that it does not offer shock protection from a hazardous voltage. However, it does help to mitigate electromagnetic noise or EMI. This is often important in Audio and Medical design. Note as they also include double insulation it means that users will not be able to come into contact with any live parts. Class III A Class III appliance is designed to be supplied from a separated extra-low voltage (SELV) power source. The voltage from a SELV supply is low enough that under normal conditions a person can safely come into contact with it without risk of electrical shock. The extra safety features built into Class I and Class II appliances are therefore not required. Specifically, class III appliances are designed without an earth conductor and should not be connected to the earth grounding of the SELV power source. For medical devices, compliance with Class III is not considered sufficient protection, and furthermore, stringent regulations apply to such equipment. Class III appliances are safe to use under "normal" conditions. All electrical equipment should be treated with care and consideration; even with low voltage or power, abusive or unintended actions (e.g. disassembly, overheating, or an incorrect power supply) may still produce dangerous faults. Whilst Class III equipment is considered safe to use without the risk of an electrical shock it does not mean that it will not develop a fault which could be a fire risk. If we take a computer laptop as an example which is powered by a Separated Extra Low Voltage power source. The power source is actually charging the battery of the laptop enabling the laptop to be functional whilst it is being used. The weak link here is the battery itself. Should the battery become faulty and overheat then there is a possible fire risk. Phone chargers are another example, technically the charger is normally a Class II product but the phone itself could be considered a Class III product since the battery is being charged from a SELV source. There are many other products which have to be powered by a SELV source which are charging batteries whilst they are being used and it is the battery that could be prone to overheating. Note the fact that Class III equipment is considered sufficient protection for medical devices of which could include a number of other random devices. See also Double switching IP Code Mains power