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IEC 60950-1 (ed.1)
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Report No. 98323
4.7.201
Add the following after Clause 4.7.3.6:
4.7.201 Resistance to fire – Alternative tests
4.7.201.1 General
Parts of non-metallic material shall be resistant to
ignition and spread of fire.
ignition and spread of fire.
This requirement does not apply to decorative
trims, knobs and other parts unlikely to be ignited
or to propagate flames originating from inside the
apparatus, or the following:
trims, knobs and other parts unlikely to be ignited
or to propagate flames originating from inside the
apparatus, or the following:
a) Components that are contained in an enclosure
having a flammability category of FV-0 according
to AS/NZS 4695.707 and having openings only for
the connecting wires filling the openings
completely, and for ventilation not exceeding 1
mm in width regardless of length.
having a flammability category of FV-0 according
to AS/NZS 4695.707 and having openings only for
the connecting wires filling the openings
completely, and for ventilation not exceeding 1
mm in width regardless of length.
b) The following parts which would contribute
negligible fuel to a fire:
negligible fuel to a fire:
- small mechanical parts, the mass of which does
not exceed 4 g, such as mounting parts, gears,
cams, belts and bearings;
not exceed 4 g, such as mounting parts, gears,
cams, belts and bearings;
- small electrical components, such as capacitors
with a volume not exceeding 1750mm
with a volume not exceeding 1750mm
3
, integrated
circuits, transistors and optocoupler packages, if
these components are mounted on material of
flammability category FV-1, or better, according to
AS/NZS 4695.707.
these components are mounted on material of
flammability category FV-1, or better, according to
AS/NZS 4695.707.
NOTE: In considering how to minimize propagation of
fire and what ‘small parts’ are, account should be taken
of the cumulative effect of small parts adjacent to each
other for the possible effect of propagating fire from one
part to another.
fire and what ‘small parts’ are, account should be taken
of the cumulative effect of small parts adjacent to each
other for the possible effect of propagating fire from one
part to another.
Compliance shall be checked by the tests of
4.7.201.2, 4.7.201.3, 4.7.201.4 and 4.7.201.5.
4.7.201.2, 4.7.201.3, 4.7.201.4 and 4.7.201.5.
For the base material of printed boards,
compliance shall be checked by the test of
4.7.201.5.
compliance shall be checked by the test of
4.7.201.5.
The tests shall be carried out on parts of non-
metallic material which have been removed from
the apparatus. When the glow-wire test is carried
out, the parts shall be placed in the same
orientation as they would be in normal use.
metallic material which have been removed from
the apparatus. When the glow-wire test is carried
out, the parts shall be placed in the same
orientation as they would be in normal use.
These tests are not carried out on internal wiring.
4.7.201.2 Testing of non-metallic materials
Parts of non-metallic material shall be subject to
the glow-wire test of AS/NZS 60695.2.11 which
shall be carried out at 550°C.
the glow-wire test of AS/NZS 60695.2.11 which
shall be carried out at 550°C.
All materials have suitable flame
class, no testing required.
class, no testing required.
P
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