This International Standard is applicable to portable phase comparators with or without a built-in power source to be used on electrical systems for voltages from 1 kV to 36 kV a.c. and frequencies from 50 Hz to 60 Hz.
This standard is applicable to two-pole phase comparators having a connecting lead between them, two-pole phase comparators operating with a wireless connection and single-pole phase comparators operating with a memory system.
This standard is applicable to phase comparators used in contact with the part to be tested, as a single unit or as a separate device completed by an adaptable insulating pole covered in IEC 60855 or IEC 61235.
Some restrictions on their use are applicable in the case of factory-assembled switchgear and on overhead systems of electrified railways (see annex B).
Devices which can be used as voltage detector and phase comparator are not covered by this standard.
NOTE Except when otherwise specified, all the voltages defined in this standard refer to phase-to-phase voltages of three-phase systems. Phase comparators may be used in other than three-phase systems, but the applicable phase-to-phase or phase-to-earth (ground) voltage must be used to determine the operating voltage.