
37
Installing Equipment
Installing Electrical Connections
— Electrical wiring is only to be laid and connected by an expert paying attention to
the pertinent laws and regulations.
— All connections are established on terminals at the rear of the device rack.
— Connect the device rack to a central terminal strip using flexible cables.
●
Protect cables against tensile stress using the tie bands provided.
●
The wiring must conform to the national regulations (separation of mains, low-
voltage and control voltage circuit).
●
Connect shielding to earth of rack system or panel.
Connection between Sensing Heads Polytron SE Ex PR M or SE Ex LC M and
Device Rack
●
With shielded 3-core cable (braided screen, cover
≥
80 %).
●
Outer diameter max. 12 mm.
●
Connect shielding as short as possible to earth terminal of rack system or panel.
●
By means of the connecting cone within the cable gland the cable-screen has to
be contacted to the internal conductive surface of the enclosure as shown. With
this the required RF-immunity according to 89/336/EEC is ensured.
Remarks about the cable gland
The cable gland is intended to be used for fixed installations only and suitable for
cable diameters from 7 up to 12 mm.
Connection between Sensing Head Polytron SE Ex HT M and Device Rack
●
With shielded 3-core cable (braided screen, cover
≥
80 %).
●
Outer diameter max. 12 mm.
●
Connect shielding to earth terminal of the rack system or panel only if the enclos-
ure of the sensing head is not earthed at site (by means of the internal PE-terminal
clamp).
∼
12 mm
∼
45 mm
a
b
c
d
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7_06.eps
Содержание SE Ex HT M
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