Image source: The Straits Times, ‘Improper heater wiring caused boy’s death while showering
The improper installation and wiring of a water heater is one of the factors that can lead up to an electrocution. The 2016 electrocution was caused by two main issues as described below:
1. Do not use a 13A 3-pin plug
A 3-pin plug usually has a power rating of 13A, that is insufficient for a high wattage appliance. You need at least a 15A power source for a water heater. Using a 13A socket may cause your wires to overheat, melt and fuse together, leading to a short circuit.
In newer houses, a 15/20A front flex outlet is already provided for you. Connect your water heater wire directly to this. In older HDB estates, connect the water heater wire to a ceiling rose instead. If you are living in private housing, you may have an outdoor connection unit, which is called the ‘isolator’. Refer to images below for a description of all parts.
2. Secure wires properly so they do not melt into each other
Image source: How-To Geek, ‘Fixing damaged or broken cables’
Some contractors join wires and secure them with tape. This results in a neat looking wire finish but manual wire joining with tape creates higher areas of resistance and overheating. This results in higher chances of wires fusing together and causing a short circuit.
A better solution for joining wires is using a closed end wire connector. These wire connectors do not look as neat but they are more resistant to melting and fusing. They are also safer and more durable.
Like taped wires, wire connectors are usually left exposed. This is 100% safe. The wires are usually run to an area that is hidden and out of sight.
3. Check your circuit board for faults
