Earth ElEctrodE / Earth loop rEsistancE

continuity of pE conductors / conductivE parts

nominal differntial current i∆n (ma) 10 30 100 300 500 1000

r earth (Ω) max. (uc 0.5 mΩ for PELV/SELV floor and wall resistance/impedance r > 50 kΩ (insulated) semiconductive coatings 1 mΩ < r > 1 gΩ Protection against static electricity (EN 61340-5-1)

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.

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:

0.1 s (Explosive), 0.2s (3Phase Circuits), 0.4 s (1Phase systems) or 5 s (fixed connections).

Measured values of Impedances from the end of the circuit must be lower than Zs from the table.

In (A)

tip b tip c tip gIa=5x In (A)

Zs=(Ω) (0,2 s)

Ia=10x In(A)

Zs=(Ω) (0,2 s)

In(A)

Zs=(Ω) (0,4 s)

2 10 22 20 11 16 13,74 20 11 40 5,5 32 6,86 30 7,3 60 3,65 47 4,6

10 50 4,4 100 2,2 82 2,616 80 2,8 160 1,4 110 2,020 100 2,2 200 1,1 147 1,4

rcd: trip out time, trip out current iEc 60364-6 61.3.6.1., 61.3.7., equipment: iEc 61557- 6

More Parameters/Limits could be found in Metrel Handbooks and inside Eurotest/Smartec testers.

RCDrcd trip out at differential id (ms)

1/2 x I∆N 1 x I∆N 2 x I∆N 5 x I∆N

General No trip t∆ < 300 t∆ < 150 t∆ < 40

Selective No trip 130 x t ∆ < 500 60 x t∆ < 200 50 x t∆ < 150

RCD slope range (from-to)

0,5 ÷ 1.0 x l∆N AC

A 0,35 ÷ 1.4 x l∆N

B 0,5 ÷ 2.0 x l∆N

L1

L2L3

PE

N

TT

3

www.metrel.si

ANG Code: 20 752 423 Ver 1.0.

Poster_Verification on Low-voltage electrical installations_ANG_Ver 1.0._20 752 423.indd 1 7.7.2015 7:45:03