drop and use more current.
tomjason
post Feb 28 2012, 03:57 PM

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QUOTE(ozak @ Feb 28 2012, 03:46 PM)
16mm can handle 61A. Too big, you have voltage drop and use more current.
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my cable if not mistake brand 'mega' Sirim approved...yes black cable...very heavy....1 feet about RM8 if i were to recall..With this design, i notice more stable (less trip when lightning especially) and i notice also save on my electricity instead.

This post has been edited by tomjason: Feb 28 2012, 03:58 PM
weikee
post Feb 28 2012, 04:01 PM

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Is always better to use thicker wires, less voltage drop.
Eng_Tat
post Feb 28 2012, 04:08 PM

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sharing this website from uk, to calculate voltage drop and recomendation to used which gauge of wires

http://www.tlc-direct.co.uk/Technical/Char...oltageDrop.html

ozak
post Feb 28 2012, 05:15 PM

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QUOTE(tomjason @ Feb 28 2012, 03:57 PM)
my cable if not mistake brand 'mega' Sirim approved...yes black cable...very heavy....1 feet about RM8 if i were to recall..With this design, i notice more stable (less trip when lightning especially) and i notice also save on my electricity instead.
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i m planing to use 16mm or 10mm cable to branch like your way too. And a db box for kitchen, upstair and the hall. But is a single phase. It save electrical in this way according to my survey.
JinXXX
post Feb 28 2012, 05:26 PM

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QUOTE(ozak @ Feb 28 2012, 05:15 PM)
It save electrical in this way according to my survey.
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huh ? install multiple db can save electric ? rclxub.gif
ozak
post Feb 28 2012, 05:44 PM

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QUOTE(JinXXX @ Feb 28 2012, 05:26 PM)
huh ? install multiple db can save electric ?  rclxub.gif
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It is not the db box. It is the wire thickness and long distance cause.
pky
post Feb 28 2012, 06:21 PM

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The box is called a DB(Distribution Board).

The problem you will most likely face and give up during DIY change DB is when want to arrange and squeeze all the wires into the DB.

16mmsq Cu. PVC Cable in enclosed conduit/trunking can carry current of 70amp, which i consider, too insecure for 60A MCB, but guess your house load won't max untill 60A.

TNB cable laid exposed is for easy troubleshooting and to detect in case the cables are tempered with. It is correct to say the cable can carry higher amp when exposed too.

Cable size are determined based on IEE Wiring Regulations.

When choosing cable, go for those reputable with SIRIM approval. Others, too much impurities in the copper, or insulation is too thin. Mega Cable is a good one.

Black colour cable doesn't indicate it can carry more current. Look at the label, the most basic is Cu. PVC, then Cu. PVC/PVC, then Cu. XLPE/PVC, and the list goes on. The better insulation, the higher their rated carry amp.

Cable voltage drop in normal house hold are too minimal to be noticed. A 16mmsq Cu PVC Cable volt drop is 2.39 V/A/km.
weikee
post Feb 28 2012, 06:49 PM

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The tnb cable use are better quality, and usually come in black. If that is the type it use it can carry higher current.
vetkin_gray
post Feb 28 2012, 06:49 PM

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Your switch board is so big.. Alang-alang change new one, move the darn thing outside the house.
weikee
post Feb 28 2012, 06:53 PM

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Btw, anyone here try trip the main switch from the db and see if your meter still running. Mine will still turn buy very slow. If take out the main fuse beside the meter it will stop turning.


Added on February 28, 2012, 6:56 pm
QUOTE(vetkin_gray @ Feb 28 2012, 06:49 PM)
Your switch board is so big.. Alang-alang change new one, move the darn thing outside the house.
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If you move the db box outside the house anyone can climb in and tap your power or maybe trip it for you when you sleeping

This post has been edited by weikee: Feb 28 2012, 06:56 PM
vetkin_gray
post Feb 28 2012, 08:43 PM

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QUOTE(weikee @ Feb 28 2012, 06:53 PM)
Btw, anyone here try trip the main switch from the db and see if your meter still running. Mine will still turn buy very slow. If take out the main fuse beside the meter it will stop turning.


Added on February 28, 2012, 6:56 pm

If you move the db box outside the house anyone can climb in and tap your power or maybe trip it for you when you sleeping
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sweat.gif prank the neighbour sweat.gif

This post has been edited by vetkin_gray: Feb 28 2012, 08:51 PM
pky
post Feb 28 2012, 09:50 PM

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QUOTE(weikee @ Feb 28 2012, 06:49 PM)
The tnb cable use are better quality, and usually come in black. If that is the type it use it can carry higher current.
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which tnb cable u referring to? those run along the top of your house's main door or those on the poles?
Those run on top of your main door are done by developer, those run on poles, most probably aluminium cable. Cables mostly manufacture in black for the ease of use. You don't expect cable manufacturer to produce red, yellow, blue, black, green, it will be headache to the manufacturer and the user. Black doesn't mean quality, a common fire rated cable have higher carrying amp compare to a normal pvc cable fo the same size, and FR cable are in Orange.

DB usually located in rooms or at corners to maintain aesthetic while not leaving out the ease of accessibility.
weikee
post Feb 28 2012, 09:58 PM

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QUOTE(pky @ Feb 28 2012, 09:50 PM)
which tnb cable u referring to? those run along the top of your house's main door or those on the poles?
Those run on top of your main door are done by developer, those run on poles, most probably aluminium cable. Cables mostly manufacture in black for the ease of use. You don't expect cable manufacturer to produce red, yellow, blue, black, green, it will be headache to the manufacturer and the user. Black doesn't mean quality, a common fire rated cable have higher carrying amp compare to a normal pvc cable fo the same size, and FR cable are in Orange.

DB usually located in rooms or at corners to maintain aesthetic while not leaving out the ease of accessibility.
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Black I know does not mean quality, but the usual running along the house are better. When i say the black, is that cable i meant. I did not say all black cable are better quality.
JinXXX
post Feb 28 2012, 10:38 PM

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QUOTE(weikee @ Feb 28 2012, 09:58 PM)
Black I know does not mean quality, but the usual running along the house are better. When i say the black, is that cable  i meant. I did not say all black cable are better quality.
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just look at the laser engrave marking on the cable for the what ever standard they follow la..

that is the only sure way to confirm..

if black cable == good, then i paint it black == means good ? rclxm9.gif rclxms.gif lol hahah
Eng_Tat
post Mar 1 2012, 12:00 PM

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side track abit, Any one know is Mega Kabel brand is ok? 4mm/100m is rm120+-. and i didnt know 16mm is so expensive rm6 per mtr
also is the price correct for 1pastic db consist of 1mcb/24 fuse from maxguard or eps brand is around rm200 for the whole set.
mkow
post Mar 2 2012, 11:13 PM

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QUOTE(Eng_Tat @ Mar 1 2012, 12:00 PM)
side track abit, Any one know is Mega Kabel brand is ok? 4mm/100m is rm120+-. and i didnt know 16mm is so expensive rm6 per mtr
also is the price correct for 1pastic db consist of 1mcb/24 fuse from maxguard or eps brand is around rm200 for the whole set.
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Mega, Universal, Central Cables, and a few more are all TNB, JKR certified. Nowadays, Mega is most popular with projects, Universal only TNB, remember Sarawak Mat Taib, he is linked to this company there. They only recommend Universal Cable for the projects there...haha..you know what I mean...

these companies are 100% copper(very important for big cables - 10mm upwards). Normally only big factories like these can afford to come out with such cables. A lot of smaller factories produces undersize cables, to "cheat" the users, mainly bought by the contractors. Where do you ask the 4mm, @120+ is cheap, and it's Mega Kabel too!

the plastic db is 1level or multiple levels? maxguard/eps good enough for not so many MCBs. if you want better, go for ABB or Hager. cost a lot more, and also the metal db box from Hager is very canggih

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