BEKA BA377NE, Manual

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2.8 Certification label information
The BA377NE product certification label is fitted in a
recess on the top outer surface of the enclosure. It
shows the ATEX and IECEx certification information
plus BEKA associates name and location and the
instrument serial number.
Certification information
from other authorities may also be included.
BA377NE Certification information label
3. SYSTEM DESIGN FOR HAZARDOUS AREAS
When correctly installed in Zone 2 the BA377NE
Timer or Clock may be connected to almost any
apparatus in the safe area and to Ex n, Ex e, Ex p
and Ex d protected apparatus located in Zone 2.
Because the BA377NE is not certified intrinsically
safe it should not be connected to an intrinsically
safe system.
BEKA Application Guide AG310, Guide for
Installation of [extra low voltage d.c.] Ex nA
instrumentation
, which can be downloaded from
www.beka.co.uk, contains explanations and
recommendations for the installation of Ex nA
equipment.
In addition to being able to be connected to other
equipment in the safe area and in Zone 2, the
BA377NE may also be connected to suitably
protected and certified equipment located in Zone 1.
This is illustrated in Fig 4 and explained in
Application Guide AG310.
There are four design requirements:
1. The BA377NE must be installed in a panel
enclosure complying with the requirements for
Ex n protection as shown in section 4 of this
manual.
2. The BA377NE should be powered from a
circuit that has output safety parameters in
normal operation equal to, or less than, the
input safety parameters for terminals 1 and
2 specified by the BA377NE
ATEX Type
Examination Certificate.
3. Hazardous area apparatus to which the
BA377NE is connected should be protected
by a technique suitable for the Zone in
which the equipment is located such as Ex n
or Ex e if located in Zone 2.
Equipment
protected by intrinsic safety should not be
connected to a BA377NE.
4. Wiring should comply with Clause 9 of
EN 60079-14.
When designing a system it is important to
remember that terminals 2, 6 and RS2 are
interconnected within the BA377NE.
See Figs 7 & 11.