The Whats and Hows of Resistance Testers
Insulation has an important role in electrical systems, from basic wires and cables to more complex and high-power components, such as industrial machinery, motors, and transformers. It is tasked with resisting current and keeping it on its designated path through the metal conductor. In simple terms, it prevents electricity from leaking, while also shielding conductors from environmental factors, such as water and heat.
Damage to insulation can lead to a variety of unwanted issues, from dim or flickering lights, damage to expensive appliances and machines, or electrical faults, such as short circuits or electrical fires. But the main reason you'd want insulation in top condition is to minimise the risk of electrocution and burns.
Assessing the quality of the insulation in cables, appliances, installation, machinery, and more is done with thorough testing using a resistance tester. This passes a defined voltage through the insulation to measure the resistance. Higher values, usually in mega or gigaohms, indicate that it is in good condition and won't pose safety risks. Lower values, often point to insulation that is fraying, cracked, or more severely damaged and something that can mean expensive repair costs or serious injury.