User Manual

ManualsBrandsGossen Metrawatt ManualsTest EquipmentGossen Metrawatt M535C Electrical tester set Calibrated to DAkkS standards

18 GMC-I Messtechnik GmbH

6.2 3-Phase Measurement (line-to-line voltage) and Phase

Sequence

Connection

The measuring adapter

(2-pole) is required in

order to connect the

instrument, and can be

expanded to a 3-pole

measuring adapter with

the included measure-

ment cable.

➭ Press softkey U3~.

A clockwise phase

sequence is required at all 3-phase electrical outlets.

• Measurement instrument connection is usually problematic with

CEE outlets due to contact problems.

Measurements can be executed quickly and reliably without con-

tact problems with the help of the Z500A variable plug adapter

set available from GMC.

• Connection for 3-wire measurement, plug L1-L2-L3 in clockwise

direction as of PE socket

Direction of rotation is indicated by means of the following dis-

plays:

Note

See section 18 regarding all indications for the mains

connection test.

Voltage Polarity

If the installation of single-pole switches to the neutral conductor

is prohibited by the standards, voltage polarity must be tested in

order to assure that all existing single-pole switches are installed

to the phase conductors.

7 Testing RCDs

The testing of residual current devices (RCDs) includes:

• Visual inspection

•Testing

• Measurement

Use the test instrument for testing and measurement.

Measuring Method

The following must be substantiated by generating a fault current

downstream from the RCD:

• That the RCD is tripped no later than upon reaching its nomi-

nal fault current value

• That the continuously allowable contact voltage value U

agreed upon for the respective system is not exceeded

This is achieved by means of:

• Contact voltage measurement, 10 measurements with full-

waves and extrapolation of I

ΔN

• Substantiation of tripping within 400 ms or 200 ms with I

ΔN

• Substantiation of tripping with current rising residual current:

This value must be between 50% and 100% of I

ΔN

(usually

about 70%).

• No premature tripping with the test instrument, because test-

ing is begun with 30% residual current (if no bias current

occurs within the system).

* PROFITEST MTECH+, PROFITEST MXTRA & SECULIFE IP

Clockwise

Counter-Clockwise

RCD/FI Table Type of Differential

Current

Correct RCD/RCCB

Function

Type AC

Type A, F

Type B*/

B+*

Type

EV*/MI*

Alternating

current

Suddenly occurring

✔✔✔✔

Slowly rising

Pulsating di-

rect current

Suddenly occurring

✔✔✔

Slowly rising

Direct current

✔✔

Direct current

up to 6 mA

✔

ΔN

-------

ΔN

(measurement up to 1000 ms)