MI 3290 Earth Analyser
Tests and Measurements
106
11.7.2 Step and Touch Voltages Theory
Step Voltage
The measurement is performed between two ground points at a distance of 1 m as shown on
Figure. The metal plates (S2053) simulates the feet. The voltage between the probes is
measured by a voltmeter (MI 3295M)
with an internal resistance of 1 kΩ that simulates the
body resistance.
E a r t h
Igen
H
E
M
I 3
29
0
E
ar
th
A
na
ly
se
r
G
V
A
H - auxiliary
earth rod
≥ 5a
a
1m
1k
Metal plates
MI 3295M
Figure 11.78: Step Voltage example
Touch Voltage
The measurement is performed between an earthed accessible metal part and ground 1 m
apart as shown on Figure. The voltage between the metal plates (S2053) is measured by a
voltmeter (MI 3295M) with an internal resistance of 1
kΩ that simulates the body resistance.
E a r t h
Igen
H - auxiliary
earth rod
≥ 5a
a
1m
Metal plates
V
1k
MI 3295M
H
E
M
I 3
29
0
E
ar
th
A
na
ly
se
r
G
A
Figure 11.79: Touch Voltage example
