Northern Connectors Harting HAN Industrial Rectangular Connectors - Manual (Page 29)

Han
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Electrical engineering data
Pollution degree
The dimensioning of operating equipment is dependent on envi-
ronmental conditions. Any pollution or contamination may give rise
to conductivity that, in combination with moisture, may affect the
insulating properties of the surface on which it is deposited. The
pollution degree influences the design of components in terms of
the creepage distance.
The pollution degree is defined for exposed, unprotected insula-
tion on the basis of environmental conditions.
HARTING heavy duty Han connectors are designed as stand-
ard for Pollution Degree 3.
Pollution degree 1
in air-conditioned or clean, dry rooms, such as computer and
measuring instrument rooms, for example.
Pollution degree 2
in residential, sales and other business premises, precision en-
gineering workshops, laboratories, testing bays, rooms used for
medical purposes. As a result of occasional moisture condensa-
tion, it is to be anticipated that pollution/contamination may be tem-
porarily conductive.
Pollution degree 3
in industrial, commercial and agricultural premises, unheated
storage premises, workshops or boiler rooms, also for the
electrical components of assembly or mounting equipment
and machine tools.
Pollution degree 4
in outdoor or exterior areas such as equipment mounted on the
roofs of locomotives or tramcars.
Extract from DIN EN 60 664-1 (VDE 0110-1),
Para. 4.6.2
Pollution degree 1: No pollution or only dry, non-conductive
pollution occurs. The pollution has no influence.
Pollution degree 2: Only non-conductive pollution occurs except
that occasionally a temporary conductivity caused by condensa-
tion is to be excepted.
Pollution degree 3: Conductive pollution occurs or dry non-
conductive pollution occurs which becomes conductive due to
condensation which is to be expected.
Pollution degree 4: Continuous conductivity occurs due to con-
ductive dust, rain or other wet conditions.
Special ruling for connectors
Subject to compliance with certain preconditions, the stand-
ard for connectors permits a lower pollution degree than that
which applies to the installation as a whole. This means that
in a pollution degree 3 environment, connectors may be used
which are electrically rated for pollution degree 2.
The basis for this is contained in DIN EN 61 984, Para.
6.19.2.3.
Extract form DIN EN 61 984, Para. 6.19.2.3
For a connector with a degree of protection IP 54 or higher
according to IEC 60 529 the insulating parts inside the enclosure
may be dimensioned for a lower pollution degree.
This also applies to mated connectors where enclosure is ensured
by the connector housing and which may only be disengaged for
test and maintenance purposes.
The conditions fulfills,
● a connector which is protected to at least IP 54 as per IEC
60 529,
● a connector which is installed in a housing and which as
described in the standard is disconnected for testing and main-
tenance purposes only,
● a connector which is installed in a housing and which when
disconnected is protected by a cap or cover to at least IP 54,
● a connector located inside a switching cabinet to at least IP 54.
These conditions do not extend to connectors which when dis-
connected remain exposed to the industrial atmosphere for an
indefinite period.
It should be noted that pollution can affect a connector from the
inside of an installation outwards.
Typical applications in which to choose pollution
degree 2 connectors:
● A connector serving a drive motor which is disconnected only for
the purpose of replacing a defective motor, even when the plant
or system otherwise calls for pollution degree 3.
● Connectors serving a machine of modular design which are dis-
connected for transport purposes only and enable rapid erection
and reliable commissioning. In transit, protective covers or ad-
equate packing must be provided to ensure that the connectors
are not affected by pollution/contamination.
● Connectors located inside a switching cabinet to IP 54. In such
cases, it is even possible to dispense with the IP 54 housings of
the connectors themselves.
Specifying electrical data
Electrical data for connectors are specified as per DIN EN
61 984.
This example identifies a connector suitable for use in an unearthed
power system or earthed delta circuit (see page 00.22, Table B2 of
DIN EN 60 664-1):
16 A 400 V 6 kV 3
Working current
Working voltage
Rated impulse voltage
Pollution degree
This example identifies a connector suitable exclusively
for use in earthed power systems (see page 00.22, Table B2 of
DIN EN 60 664-1):
10 A 230/400 V 4 kV 3
Working current
Working voltage conductor – ground
Working voltage conductor – conductor
Rated impulse voltage
Pollution degree