Manual Gossen Metrawatt Profitest Intro (page 24 of 62) (English)

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24 GMC-I Messtechnik GmbH

7.3.4 Type G or R RCCB

In addition to standard RCCBs and selective RCDs, the special

characteristics of the type G RCCB can also be tested with the

test instrument.

The type G RCCB is an Austrian specialty and complies with the

ÖVE/ÖNORM E 8601 device standard. Erroneous tripping is min-

imized thanks to its greater current carrying capacity and short-

term delay.

Select the Measuring Function

Set Parameter – Type G/R (VSK)

Touch voltage and time to trip can be measured in the G/R-RCD

switch position.

Note

It must be observed that time to trip for type G RCCBs

may be as long as 1000 ms when measurement is made

at nominal residual current. Set the limit value corre-

spondingly.

➭Then select 5 x IΔN in the menu (this is selected automatically

for the G/R setting) and repeat the tripping test beginning with

the positive half-wave at 0° and the negative half-wave at

180°. The longer of the two tripping times is decisive regard-

ing the condition of the tested RCCB.

Set the Parameter – Start with Positive or Negative Half-Wave

Set the Parameter – 5 Times Nominal Current

Note

The following restrictions apply to the selection of tripping

current multiples relative to nominal current:

500 mA: 1 x, 2 x IΔN

Start Measurement

In both cases tripping time must be between 10 ms (minimum

delay time for type G RCCBs!) and 40 ms.

Type G RCCBs with other nominal residual current values must

be tested with the corresponding parameter setting under menu

item IΔN. In this case as well, the limit value must be appropriately

adjusted.

Note

The RCD parameter setting for selective RCCBs is not

suitable for type G RCCBs.

7.4 Testing Residual Current Circuit Breakers in TN-S Systems

Connection

RCCBs can only be

used in TN-S systems.

An RCCB would not

work in a TN-C system

because PE is directly

connected to the neu-

tral conductor in the out-

let (it does not bypass

the RCCB). This means

that residual current

would be returned via

the RCCB and would

not generate any differ-

ential current, which is

required in order to trip

the RCCB.

As a rule, the display for touch voltage is also 0.1 V, because the

nominal residual current of 30 mA together with minimal loop

resistance result in a very small voltage value:

IΔN

Type 1:

180°: Start with negative half-wave

0°: Start with positive half-wave

Waveform:

Positive direct current

5 times tripping current

UIΔNR

EIΔN•1Ω30mA⋅30mV 0 03V,== ==

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Gossen Metrawatt Profitest Intro Manual

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