KYORITSU 5406A - Manual (Page 15)

― 13 ―
5.2 RCD test ON "OLD TT SYSTEM"
CAUTION
M5406A can operate in OLD-TT system with the follwing I⊿n,
however, the accuracy is not assured. The instrument does not
operate with other I⊿n.
Ч1/2,Ч1,DC TEST, AUTO RAMP TEST…I⊿n:10mA, 20mA,
30mA, 200mA, 300mA
×5…I⊿n:10mA, 20mA, 30mA, 200mA
Old TT system is a TT system with phase to phase voltage of 220V (instead
of 400V) and phase to earth of 127V (instead of 230V) and normally the
neutral conductor is not used.
Before connecting the model 5406A to this system check by a voltmeter (or
a DMM) in order to be sure that the voltage between each phase to earth is
127V (+/-10%).
WARNING
Do not press the "Test button" if the voltmeter reads a value of
220V.
Connecting the model 5406A to this system, all three wiring check LEDs should be lit.
Fig. 8
L1
L2
L3
PE
R R O
RCD
2 20 V
2 20 V
2 20 V