You are playing with high voltage live wires. This is the job for TNB, not even the developer. Wearing protective gloves is not enough, you should also wear rubber boots and a plastic or wooden stool/ladder on dry floor.

Loose cable can cause rccb to trip I had similar experience but I called TNB and they fixed it for free.

Sometimes by changing to a new RCCD will solve the problem even with same brand and made. Even thunderstorm is far away it can affect the RCD to trip. if that is the case get it changed.

There are other causes like loose connection that increase and decrease the resistance and sometimes due to live or neutral wires touching some metal that linked the house like the plaster ceiling metal trusses that are usually connected to earth via the downlight reflector holder. Even if you call an electrician to check it will hell of a puzzle. But never change to higher rating even if being advised to lessen the sensitivity.

No trip no protection, Already with 100ma you could be half dead. then don't use at all if tripping is the real problem, afterall it serves no real protection. There are many 30ma around not only 0.1ma except that it is more expensive. I am not being sarcastic, just that you mislead other people and it is an advice you ought to take.

I hv two. One 100ma for whole house, one 30ma for my koi pond. No tripping problem

I did say no tripping problem, didn't I?

According to Fengshui, fire and water do not get along well. Electricity running the water pump being fire and pond is water it means danger. To double protect I added the 30ma RCD to the pond circuit.

When you have a pond you should have it protected with another RCD. Few years back there was news kid(s) killed playing water of a fountain but no further news on that what cause the electrocution. You see, without a sensitive RCD I will not dare touching the pond water. It is just like having a seat belt plus airbag driving. It is not if but when accident will happen.

By the way, if you suspect your koi pond is causing the trip, you better don't touch the water.

It will not unless there is a connection/leaked to earth. The pond water is contained or isolated in the pond so when there is no earth (current got nowhere to go) it is not passing any bodies just like birds sitting on overhead live wires and dont die and fall.

You can put a bulb in a glass water tank and a +ve live wire, the bulb wont light up. You use a test pen tip touching a house live wire and your finger at the other end of the test pen (like you used to test for live current) and you are wearing rubber shoes, the test pen hard to get light up becuase there is no proper connection to earth but when you touch something like a concrete wall the test pen lights up without hesitation Dont play play

The word is dont touch the water. You can jump into the water and still live. Touch die, jump no die.