The ELEKTRO
1/2013
Customer Information for Electro-technical Specialists
Why doesn‘t the system
operate? The distributor
has already got
IP 65!
Collection of new ideas in the Electrotechnical Industry
Dear Reader,
our years of experience related to
electrical installation and distribution systems in demanding environments provide us and our clients
always a great challenge.
This depends certainly on the fact
that you automatically assume that
Hensel products prove themselves
in difficult environmental conditions
and the installed devices will work
without difficulties - not only indoors
but also in outdoor installations. This
confidence honors us and encourages us to look for better and safer
solutions!
This includes not only an excellent
enclosure quality, but also the necessary system accessories that are
essential for long-lasting operating
functions. This is supported by an
intelligent selection table for rapid
decision making.
We look forward to a fruitful and a
challenging cooperation with you.
Sincerely
Felix G. Hensel
Managing partner of
Gustav Hensel GmbH & Co. KG
Are super-tight enclosures
safe to operate outdoors?
Operation of switching devices in outdoor
installations
No electrical equipment and
switching device can be used outdoors without protection. Enclosures protect electrical equipment
against external influences. Thereby the installed device determines
the minimum requirements for the
enclosure.
For a continuous and troublefree
operation the special climatic influences and effects on the equipment are to be considered in addition to the requirements for indoor
installations.
How must an enclosure be constructed for the
operation of electrical devices in outdoor installations?
Operation of switching devices in outdoor installations:
What outdoor influences cause any effect and what
requirements are to be considered?
Basically, the general requirements apply
as for indoor installations, for example as
the protection against electric shock is regarded.
When installed outdoors, however, additional requirements must be observed.
Switching devices, this includes for example switches, terminals, fuses and transformers, are generally not suitable for unprotected outdoor installation. Their rating
is dependent on the ambient conditions.
moisture, reduce the electrical insulation
properties of the devices.
Weather and environmental influences,
therefore, require the protection of switching devices by a housing.
Possible contamination, combined with
Minimum requirements
for enclosure
here: to protect the MCB against
external influences
Weather-related
or
ambient influences
Characteristic feature
of the switching device,
for example miniature circuit breaker
Dust
Pollution degree 2
„It occurs only non-conductive pollution. However a temporary conductivity
caused by condensation must be
expected.“
Protection of the housing must be so
high that the permissible pollution of
the switching device is not exceeded;
IP 2X
protection against ingress of solid
foreign objects
≥ 12.5 mm Ø
≥ IP 4X
Protection against ingress of solid
foreign objects ≥ 1 mm Ø
foreign bodies (f.example insects)
Water: Rain/snow
IP X0
no protection
here: at least IP 5X
(Minimum requirements of DIN VDE 0100 Part 737)
≥ IP X3
Protection against ingress of water
(Min. requirements of DIN VDE 0100 Part 737)
suitable for harsh environment and/or
outdoor installation
(Follow manufacturer‘s instructions)
Sun: UV radiation
No specification,
as devices are not tested
for UV resistance
UV resistant material
(Follow manufacturer‘s instructions)
max. 55° C
ambient temperature
at switching device
Any heat that is generated needs
to be effectively dissipated,
ventilate housing, if necessary,
or choose larger housing
max. -5° C
ambient temperature
at switching device
Cold-resistant material,
housing may be heated
93 % at 40 °C
20 % at 55 °C
according to DIN 40046
Reduce condensation,
ventilation by pressure compensation
or heating
Sun: Heat
Frost/cold
Humidity (condensation)
Weather and environmental influences determine the selection of an enclosure,
regarding the switching devices to be installed!
Enclosures properly selected for operating switching devices outdoors:
This protection may be ineffective if the
equipment is exposed to condensation
or if it produces the pollution itself under
normal operating conditions.
Pollution caused by water deposits,
soot, metal or coal dust is always conductive.
Not only the immediate vicinity of a
switching device, the installation also determines the amount of pollution such as
conductive dust and humidity and thus
influences the creepage distances.
Under the influence of moisture, contamination is conductive.
The pollution of the switching device
can be reduced , by the use of housings
(enclosures), encapsulation or hermetic
seals.
Switching devices
Pollution degree specified
by the manufacturer
Pollution degree 2
Pollution degree 3
(specified by the manufacturer)
(specified by the manufacturer)
”It only occurs non-conductive pollution.
Sometimes a temporary conductivity caused by
condensation must however be expected“
DIN VDE 0110-1
”Conductive pollution occurs or dry non-conductive pollution which becomes conductive due to
expected condensation.“
DIN VDE 0110-1
Required protection provided by enclosures for compliance
with the degree of pollution:
Required protection provided by enclosures to comply with the pollution
degree according to DIN VDE 0100-737 at least:
≥ IP 5X ≥ IP 4X
protection against the ingress of foreign bodies (dust) and
protection against solid bodies larger than 1mm and
≥ IP X3 protection against ingress of water with harmful effects
(Minimum requirements of DIN VDE 0100 Part 737)
≥ IP X3 protection against ingress of water with harmful effects
(Minimum requirements of DIN VDE 0100 Part 737)
Enclosure at least degree of protection IP 53
Enclosure at least degree of protection IP 43
Additional
measures for heat NO
dissipation are
NOT required
< -5°C
Ambient temperature at
the switching
device
NO
YES
Choose larger
YES enclosure for
improved heat
dissipation
> 55°C
Ambient temperature at
the switching
device
No venting to
prevent illegal reduction of degree
of protection.
Changes
in temperature
or high power
dissi­pation?
NO
Additional
measures for heat
dissipation are
NOT required
< -5°C
Ambient temperature at
the switching
device
YES
≥ IP 53
+ heating
—
Conclusion:
—
YES
ventilation for
better heat
dissipation
< -5°C
YES Ambient temperature at
the switching
device
NO
YES
additional
heating
≥ IP 53
> 55°C
Ambient temperature at
the switching
device
Changes
NO
in temperature
or high power
dissi­pation?
NO
YES
additional
heating
—
NO
additional
heating
IP 43
IP 43
IP 43
IP 43
+ heating
—
+ heating
—
+ ventilation /
pressure compensation
+ ventilation /
pressure compensation
—
—
The safe operation of a switching device in outdoor installations requires enclosure systems
and system accessories for additional measures in order to counteract effects of the weather.
Combinable
enclosure system, insulation-enclosed,
total insulated, degree of protection IP 65,
for the assembly of power switchgear and controlgear
assemblies (PSC) up to 630 A
in accordance with IEC 61 439 Part 2
durability for outdoor installation:
temperature resistant -40° C up to + 120° C,
UV resistant
KV Small-type distribution
boards up to 63 A,
3 to 54 modules, IP 54- 65
Material
Impact
resistant IK 08, flame retardant
Distribution boards
Combinable enclosure system
with door up to 250 A, IP 65
Mi Distribution boards
up to 630 A, IP 54-65
Pressure compensation
Combi climate glands KBM .. / KBS ..
reduce condensation that may form through rapid
temperature changes or intense sun exposure
Degree of protection IP 66 / IP 67
Ventilation
Ventilation flange Mi BF 43
for ventilation of Mi distribution boards in the event of
extremely high internal temperatures or a risk of water
condensation
Degree of protection IP 43
Cable entry systems
Construction board panels
up to 630 A, IP 44-65
Protection
Heating
Canopy Mi DB ..
offers protection against rain, snow and ice
and dust
Cabinet heater
for distributors in unheated rooms or outdoors. It should prevent the formation of condensation. In outdoor installations
also an excessive drop of the interior temperature can be
prevented.
More detailed information on this theme
Proceed to download at www.hensel.in!
Product information
ENYSUN - Safe product solutions for
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Photovoltaik distributors
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POWER.
PASSION FOR
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Product information
as at: 10/2011
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Grid, on-grid and
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GmbH & Co. KG
Gustav HenselPower Distribution Systems
Industrial Electrical
Altenhundem
6
Gustav-Hensel-Straße
t, Germany
D-57368 Lennestad
n boxes
PV Generator junctio
tors
Battery distribu
rs
Solar inverter collecto
areas of the new
For all application
(Draft)
IEC 60 364-7-712
standard
P.O. Box 1461
t, Germany
D-57344 Lennestad
23/6 09-0
Phone: +49 (0)27
23/6 00 52
Fax: +49 (0)27
l-electric.de
E-Mail: info@hense
e
www.hensel-electric.d
Delivery in India via Hensel authorized
distributor network ­spanning 130 cities and industrial centers.
Delivery in South East Asia via Hensel authorized distributor
­network in all ASEAN countries.
Sunguvachathram - Walajabad Road
4th km behind Samsung/Flextronics
Sriperumbudur - 631 604 ∙ Kanchipuram Dist, Tamil Nadu
Mi Power Distribution boards up to 630 A
Phone: +91-44-3727 0202
Fax: +91-44-3727 0200
Email: info@hensel-electric.in ∙ www.hensel.in
DK Cable junction boxes
2
1.5 to 240 mm , IP 54-67
1
R. Rajesh
Managing Director
Hensel Electric India
Pvt Ltd
info@hensel-electric.in
www.hensel.in
Hensel Electric India Pvt Ltd
Industrial Electric Power Distribution Systems
35 Kunnam Village
The solution for reliability: Mi-distributors
with system accessories permanently
protect electrical equipment outdoors.