Gossen MetraWatt SECUTEST ST BASE - Measuring Protective Conductor Resistance - RPE

46 Gossen Metrawatt GmbH
15.6 Measuring Protective Conductor Resistance – RPE
1
10/25 A RPE measurements are only possible with line voltages of 115/
230 V and line frequencies of 50/60 Hz.
2
Connection for 2
nd
test probe for two-pole measurement with test instru-
ment including feature H01(e.g. SECUTEST ST PRO/SECULIFE ST
BASE(25))
3
Can only be selected if the IP(set) parameter has been set to 10 A~,
only with test instruments including feature G01 (e.g. SECUTEST ST PRO/
SECULIFE ST BASE)
4
Can only be selected with SECUTEST ST BASE or if the IP(set) parameter
has been set to 200 mA.
Application, Definition, Measuring Method
Protective conductor resistance is the sum of the following resis-
tances:
• Connector cable or device connector cable resistance
• Contact resistance at plug and terminal connections
• Resistance of the extension cord if applicable
Protection Class I DUTs
– Measurement type PE(TS) - P1 (passive)
– DUT mains plug to test socket
– Test probe P1 to P1 terminals
Schematic Diagram
Protective conductor resistance is measured between the earth-
ing contacts at the mains plug and the earthing contact con-
nected to the housing by contacting the housing with test probe
P1.
Wiring Diagram
Measurement of RPE at Single-Phase Extension Cords with EL1
– Measurement type PE(TS) - P1 (passive)
– Extension cord plug to test socket
– EL1 to P1 terminals
Schematic Diagram
Wiring Diagram
Protection Class I DUTs
Special Case: Line Voltage at Test Socket (for testing PRCDs)
– Measurement type PE(TS) - P1 (active)
– DUT mains plug to test socket
– Test probe P1 to P1 terminals
Schematic Diagram
Protective conductor resistance is measured between the earth-
ing contacts at the mains plug and the earthing contact con-
nected to the housing by contacting the housing with test probe
P1.
Single Measurements, Rotary Switch Level: Green
Rotary Switch Position
Meas. Type
With Mains
to Test
Socket
Meas. Type
Without
Mains
to Test
Socket
Measuring Functions
R
PE
Protective conductor
resistance
Ip Test current
200 mA
10 A
1
25 A
1
R
PE
Passive:
PE(TS) - P1

Active:
PE(TS) - P1
4

PE(mains) - P1

PE(mains) - P1
clamp
3

P1 - P2
2

R
PE