IEC 60884-1 Clause 12.3.11 Screwless Terminals Electrical and
Thermal Stresses Test Apparatus
Standard: IEC60884-1 clause 12.3.11.
Application: It is used to check whether the screwless terminals can withstand
the electrical and thermal stresses occurring in normal use.
Test sample: Plugs and socket-outlets screwless terminals.
Feature: The device is easy for operating, the load current is stepless
adjustable,,the sample fixture will be manufactured according to
the standard requirements.
Technical Parameters:
| Item Name | Parameter Data |
| Input supply | Match client's local power supply conditions |
| Test cycles | 192 cycles |
| Test time | Each cycle having a duration of approximately 1 h and carried out
as follows: – the current flows for approximately 30 min; – for a further period of approximately 30 min no current flows. |
| Test current | AC 1~99.9A±(3%±1A) |
| Voltage drop measurement range | 0~199.9±(3%±1mv) |
Test processes:
Screwless terminals shall withstand the electrical and thermal
stresses occurring in normal use.
Compliance is checked by the following tests a) and b), which are
carried out on five screwless terminals of socket-outlets which
have not been used for any other test.
Both tests are carried out with new copper conductors.
a) The test is carried out loading the screwless terminals for 1 h
with an alternating current as specified in table 10 and connecting
rigid solid conductors 1 m long having the nominal cross-sectional
area as specified in the same table.
The test is carried out on each clamping unit.
During the test the current is not passed through the
socket-outlet, but only through the terminals.
Immediately after this period, the voltage drop across each
screwless terminal is measured with rated current flowing.
In no case shall the voltage drop exceed 15 mV.
The measurements are made across each screwless terminal and as
near as possible to the place of contact.
If the back connection of the terminal is not accessible, the
specimens may be adequately prepared by the manufacturer; care
shall be taken not to affect the behaviour of the terminals.
Care shall be taken to ensure that, during the period of the test,
including the measurements, the conductors and the measurement
devices are not moved noticeably.
b) The screwless terminals already subjected to the determination
of the voltage drop specified in the previous test a) are tested as
follows.
During the test, a current equal to the test current value given in
table 10 is passed.
The whole test arrangement, including the conductors, shall not be
moved until the measurements of the voltage drop have been
completed.
The terminals are subjected to 192 temperature cycles, each cycle
having a duration of approximately 1 h and carried out as follows:
– the current flows for approximately 30 min;
– for a further period of approximately 30 min no current flows.
The voltage drop in each screwless terminal is determined as
prescribed for the test of a) after every 24 temperature cycles and
after the 192 temperature cycles have been completed.
In no case shall the voltage drop exceed 22,5 mV or twice the value
measured after the 24th cycle, whichever is the smaller.
After this test an inspection by normal or corrected vision without
additional magnification shall show no changes evidently impairing
further use such as cracks, deformations or the like.
