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9 Notes for Intrinsically Safe Installation
9.1
HAZARDOUS LOCATION
Refer to the device label for the description of the environment in which the device
may be installed.
9.2
FIELD WIRING
Intrinsically Safe wiring must be made with grounded shielded cable or installed in
grounded metal conduit. The electrical circuit in the hazardous area must be
capable of withstanding an A.C. test voltage of 500 volts R.M.S. to earth or frame of
the apparatus for 1 minute. Installation must be in accordance with Masoneilan
guidelines. The installation including the barrier earthing requirements must comply
with the installation requirements of the country of use.
Factory Mutual requirements (USA): ANSI/ISA RP12.6 (Installation of Intrinsically
Safe Systems for Hazardous (Classified) Locations) and the National Electrical
Code, ANSI/NFPA 70. Division 2 installations must be installed per the National
Electrical Code, ANSI/NFPA 70. See also, note 4.
CSA requirements (Canada): Canadian Electrical Code Part 1. Division 2
installations must be installed per the Canadian Electrical Code Division 2 Wiring
Methods. See also note 4.
ATEX requirements (EU): Intrinsically safe installations must be installed per
EN60079-10 and EN60079-14 as they apply to the specific category.
9.3
SVI-II AP (+) and (-) 4-20 mA IN Terminals
These terminals power the SVI-II AP. The barrier is the Controller Output Type, for
example MTL 728.
Entity Parameters: Vmax= 30 Vdc; Imax=125 mA; Ci = 6.5 nF; Li = 1 uH; Pmax =
900 mW
9.4
SVI-II AP (+) and (-) 4-20mA OUT Terminals
These terminals provide a 4 to 20 mA signal related to valve position. The 4 to 20
OUT terminals behave much like the terminals of a transmitter so a Transmitter type
barrier with 250 Ohm series resistance (internal or external) is used for this
connection. For example, MTL 788 or 788R.
Use of the 4-20 OUT feature is certified to ATEX intrinsically safe requirements and
is approved for use in Zone 0. Use of the 4-20 mA OUT feature has not been
certified by FM or CSA. The 4-20 mA OUT feature may not be used in an
intrinsically safe installation when FM or CSA intrinsically safe approval is required.
The 4-20 mA OUT feature is certified by FM and CSA for use in a DIV 2 area and in
a DIV 1 area when the SVI2 is installed in accordance with flameproof requirements.
Entity Parameters:
Vmax = 30 Vdc; Imax = 125 mA; Ci = 8 nF; Li = 1 uH max = 900 mW.
ES-699 Rev AA
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78 | =GE Oil & Gas
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