Omicron HGT1 User Manual

OMICRON 29
Step and touch voltage measurements
As an example, Figure 8-5 below shows the touch voltage measurement according to EN 50522.
Figure 8-5: Touch voltage measurement according to EN 50522
Table 8-1: Step and touch measurements according to EN 50522 and IEEE 81
Standard Measurement Ground electrode
Input imped.
EN 50522:2011 Touch voltage 20 cm X 20 cm metal plate loaded with min. 50 kg,
1 m apart from grounded structure. Wetten the soil
underneath the plate.
1kΩ
1
1. This standard also proposes to consider additional resistances for the assessment of the measurement, which requires a high
ohmic input impedance.
Step voltage This standard assumes that the limits for step
voltage are much higher than for touch voltage.
Therefore, step voltage measurements are
considered obsolete.
-
IEEE 81-2012 Touch voltage Rod (6 mm diameter) driven 150 mm into moist
subsoil, 1 m apart from grounded structure.
High Z
Step voltage Two rods (6 mm diameter) each driven 150 mm into
moist subsoil, 1 m apart from each other.
High Z
1 kΩ
V
1 m
Test probe
20 cm X 20 cm metal plate loaded with min. 50 kg

Omicron HGT1 Specifications

General

Brand	Omicron
Model	HGT1
Category	Test Equipment
Language	English