For some electrical appliances, they must be built with an isolator switch during installation so that they can be reliably used and maintained. This isolator switch is intended to isolate power from the device that needs repair or maintenance, ensuring there is no chance of electric shock and fire risk when repairs are undertaken.
Air Conditioning Equipment
An air conditioner usually comes with a dedicated isolator switch. The reason is that air conditioners consume a significant amount of electrical energy, and full power cut-off is required for maintenance.
According to IEC standards, the power range for an air conditioner is typically from 1.5 kW to 5 kW, and employing an isolator switch within this range can be beneficial as a protective measure against electrical defects.
Electric Water Heaters
To allow for full power isolation when servicing, an electric water heater must be fitted with an isolator. For example, common household electric water heaters have a power rating ranging from 3 kW to 6 kW. Without an isolator switch, there may be safety issues during maintenance.
Electric Motors
Electric motors are widely used in household and industrial applications, including air conditioning compressors and washing machines. Larger electrical power units, such as electric motors, can consume significantly more power.
According to Section 35 (Electrical Equipment Installation Specifications) of Book One, for large machinery drawing above moderate power, a remote switch is essential for enabling a safe system shutdown and preventing accidental reactivation during repairs.
Solar Inverters
For solar power generation systems, inverters should have an isolator switch to safely switch off the power for maintenance work. Solar inverters typically have an output power ranging from 1 kW to 5 kW, ensuring that maintenance does not pose a risk of electric shock.
| Device Type | Power Range | Requires Isolator Switch |
|---|---|---|
| Air Conditioning Equipment | 1.5 kW - 5 kW | Yes |
| Electric Water Heater | 3 kW - 6 kW | Yes |
| Electric Motor | Up to 15 kW or higher | Yes |
| Solar Inverter | 1 kW - 5 kW | Yes |
This can not only effectively improve the safety of the devices but also make it much easier for maintenance personnel to operate when repairing equipment. The needs of different electrical appliances will logically be brand-specific; however, in all cases, electrical regulations and the recommendations of the manufacturers should be followed.
