Fig 3 Alternative circuits for remote indication
in a hazardous area
4.3 Use in an Ex e or Ex p panel enclosure
located in Zone 1 or Zone 2.
The BA307E-SS and BA327E-SS ATEX
EC-Type Examination Certificate allows the indicators
to be installed in an Ex e IIC Gb increased safety
panel enclosure located in Zone 1 or 2, or in an Ex p
IIC Gb pressurised panel enclosure located in a Zone
1 or 2 hazardous area. The indicators remain
intrinsically safe and must be protected by a Zener
barrier or galvanic isolator as described in sections
4.1 and 4.2. When correctly installed the indicator
installation does not invalidate the certification of the
Ex p or Ex e panel enclosure.
4.3.1 Installation in an Ex e panel enclosure
within Zone 1 or Zone 2.
Installation of a BA307E-SS or BA327E-SS
indicator in an Ex e IIC Gb increased safety panel
enclosure does not invalidate the Ex e panel's
ingress and impact protection as the front of both
indicators comply with Ex e impact and ingress
requirements. Although mounted in an Ex e panel
enclosure, the BA307E-SS or BA327E-SS remains
Group II Category 1G Ex ia IIC T5 Ga intrinsically
safe apparatus so must be powered via a Zener
barrier or galvanic isolator as described in section
4.1 and 4.2 of this manual.
Some Zener barriers and galvanic isolators are
certified for mounting within a protective enclosure
located in Zone 2 which may permit them to be
mounted in the same Ex e enclosure as the
BA307E-SS or BA327E-SS indicator. Zener
barriers and galvanic isolators are not permitted in
Ex e enclosures located in Zone 1.
Fig 4 Typical installation in Ex e panel enclosure
The indicator terminals, the wiring to the indicator
and the intrinsically safe interface, if mounted
within the enclosure, should be segregated from all
other non-intrinsically safe wiring and equipment
within the panel enclosure as required by
EN 60079-11
Equipment protected by intrinsic
safety
and EN 60079-14
Electrical installations
design, selection and erection
.
7
