MARINE RADIO CO.,LTD.
주/선박무선
Subject : Auto Exchanger Page : (17 / 46)
Date : 2010.10.13 Doc. : MCX-5000S_ENG_R1
(QAS-ADD-008/1/10.10.13) manual\pabx\mcx-5000S\MCX-5000S_eng.doc
(
MARINE RADIO CO., LTD.)
MRC
2.9 Connection diagram among I.S. barrier box (BB-922), telephones and peripheral devices.
This telephone system is designed for intrinsically safe construction and proper ignition grade(IIC
T6) so that it can be communicated in hazardous area where gas can be exploded.
In order to be intrinsically safe, energy and energy storage must be constrained to “safe” levels in
hazardous area apparatus. Wiring inherently has capacitance formed by a dielectric material between
two conductors.
2.9.1 Wiring concept diagram
2.9.2 Detail connection wiring of the I.S. telephone
The A/T barrier box BB-922 is placed in a non-hazardous area up to one 300-meter from the phone,
limiting the energy levels going to the hazardous area to conform to intrinsically-safe requirements.
Where multiple I.S. telephone wires are routed together, shielded cable should be used. The use of
shielded cable prevents cross-talk from occurring between multiple I.S. telephone circuits. The shield
must be grounded to an I.S. ground and connected only at the barrier box.
Typical intrinsically-safe installation
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