Page 600 - Wago_Rail-MountedTerminalBlockSystems_Volume1_2015_US.pdf

14 Tests and Testing Procedures per IEC/EN Standards (continued)

598
Environmental Tests

The following tests show how a product reacts when exposed to an aggressive environment. Frequently occurring industrial atmo-
spheres capable of influencing the long-term consistency of clamping points, are simulated in the thermal chamber for climatic
tests.

All WAGO products meet requirements for the following environmental tests:
• Temperature Cycling Test to IEC/EN 60947-7-1, IEC/EN 60998-2-2

The rated current is applied to the test specimen during temper-
ature rise and when the temperature has reached its maximum
T (°C) value; during the second half of the cycle the current is zero.
Test current No current applied Test current Voltage drop is measured every 24 cycles, and may not

85 exceed a maximum value or vary greatly. The voltage drop
Temp. of test chamber measured at the end of the 192nd cycle may not exceed 1.5
incl. temperature rise due to times the value measured after the 24th cycle. After the test, an
current 20 inspection shall show no changes impairing further product use.
n
cycles
20’ 10’ 20’ 10’
1 cycle

• Industrial Atmospheres to EN ISO 6988, IEC/EN 60068-2-42, IEC/EN 60068-2-60
Sulfur and its combustion products are particularly aggressive pollutants commonly found in industrial environments.
A test procedure simulating such corrosive conditions consists of exposing a test specimen to water condensation in variable
atmospheres containing sulfur dioxide.
A humid atmosphere is first created in a
climatic chamber by heating an aqueous
sulfur dioxide solution. After less than half
an hour, the test specimen is fully saturat-
ed by the condensing vapors and
exposed to this atmosphere for eight
hours.

After exposure to humid atmosphere, the
test specimen is subjected to dry and
cooler conditions at room temperature for
16 hours. Depending on the test severity,
the specimen is exposed to both these
conditions several times. The gas-tightness
of the clamping unit is checked by mea-
suring the voltage drop.

In other test procedures, products are
exposed to a dry corrosive gas atmo-
sphere containing, sulfide, nitrogen and
sulfur oxides or chloride gas. These tests
can be performed over a period of 4 to
21 days.