Hi,

The previous house owner has removed the fuse and disconnected the TNB power supply. So I just applied a new meter and it was installed last week. But I noticed that TNB has not install back the fuses. May I know is it under the scope of TNB to do this?

If it's not, then I'll but it from the hardware shop. But is it safe to just push in the 3 fuses where I think the incoming part is live?

Thanks

You need to get it back from the previous house owner, technically the fuse belongs to you...

u need to get the fuses from electrical shop not hardware.
yes the terminals are live so u need to be careful.
normally the fuse goes into a plastic cap then oinly you push in while holding the plastic cap.

I see, thanks for the info. Will do so. Meaning that if I ask TNB to do this, they might charge me for it right?

If I couldn't get it back from the previous owner and need to buy it from the electrical shop, may I know is it OK to just plug it in? I will off the 63A MCB at the switchboard inside my house first.

Thanks

Pretty easy. Wear rubber gloves and shoes. Push fuses into the connector blocks.

Be sure to turn off the breaker first. Otherwise might have sparks.

Ya I saw it at my neighbour's meter, it's with a handle so I think it's quite safe to do so. Just wanna make sure before I plug it in

Better ask electrician to do.
Do you even know how many amps fuse to buy?
The fuse holder not all compatible
Remember to off all your loads before doing

Noted thanks for the info

Noted with thanks but will try to get the info from TNB

How do you know that it is the previous owner that remove the fuse n not tnb?
As I know, everything in the bos is tnb's responsibility including the fuse

I'm not sure but I remember that when I first went to view the house, the meter was still there but not the fuses, and the agent inform me that the owner has removed it since no one is staying there. But could be also stolen or taken by TNB as you have mentioned.

last time mine blown, TNB replace it... also house that kena potong, they will remove the fuse too.

this is from my observation la.. not sure it's their SOP or not.

the fuse belong to TNB. so TNB take it out after previous owner unregistered with TNB and take back their deposit. So TNB should put it back after you register new acc for that house. standard SOP for sub sale house.

OK noted with thanks.

Managed to have TNB come to install the fuses. But I noticed that it's rated at 32A which is kinda low as the MCB at the DB is already 63A. Meaning that the fuse will burn first before the MCB will trip.

May I know is this normal? Or I shall ask TNB to change it to 63A or 100A fuse?

Thanks

Yes. Have them change it to 63

Contacted TNB, too bad they insist that 32A is OK and ask me to inform them again shall there be any problems in the future

BTW, just wondering if it's OK to buy the 63A or 100A fuse from the electrical shop and change it by myself? Will TNB later say I temper with their meter?

Thanks

then check, is your breaker wrongly sized?
it should be smaller than the fuse

Nope breaker should be correct as it's the original one from the new house. 63A for the incoming, 40A for the ground floor DB and 40A for the 1st floor DB.

Should I be concern about the 32A fuse?

This post has been edited by lowyat101: Mar 6 2019, 01:04 PM

Erm... usually different cut out fuse have different size housing. So have to buy the housing together. Which will cost around rm100 for 3 phases if it is a 3 phase system. If 1 phase then around rm30-40. There are a few different type housing and if they don’t fit properly with the original then it will have problem.

Tnb won’t accuse of you tempering the meter. The fuse have no serial number attached anyway... unless there are wires with clamp on the fuse which they may record down. Anyway, if you don’t know what you are doing, don’t do it. High current and voltage. If you try to pull it out or install without breaking the house electricity in the first place, there and be big arcs and potential damage to equipment in the house due to the voltage spikes and dips.

what is the cable size? can the cable, fuseholder, meter handle 63A or 100A? if can, then can ask tnb for 100A instead.
the breakers and fuse is sized to protect cable and provide discrimination.

since we are on this page, kindly insist on
RCD - 100mA for light, 30mA for socket, 10mA for bathroom
add on SPD if there is risk of lightning
check your earthing

these will help to avoid unnecessary problems later.

OK noted with thanks

Thanks for the info. About the incoming cable size, I can't see any marking last night as it was dark outside. But inside the DB, at the 63A MCB, it's 16mm.sq, and 10mm.sq for the 40A MCB. Is it good enough?

Ya I do see the 100mA, 30mA and 10mA RCDs inside the DBs. But haven't trace them to which MCB yet. I guess they should have followed the ST requirements on the home wiring. Will do a check later to see if they follow 100%.

BTW, is it suppose to be, 20A MCB for the aircond/water heater, and 32A MCB for the SSO?

There are also 4 SPDs (for each phase and neutral, In 20kA, Up <2.0kV) next to the incoming MCB, which I think is good enough for lightning protection?

Thanks

BTW, when I tested all the RCDs last night, 1 of the 20A, 10mA RCD will not trip upon pressing the test button. Does it means that the RCD is faulty?

should be ok. i read from ur post, u said 3 fuses. meaning 3 phase. 32A per phase is good enough.

if its not tripping and still have power, yes its faulty.

Sorry.. dint see it's 3 phase.. then you have plenty enough power.

No need to change anything. Cable sizing is right for the inside db

Ya change the rosak RCD. Always use branded like Hager abb schneider.

32a breaker for socket is a bit unusual. Check the cable size of the outgoing. Most likely contractor use ring circuit. Problem will come is the ring is broken. I prefer star circuit and use smaller mcb

Check for a breaker BEFORE the SPD. Make sure have breaker or fuse. Else may burn down the house.

Ya ya sorry forgot to mention it's 3-phase

But still if there's any overload, the 32A fuse will still blow first before the main 63A MCB will trip right? Then I might need to get a spare fuse since TNB is not keen to change it to higher rating.

Abut the RCD, the current brand is EPS. Is it a good brand? Or better to use the brands as mentioned above?

About the breaker before the SPD, I noticed that there's 1 in between the main 63A MCB and the SPDs, with metal lever (the main 63A MCB is with plastic lever). I believe it's the one you mentioned right?

Thanks again

I thiNk it fine. That's why right sized mcb is more important.

MCB can cap ayam. RCD better branded.
MCB fail = fire still can run. RCD fail u touch die immediately

SPD.. dunno. Better take a picture.

IMO you are too anal about this 32A issue. Just leave it alone it will be fine. It's not like you are running some serious mining rig at your house. Ignore all the advice as you may be endangering yourself and your family by being too busybody. Unless you have are a qualified chargeman stick to the TNB recommendation.

ts concern is right. having a undersize fuse means wrong coordination.
however, i doubt ts will have trouble unless he turn house into mining factory or freezer house.

ur main 63A MCB at DB is fuse type or MCB type?
if mcb type, u can put 3 phase 32A fuse after the main 63A mcb for peace of mind.

btw, about the 32A meter fuse, u shouldnt worry about.. if any problem with cable from the meter to ur DB, the fuse will easily blow/protect. 63A for 1 phase is quite high and the main cable will burn before reaching high 63A current.

This post has been edited by Max: Mar 7 2019, 08:04 AM

You might be right but I just wanna understand the logic behind it as from my experience, the downstream protection should be activated first before the upstream one. Also it's much easier to reset the MCB instead of changing the fuse when the need arises.



Ya ya only a few units of aircond and water heater, and a centralised pump. Others are standard home appliances like oven etc., nothing more than that.



Noted the suggestion but for the time being, I can leave the 32A fuse there and keep a 63A fuse as spare in case needed, so no need to wait for TNB to come and change it. The incoming cable is 16 mm.sq, which I think is good enough for 63A. But then there's no way I'll be using 63A per phase, just wanna understand the logic behind it

This post has been edited by lowyat101: Mar 7 2019, 09:18 AM

My logic think, if the cable from meter to ur db problem, 32A easily protect/blow to prevent more damage.

Btw that 63A mcb i think more likely as a main cut off rather than protection device. No?

So few days ago my cut off fuse were stolen too..3 phase wiring, bought em off at electric ahop for 35each , 63amp..just wondering ..when one cabut your fuse..will it do damage on the electrical appliances ?
And how do we prevent this kind of things from happening again?
Its so easy to pull out the fuse..it doesn't have any kind of safety locking system when pushed in.. sometimes unsure if the fuse is in or not

It won't damage yourelectrical appliances.

The fuses design not for thieft prevention. They (mnufacturing) don't no that Malaysia is that bad.

You can install a metal box with a door which can lock.

If the door of your meter chamber comes with a latch, then can lock it using a padlock. Else need to ask your grill contractor to make one for the meter chamber door and lock it accordingly. But make sure it's still visible for the TNB staff to read the meter.

Else just keep a set of spare fuse

Cut-out fuse is when the external cable connection to the internal cables.

All under responsibility of TNB

if no have can?

This is one of the requirement of getting supply from TNB, it has to be fused because without it, any short circuit happen - can be because of animal biting the wire and the mouth is likely wet with saliva, you are looking at the entire area's current which can be tens of thousands of amps going thru your home wiring which is guaranteed to boom or catch fire.

Further protection of internal circuits is the function of the DB box by way of RCD/RCCB/MCB (but that is internal circuit) and under ST guidelines' law.

This post has been edited by ceo684: Nov 4 2020, 09:36 PM