The PU690 enables you to prove your 2 pole voltage indicator by supplying a 690V AC voltage to the two input terminals. With the inbuilt load of 200k ohms, at 690V the current is limited to 3.5mA. In addition, the PU690 is also is also suitable to prove High and Low Impedance devices such as multimeters and clamps.
“Adequate precautions shall be taken to prevent electrical equipment, which has been made dead in order to prevent danger while work is carried out on or near that equipment, from becoming electrically charged during that work if danger may thereby arise”.
Regulation 13 of the Electricity at work Regulations 1989