Kenco Engineering KMD Transmitter User Manual
Page 7
6B. NOTES FOR ELECTRICAL CONNECTIONS
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1.
For intrinsically safe installations, wiring shall be installed in accordance with the
country in use. Example given: Canadian Electrical Code, Part 1, National Electric
Code ANSI/NFPA 70 Article 504-30.
2.
Shielded twisted cable of 24 AWG or heavier should be used. Cable capacitance
shall be less than 30 PF per foot.
3.
Control room equipment should not use or generate more than 250 V RMS.
4.
For FMRC and CSA approved transmitters barriers must be FMRC and CSA
approved.
5.
The connection between the earth ground terminal of FMRC or CSA entity approved
safety barriers and system earth ground must be less than 1 ohm.
6.
Safety barriers are FMRC and CSA entity approved safety barriers used in an
approved configuration where transmitter Vmax is greater than barrier Voc and
transmitter Imax is greater than barrier Isc.
7.
Transmitter Ci plus total cable capacitance for each loop must not exceed barrier Ca.
transmitter Li plus total cable inductance for each loop must not exceed barrier La
(see note 10).
8.
Transmitter enclosure shall be grounded to earth ground through the provided
ground lug in the enclosure.
9.
Parameters for each loop entity:
• Vmax = 36v
• Imax = 118 mA
• Ci = 0
• Li = 200 µH
10.
HART® communicator must be connected in accordance with manufacturers’ I.S.
installation instructions (FM and CSA approved procedures must be followed).
11.
Use only NRTL listed and CSA certified dust-tight seal for Class II and Class III
hazardous locations.
12.
CSA file number is LR 81728.
13.
Do not use plugged housing entry (at top of enclosure) for termination of conduit.
14.
In high humidity areas, use a breather type conduit sealing fitting to minimize
moisture intrusion.
15.
Safety recommendations: Always follow applicable local and national electrical
codes and observe polarity when making electrical connections. Never make
electrical connections to the transmitter with power turned on. Make sure that no
wire strands are loose or sticking out of the terminal block connections, which could
short and cause a problem. Make sure that no wire strands, including shield, are in
contact with the electronic module enclosure. The electronics module enclosure is
grounded through internal circuitry and electrically isolated from the explosion proof
enclosure.