EL is short for “Emergency Lighting”, the extra “T” in EL-T stands for “Automatic Testing”. This means, EL defines the basic requirements that are relevant for all emergency lighting control gear, EL-T includes all of these basic requirements plus some additional ones that are relevant for automatic testing. EL and EL-T are self-compliance marks. They confirm that emergency lighting control gear comply with all the relevant standards. Like the CE mark, EL and EL-T work as self-compliance mark. This means that the manufacturer is responsible for putting on the mark. The marks can be used without further investigation through an external certification body.