Typical Measurements; Limits - Chauvin Arnoux C.A 6460 Notice De Fonctionnement

4.6.4

Typical measurements

The following measurements are representative on-site
Common measurement conditions
- Ambient temperature
- 10.5 V power supply voltage
Measurement of three wire ground resistance
- with 5 kΩ in each of the rods H and S,
- with 5 V sinusoidal spurious voltage at 50 Hz in H and in S,
RMS
The error with respect to the real R values is less than 4% ±5 pt.
(For resistance included between 0 and 20 Ω, the
measurement can be displayed for calibre 2).
Four wire resistitivity measurement
- with 5 kΩ in each of the four rods,
- with 5 Vrms sinusoidal spurious voltage at 50 Hz in H and in S,
The error with respect to the real R values is less than 4% ±5 pt.
(For resistance included between 0 and 20 Ω, the
measurement will be displayed for calibre 2).
Note: The same measurements with rod resistances of 1kΩ
instead of 5 kΩ would give an error of less than 1% ±2 pt.
4.6.5

Limits

According to NF EN 61557 part 5, free of damage when
connected to 120 % of the network voltage to which it is
assigned. The user must not be exposed to voltage exceeding
the contact voltage and the protection devices must not
activate.
C.A 6460 and C.A 6462 are designed to operate with the
network de-energised but if wrong manoeuvres are carried
out, the equipment is designed to withstand and overload
applied permanently between any two terminals for: 250 V
or 100 V , with the possible blowing of the fuse.
DC
31
AC