WIKA BGU-...I Serie Betriebsanleitung Seite 45

Note for Ex devices
Bypass magnetic switches with ignition protection type Ex
i may only be connected to certified intrinsically safe cir-
cuits in the Ex area of Zone 1. While doing so the maximum
operating data of the switch must be observed.
The national provisions for installation of intrinsically safe
control circuits must be observed. (see 9.1 Switching ca-
pacities / Electrical values)
The interior capacity and inductivity of the cables used with
regard to the downstream intrinsically safe control device
must be observed.
Only cable entries and sealing plugs with an EC type ex-
amination certificate pursuant to EN 60079-0, EN 60079-7
may be used.
They must be certified for at least the same temperature
range and IP protection as the magnetic switch. Further-
more, it is important to ensure that the thread size and
thread version complies with the respective device model
of the housing and that the screws are suitable for the con-
nection cable used. The use of single strands is not per-
mitted! In the event of non-compliance the type approval
expires.
All unnecessary openings for feeding cables must be per-
manently sealed with appropriate sealing elements verified
for explosion protection in accordance with EN 60079-7 for
Group IIC, or EN 60079-31 for Group IIIC.
KSR KUEBLER Operating instruction Bypass magnetic switch – BGU-...I
45