This International Standard is applicable to portable phase comparators with or without a builtin
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.
BS EN 61481:2001 history
2015BS EN 61481-1:2014 Live working. Phase comparators. Capacitive type to be used for voltages exceeding 1 kV a.c
2002BS EN 61481:2001 Live working — Portable phase comparators for voltages of 1 kV to 36 kV a.c.