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D-76
Merlin Gerin enclosures comply with standard EN 50298 for empty enclosures.
The sheet metal used for Merlin Gerin enclosures receives an anti-corrosion epoxy
electrophoresis treatment and a coating of a thermosetting, polyester-resin-modified
epoxy powder for colour and appearance.
This two-coat system provides excellent finish and corrosion protection.
The characteristics of this coating are much better than those of traditional epoxy
powders:
improved colour stability
wider operating temperature range.
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Mechanical properties of
enclosures
Static load on doors, wall-mount and floor-standing enclosures and cubicles
Cubicle
400 kg
Floor-standing enclosure
64 kg
Wall-mount enclosure
48 kg
Cubicle door
12 kg
Floor-standing enclosure door
4 kg
Wall-mount enclosure door
4 kg
Mechanical properties of powder
coated surfaces
Test conditions
Test piece made of 1 mm thick steel sheet, degreased, iron phosphated, final
rinsing with 100000
W
cm DI water, 15 microns of anti-corrosion
electrophoresis treatment and 35 microns of powder paint.
Adhesion (cross-hatch and pull-off)
class 0 required
(ISO 2409)
Impact strength
(1)
> 1 kg/50 cm
(ISO 6272)
Mandrel bending test
(2)
< 10 mm
(ISO 6860)
Persoz hardness
300 s
(ISO 1522)
(1)
No cracking of the paint film after dropping a weight of one kilogram on the test piece from a
height of 50 centimetres.
(2)
Film cracks over a length of 10 millimetres maximum.
Artificial ageing test on powder
coating
Test conditions:
Two tests carried out on the same 1 mm thick steel sheet test piece.
cyclical damp-heat test:
as per standard IEC 68-2-30
six 24-hour cycles at temperatures higher than 40 °C
continuous resistance to neutral salt mist:
the tests were carried out over a period of 400 hours, far more than the 48 hours
required by the standard for indoor installations
as per standard IEC 68-2-11 and ISO 7253
400 hours without blistering for normal surface on test piece
250 hours for a scratched surface.
Evaluation of corrosion as per ISO 4628:
adhesion: class
y
1
blistering: degree 1 dim.1
rusting: Ri 1
cracking: class 1
flaking imp. 1 dim. 1
propagation of corrosion under scratch with respect to the scratch axis: 3 mm max.
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Properties of metal enclosures
Additional informations
Enclosure characteristics