5 Installation at Site
33 of 98
UPA / UPA S
3400.86/17-EN
5.2.8 Measuring the insulation resistance
DANGER
Hazardous voltage during and after measurement
Danger of death from electric shock!
▷
Do not touch the contact points during and immediately after measurement.
▷
Insulation resistance measurement must be effected by a trained electrician
only.
1.
Measure the insulation resistance prior to installation and prior to connection to
the power supply.
2.
Insulation resistance measurement must be effected by a trained electrician only.
3.
Prior to the measurement, ensure compliance with the operating manual of the
insulation resistance measuring device.
ü
An insulation resistance measuring device with a measuring voltage of 1000 V DC
is available.
ü
The contact points are clean and dry.
1. Measurement period: 1 minute
13)
2. Recommendation: insulation resistance at 20 °C - 30 °C: > 200 MOhm
14)
V
W
U
Rinsul
(MΩ)
M 3~
Lorem ipsum
Fig. 8:
Insulation resistance measurement, 1 power cable
V1
W1
U1
Risol
(MΩ)
M 3~
V2
W2
U2
Fig. 9:
Insulation resistance measurement, 2 power cables (open)
13
The measured value must be steady. A longer measurement period might be needed for larger cable cross-
sections.
14
The insulation resistance depends on the cable type and cable length.