I'm not a contractor.. I'm an end user.. I work with competent electrical wireman/contractors..

I wish you to use the prevailing market rates and compare them to the actual service rates that are being carried out..

I wish you refer the the accepted quality approval bodies and the relevant codes for material rather than make general statements on sub par quality wire..

You mention sub par quality.. base on what standards? material/process/quality ? what is it?

You speak like a fool..

I think you better consult another electrician..

No competent will install a 100A HRC fuse in a residence. ST (Suruhanjaya Tenaga) whom regulates Tenaga Nasional and all electrical energy producers (EPP's) guidelines only recommend a 40/60A fuse for residential..

The function of a HRC (high rupture cartridge) fuse is to protect the wirings against maximum demand..

If your maximum demand is exceeded as what you have proofed then you are only recommended to max 60A single phase.. More than that 60A maximum demand you will need to pull in another phase and balance up the load ..

You run the risk of overloading your wiring and your protection devices..

Please remove that 100A and put in a 60A HRC..

The 100A cannot protect maximum demand and will start to burn cables if you so exceed it again.. You are seriously talking fire hazard now..

Go here and find the section for residential wiring guidelines .. http://www.st.gov.my/

What?

You're right..

A HRC fuse protects the immediate wiring subcircuit..

Based on this logic..

100A single phase requires wire size to be 2x25mm2 copper cable or bigger for Live & Neutral .. means from 100A HRC fuse to TNB Kwh meter to 100A Distribution Board (DB)..

So this means your inside your DB must have a 100A Double pole (DP) to 100A RCD (to outgoing SP mcb Live busbar and to Neutral Bar) all still using 25mm2 wire ..

The only problem to this is the normal wire size that can fit inside a residential DB is only 10mm2.. which is only rated to 40A

If you know what your wireman is doing and he is indeed replacing the wire it is all good..

I am saying it is very hard and almost impossible to fit a 25mm2 pvc copper wire within a residential DB and I think your wireman is taking you for a fool..

Another thing is the combined (maximum demand) load which can trip a 40A mcb will not blow a 100A HRC fuse..

What usually happens if a fault happens is a high fault inrush current(usually from AC motors) will melt fuse the 40A mcb contacts making it unable to trip heat up the 10mm2 copper cable and start to burn ..

This fault current will not trip a 100A HRC fuse (which is a slow thermal response high rupturing capacity type and not a magnetic type tripping device)..

A fuse blows open and mcb (miniature circuit breaker) magnetically trips (and a bimetallic thermal trip but the primary trip function is magnetic)..

The decision is yours to make but if you do it wrong it is a safety issue ..

Edit * If you refer to the Suruhanjaya Tenaga tables for current carrying capacity the minimum cable size for 100A (enclosed in conduit) is 35mm2..

You must tighten the cables to make good contact if you know you have high loads or the connection points will heat up, start to arc and loosen in time..

This post has been edited by Richard: Dec 23 2016, 12:41 AM

100A needs to have the correct current carrying capacity cable size..

If you go by Suruhanjaya Tenaga guidelines installation in conduit, it is 2x35mm2 copper conductor for live and neutral..

The problem is the standard cable size at the cutout fuse and Neutral link is 2x25mm2 or 2x16mm2 which means you can only put in a 60A/40A rated fuse..

If you want 100A single phase you need to pull a new 2x35mm2 copper cable from the mains to the cutout fuse , neutral link, kWH meter and DB to fully comply to ST guidelines..

Which is why it is normal practice to bring in another phase wire (25/16 mm2 copper) to cater for the additional load..

ok?

This post has been edited by Richard: Dec 23 2016, 10:42 AM

You must have been dropped on your head as a baby or your parents are siblings..

Can you read what I typed?

Edit * Is there some sort of brain drain going on in the west? Why is it this guy still commenting on posts he obviously cannot understand..

This post has been edited by Richard: Dec 23 2016, 10:49 AM

Google up electrical shops and your area name..

Ask for 4core/25mm2 (cross sectional area of the cu conductor) swa (steel wire armoured) underground cable..

If you're buying the material for your wireman you will need the correct size cable lugs, cable gland and some pvc wire tape so make sure to get those at the same time..

Hi,

For mutual benefit of the members here do you provide

- DB Service maintenance. Includes visual inspection, tighten wiring connections, mcb load checking and balancing (if necessary), RCD trip test (trip time and trip amps), cable insulation testing to Borang H format..
and submit the test results for home owners reference..

I believe some of us here are really interested as some homes have undergone renovations, additions/changes to the wiring thus a submitted test result signed by an ST competent would give peace of mind.

Reason for bulbs blowing are usually because of unstable voltage (high current thus thermal breakdown)..

The reason for unstable voltage is bad connection..

Make sure your terminals are solidly connected..

Get your wireman to check and rectify it.

Motor starting amps are 6-20 times rated.. you will need to get type D's make sure your breakers won't trip out..

True but nothing much an end user consumer can do..

For consumer side just make sure your phase / neutral connections are solidly connected and you have a separate earthing cable (below 10 Ohms using an earth tester) for the DB.

If you have 3 phase supply to balance your loads evenly among all phases.

Its all you can do and all that is expected of the consumer..

Any single phase overloading and phase load balancing at the LV transformer side is the responsibility of the power producer i.e. your TNB..

Its out of our hands..

And the incoming cable has to be 35mm2/50mm2 Cu to allow 100Amps single ph which are usually only 25mm2 i.e. 60Amp max.

You will have to upgrade incoming TNB cable size to allow single phase 100A.. Better to apply 3phase for that kind of loads.then they just pull another 2 wires 25mm2 Cu..

This post has been edited by Richard: Feb 21 2018, 07:05 PM

Correct.. hard drawn aluminium conductor o/h or copper armour u/g from feeder pillar .. depending on the load applied for in the original application for power.

Your TNB is the best answer,.

I think he means 3phase4wire armored cable that's been joined.

To answer it's usually because the contractor has separate lengths of similarly sized wires thus joining two (or more) would save the spare lengths.

However since the owner is paying then insists that a new installation must not have joined cables since the cable conductor wire strands not properly connected and the joint if burried underground risks of water seepage.

So being the boss just reject that work and get a properly measured cabled installed.

No idea how you can say that without any breakdown description of type of labour, quality of workmanship, quantity of material, installation details, etc

Better talk about the weather and rain .. same context..

Either yourself or contractor must have a dimension layout plan of your structure and external line of the 3ph electricity source.

1. The electrical contractor must then indicate on that layout plan the route of the existing 1ph and new 3ph wiring from source to your electrical db.

2. All electrical lighting pts, sockets and main electrical appliances must be indicated on the layout plan.

3. The existing and new wiring path shown on the layout plan.
Highlight new wiring line indicating cable size, ug/high level run from db to pt.

4. Do a quotation base on this drawing for the bill of materials, supply/install/transport/storage applicable labour and authority submission/follow-up/approval. Make good any damages during works or to client's acceptance.

5. Testing and commissioning.

6. Agreement to the quotation based on bill of qty i.e contractor owner payment schedule and period of completion

Use this guide line so the contractor can inform you and no arguments on scope of works.

First me see the material list and labour qty breakdown

Your question has no details except a general description and a lump sump figure