Datasheet

For further information and full technical data, visit phoenixcontact.net/products
625PHOENIX CONTACT
IEC 60947-7-1/-2
Needle flame test
As far as the use of terminal blocks is
concerned, behavior in fire when in direct
contact with a source of ignition is a major
criterion. Such sources of ignition could be
electric arcs along a creepage distance, for
example. Terminal blocks must not aid or
accelerate fires and the plastics must have
self-extinguishing properties.
This fire test simulates the behavior of the
components with an external source of
ignition acting on them directly from
outside.
In the test, a naked flame fed with butane
gas is held at an edge or surface of the test
object at an angle of 45° for 10 seconds (see
figure). The behavior of the test object
without a source of ignition is then
observed.
The test is deemed to be passed:
– When the flames or glowing processes
are extinguished within 30 seconds of the
flame being removed.
– When the tracing paper beneath the test
object does not ignite due to drops of
burning substances falling down.
All Phoenix Contact terminal blocks pass
the needle flame test thanks to the high-
grade plastics used and their structural
design.
DIN 51900-2/ASTM E 1354
Heating value of the plastic
Due to experience with catastrophic
fires, technical plants are increasingly also
classified according to the amount of heat
dissipation in the case of fire. The reason for
this is to limit heat generation in relation to
the area.
Fire load
The fire load is the amount of energy
released over a particular area during
burning. The value of the fire load is usually
expressed in MJ/m
2
. The higher the calorific
value and the presence of a substance, the
greater the amount of energy released
during burning. The calorific values of
polyamides are relatively high. For this
reason, the calorific values of terminal
blocks are also increasingly included in the
fire load determination. Calorific values of
the plastics used by Phoenix Contact
according to:
DIN 51900-2:
Polyamide 66 V2 . . . . . . . . Approx. 30 MJ/kg
Polyamide 66 V0 . . . . . . . . Approx. 32 MJ/kg
ASTM E 1354:
Polyamide 66 V2 . . . . . . . . . . Approx. 22 MJ/kg
Polyamide 66 V0 . . . . . . . . . . . Approx. 24 MJ/kg
For comparison:
Heating oil . . . . . . . . . . . . . . . . Approx. 44 MJ/kg
To calculate the fire load of individual
components, the calorific value of each
polyamide must be multiplied by the weight
of the part.
Technical information
Quality tests