HT instruments FULLTEST3 User Manual
Page 40
FULLTEST
3
EN - 39
5.7. GLOBAL EARTH RESISTANCE / CONTACT VOLTAGE (RA)
• According to EN 60204-1, the conditions for protection against electric shock in installations with
automatic disconnection of mains voltage are:
• Measurement or evaluation of fault loop impedance and testing the over-current protection device
involved in the fault loop.
• Limit values are shown in the Table 10 of EN 60204-1.
5.7.1. R
A
LIMIT VALUE CALCULATION
The global resistance R
A
should be lower than or equal to U
C LIM
/ I
N
, where limit contact voltage U
C
can be set to 25 or 50 V.
Example: Selected
U
C LIM
= 50 V
Selected
I
N
= 300 mA
R
A LIM
= 166.7
How to select limit contact voltage U
C LIM
:
Press the MENU
SETUP CONTACT VOL. touch-screen keys and select 25 V or 50 V.
5.7.2. R
A
DISPLAY EXPLANATION
Selectable parameter:
I
N
nominal differential current
10, 30, 100, 300, 500, 650 or 1000 mA
Figure 27
: Display with R
A
test result
1 ..... Selected function.
2 ..... Selected limit contact voltage (25 or 50 V).
3 ..... READY message. It is displayed when mains voltage U
L/PE
within 100 ... 265 V is present.
4 ..... Sub-results, mains voltage U
L/PE
at which the measurement was carried out and contact voltage
U
C
at nominal differential current.
5 ..... Measurement screen touch-screen key.
6 ..... I
N
touch-screen key to select nominal differential current. Currently selected value is displayed in
the bottom of the key.
7 ..... Measurement result (in green colour - result OK, in red colour - result not OK).
8 ..... Real time clock (hh.mm.ss).
9 ..... Unit of the test result.
10 ... Measurement result status (symbol
in green colour - result OK, symbol
in red colour - result
not OK).