User Manual
Table Of Contents
- 1 Scope of Delivery
- 2 Application
- 3 Safety Features and Precautions
- 4 Initial Start-Up
- 5 General Notes
- 5.1 Connecting the Instrument
- 5.2 Automatic Settings, Monitoring and Shut-Off
- 5.3 Measurement Value Display and Memory
- 5.4 Testing Earthing Contact Sockets for Correct Connection
- 5.5 Help Function
- 5.6 Setting Parameters or Limit Values using RCD Measurement as an Example
- 5.7 Freely Selectable Parameter Settings or Limit Values
- 5.8 2-Pole Measurement with Fast or Semiautomatic Polarity Reversal
- 6 Measuring Voltage and Frequency
- 7 Testing RCDs
- 8 Testing of Breaking Requirements for Overcurrent Protective Devices, Measurement of Loop Impedance and Determination of Short-Circuit Current (functions ZL-PE and IK)
- 9 Measuring Line Impedance (ZL-N function)
- 10 Earthing Resistance Measurement (RE function)
- 11 Measurement of Insulation Resistance
- 12 Measuring Low-Value Resistance up to 200 Ohm (protective conductor and equipotential bonding conductor)
- 13 Special Functions – EXTRA Switch Position
- 14 Database
- 15 Attaching the Test Probe Holder to the Carrying Strap
- 16 LED Indications, Mains Connections and Potential Differences
- 17 Characteristic Values
- 18 Maintenance
- 19 Appendix
- 19.1 Tables for Determining Maximum or Minimum Display Values in Consideration of Maximum Measuring Uncertainty
- 19.2 At which values should/must an RCD actually be tripped? Requirements for Residual Current Devices (RCDs)
- 19.3 Periodic Testing per DGUV Regulations 3 (formerly BGV A3) – Limit Values for Electrical Systems and Operating Equipment
- 19.4 Optional Accessories (not included)
- 19.5 List of Abbreviations and their Meanings
- 19.6 Keyword Index
- 19.7 Bibliography
- 20 Repair and Replacement Parts Service Calibration Center* and Rental Instrument Service
- 21 Recalibration
- 22 Product Support
22 GMC-I Messtechnik GmbH
7.3 Testing of Special RCDs
7.3.1 Systems with Type RCD-S Selective RCCBs
Selective RCCBs are used in systems which include two series
connected RCCBs that are not tripped simultaneously in the
event of a fault. These selective RCCBs demonstrate delayed
response characteristics and are identified with the symbol.
Measuring Method
The same measuring method is used as for standard RCCBs (see
sections 7.1 on page 18 and 7.2.1 on page 20).
If selective RCCBs are used, earthing resistance may not exceed
half of the value for standard RCCBs.
For this reason, the instrument displays twice the measured value
for touch voltage.
Select the Measuring Function
Set Parameter – Selective
Start Measurement
Tripping Test
➭ Press the I
∆N
key. The RCCB is tripped. Blinking bars appear
at the display panel, after which time to trip t
A
and earthing re-
sistance R
E
are displayed.
The tripping test need
only be performed at
one measuring point for
each RCCB.
Note
Selective RCCBs demonstrate delayed response charac-
teristics. Tripping performance is briefly influenced (up to
30 s) due to pre-loading during measurement of touch
voltage. In order to eliminate pre-charging caused by the
measurement of touch voltage, a waiting period must be
observed prior to the tripping test. After the measuring
sequence has been started (tripping test), blinking bars
are displayed for approximately 30 seconds. Tripping
times of up to 1000 ms are allowable. The tripping test is
executed immediately after once again pressing the I
∆N
key.
7.3.2 PRCDs with Non-Linear Type PRCD-K Elements
The PRCD-K is a portable RCD with electronic residual current
evaluation laid out as an inline device which switches all poles (L,
N and PE). Undervoltage tripping and protective conductor moni-
toring are additionally integrated into the PRCD-K.
The PRCD-K is equipped with undervoltage tripping, for which
reason it has to be operated with line voltage, and measurements
may only be performed in the on state (the PRCD-K switches all
poles).
Terminology (from DIN VDE 0661)
Portable protective devices are circuit breakers which can be con-
nected between power consuming devices and permanently
installed electrical outlets by means of standardized plug-and-
socket devices.
A reusable, portable protective device is a protective device which
is designed such that it can be connected to movable cables.
Please be aware that a non-linear element is usually integrated
into PRCDs, which leads to immediate exceeding of the greatest
allowable touch voltage during U
I∆
measurements (U
I∆
greater
than 50 V).
PRCDs which do not include a non-linear element in the protec-
tive conductor must be tested in accordance with section 7.3.3
on page 23.
Objective (from DIN VDE 0661)
Portable residual current devices (PRCDs) serve to protect per-
sons and property. They allow for the attainment of increased lev-
els of protection as provided by protective measures utilized in
electrical systems for the prevention of electrical shock as defined
in DIN VDE 0100-410. They are to be designed such that they
can be installed by means of a plug attached directly to the pro-
tective device, or by means of a plug with a short cable.
S
I
∆N
Or
I
F
Type 1: