Insulated spanners are simply spanners that are electrically insulated. This means they can be safely used on electrical circuits without risk of an electric shock.
A plastic coating around the spanner handle and sometimes over its head provides an insulated barrier which prevents electricity passing into the user.
Any type of spanner can be insulated.
If they bear the ‘VDE’ mark they comply with European standards and are safe to use on live wires of up to 1000 volts AC (alternating current), making them the choice of qualified electricians.
