- exceeding of measuring current;
- electromotive force (emf) of self-induction.
At disconnection of the measuring cable from transformer bushings or from the instrument as well as at disconnection of the mains cable from the mains in the course of measurement, emf of self-induction of up to several kV is generated in the disconnected circuit and the electric arc appears in the break point.
MIKO-7М is characterized by the redundant protection against emf of self-induction in case of involuntary disconnection of the measuring cable or power cable protecting users from electric shock and the instrument from being damaged.
- a set of required protective means against superheat of the measuring unit;
- protection grounding contact in the mains plug and safety earthing terminal on the case of the measuring unit.