Guys, I am electrical engineering students but now working on something else. But suffice to say copper is very expensive commodity nowadays. The price is doubled.

My suggestion to you is do whole house continuity test for what you can still use. Copper especially the old one is of very good quality. Nowadays although still sirim, the quality level is greatly vary. The cost would start MYR 300 plus.

So after electrician have check your wiring is okay or not, then you change the distribution board. i believe your house 2 2 storey right, so i think it is cheaper and long term to have second DB upstairs. Also one important thing is to understand how much incoming you need (based on your load) and also purchase as big as possible (well based on your setup) distribution board to go with.

My previous bungalow i do, 1 storey the kitchen area require more space then the front one. Also if you want to use strictly code the cost will add up quickly, also the space DIN rail inside your distribution board.

Yes I agree, in fact i do this at my customer house 2 earth leakage circuit breaker/RCCB 1 using 100mA sensitivity and the other 30mA sensitivity. That would be 2 for each DB. 100mA is what difficult to touch like fan and lighting because whereas 30mA like power points etc. Also do adopt new 10mA for each water heater, best to be safe then sorry. With that if you have 3 bathroom, also with minimum 4mm wire the cost is very high.

you need more info please reply, I can reply to what you need. My priciple is always consultation is free for my client. If meter not touch, i dont think we require to called up TNB personnel, only wiremen will do.