14
Appendix 1
FM approval for use in USA and cFM
Approval for use in Canada
A1.0 Factory Mutual Approval
For installations in the USA and Canada, the
BA304D and all accessories have FM and cFM
intrinsic safety, Class I, II and III, Divisions 1 and 2;
Class I, Zone 0 approval. They also have FM and
cFM nonincendive approval for Class I, II and III,
Division 2 and Class I, Zone 2 installations.
US installations must comply with the BEKA
associates Control Drawing CI300-27, ANSI/ISA
RP12.6 and the National Electrical Code
ANSI/NFPA70.
Canadian installations must comply with the BEKA
associates Control Drawing CI300-27 and the
Canadian Electrical Code C22.2
All the intrinsically safe circuits shown in this
instruction manual may be used for installations in
the USA and Canada, providing the Zener barriers
and galvanic isolators have the appropriate
approval and specified entity parameters.
A1.1 4/20mA input in intrinsically safe circuit
The BA304D has been evaluated under the entity
concept, and may be connected in series with any
intrinsically safe circuit having output parameters
equal to or less than:
Voc, Vt
=
32V
Isc, It
=
200mA
Po
=
1.2W
The 4/20mA input terminals have a maximum
equivalent capacitance and inductance of:
Ci
=
0.02µF
Li
=
0.01mH
These figures must be subtracted from the
maximum permissible cable capacitance and
inductance allowed for the Zener barrier or
galvanic isolator powering the loop into which the
indicator is installed.
See Figs 2 and 3.
A1.2 4/20mA input in nonincendive circuit
The BA304D is Factory Mutual approved as
nonincendive for Class I, II and III Division 2
locations, which allows both indicators to be
installed in Division 2 without the need for Zener
barriers or galvanic isolators. The maximum
supply voltage must be less than 32V and the
wiring must be nonincendive or 'Division 2
suitable'.
A1.3 Classes, Divisions, Gas Groups and
Temperature rating
The BA304D has a T4 temperature rating at a
maximum ambient temperature of 60
o
C. It has
been approved by FM for installation in the
following Divisions and Gas Groups.
Intrinsic Safety
Nonincendive
Division 1 or 2
Division 2
Class I Group A & B
Group C
Group D
Class II Group E, F & G
Class III
Zone 0, 1 or 2
Class 1 Group IIC
Group IIB
Group IIA
Class I Group A & B
Group C
Group D
Class II Groups F & G
Class III
Zone 2
Class I Group IIC
Group IIB
Group IIA
A1.4 Nonincendive applications
For nonincendive applications a Zener barrier or
galvanic isolator is not required. The wiring must
be nonincendive or 'Division 2 suitable'.
A2.0 Display backlights
The FM approval allows the BA304D to be
supplied with two different backlights. The loop
powered backlight produces green background
illumination enabling the display to be read at night
and in poor lighting conditions. No additional
power supply, IS interface or field wiring are
required, but the indicator voltage drop is
increased from 1 to 5V. Alternatively, the
separately powered backlight has a bright orange
output which enhances daylight viewing, but an
additional IS interface and field wiring are required.
