Guide through Verification on Low-voltage electrical installations: IEC 60364-6
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Insulation Resistance Line / Neutral to PE
Fuse: Z loop L-PE / Z line L-L, L-N IEC 60364-6 61.3.6.3., 61.3.11., equipment: IEC 61557- 3
Parameters / Limits are characteristics of particular built-in Fuse, designed for trip-out time of:
0.1s (Explosive), 0.2s (3Phase Circuits), 0.4s (1Phase systems) or 5s (fixed connections).
Measured values of Impedances from the end of the circuit must be lower than Zs from the table.
IEC 60364-6 61.3.3., equipment: IEC 61557-2
Parameters:
500 V DC
250 V DC for PELV/SELV
Limits on Circuits:
R min > 1 MΩ
R min > 0.5 MΩ for PELV/SELV
In
(A)
2
4
6
10
16
20
Floor and wall resistance/impedance
R > 50 kΩ (insulated)
Semiconductive coatings
1 MΩ < R > 1 GΩ
Protection against static
electricity (EN 61340-5-1)
Tip G
In
Zs=(Ω)
(A)
(0,4 s)
16
13,7
32
6,8
47
4,6
82
2,6
110
2,0
147
1,4
More Parameters/Limits could be found in Metrel Handbooks and inside Eurotest/Smartec testers.
Leakage Current - alternative method for testing and tracing insulation
problems without disconnection
Parameters:TRMS Low range measurement
Limits: 1 mA/kW or 3.5 mA max. per app.
5 mA max. where heating app.
1/3 x Idn where RCD protected circuits.
Leakage < 100 mA for fire protection.
2
Tip B
Tip C
Ia=5x Zs=(Ω) Ia=10x Zs=(Ω)
In (A) (0,2 s) In (A) (0,2 s)
10
22
20
11
20
11
40
5,5
30
7,3
60
3,65
50
4,4
100
2,2
80
2,8
160
1,4
100
2,2
200
1,1
RCD: Trip out time, Trip out Current IEC 60364-6 61.3.6.1., 61.3.7., equipment: IEC 61557- 6
RCD trip out at differential current Id (ms)
RCD Slope range (from-to)
RCD
 AC
1/2 x I∆N
1 x I∆N
2 x I∆N
5 x I∆N
0.5 ÷ 1.0 x I∆N

General
No trip
t∆ < 300
t∆ < 150
t∆ < 40
0.35 ÷ 1.4 x I∆N
A

Selective No trip 130 x t∆ < 500 60 x t∆ < 200 50 x t∆ < 150
0.5 ÷ 2.0 x I∆N
B
Protection by automatic disconnection of the supply
AUTO SEQUENCE ®
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Continuity of PE conductors / conductive parts
IEC 60364-6 61.3.2., equipment: IEC 61557- 4
Parameters:
±200 mA both directions, all exposed conductive
parts to MPE and in between where distance < 2.5 m.
U
50V
R≤ c ≤
≤ 0,25Ω
Limits:
200A
I
(where Fuse C20A built-in)
pfc
or
2 Ω max. (where RCD built-in)
TN system - Two clamps
- clamps arround main N/PE cable
L1
TT system - Two wire
- test from the socket N to PE
PE
- test leads to rods in triangle
L1
L2
L3
N
L2
L3
N
TN
IT system - Three wire
TT
PE
L1
L2
L3
N
TT
PE
Limits: Where no RCD, select limit from the FUSE characteristics, test by Z loop. Where RCD:
Nominal Differntial current I∆N (mA)
10
30
100
300
500
1000
R earth (Ω) max. (Uc<25 V)
2500
833
250
833
50
25
Earth Electrode / Earth Loop Resistance
IEC 60364-6 61.3.6.2., B.3., equipment:
IEC 61557- 5
Limits:
2 Ω above ground
10 Ω whole system
10 Ω underground per
leg or
8% of Specific Earth
Resistance
Lightning system & Earth loops - Two clamps - test each loop
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Reports and Certificates on Low-voltage electrical installations: IEC 60364-6