Loop Schematics/Nameplates
September 2013
B-5
THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE APPARATUS TO ASSOCIATED APPARATUS NOT
SPECIFICALLY EXAMINED IN SUCH COMBINATION. THE CRITERIA FOR INTERCONNECTION IS THAT THE VOLTAGE (Vmax or Ui), THE
CURRENT (Imax or Ii), AND THE POWER (Pmax or Pi) OF THE INTRINSICALLY SAFE APPARATUS MUST BE EQUAL TO OR GREATER
THAN THE VOLTAGE (Voc or Uo), AND THE CURRENT (Isc or Io), AND THE POWER (Po) DEFINED BY THE ASSOCIATED APPARATUS. IN
ADDITION, THE SUM OF THE MAX UNPROTECTED CAPACITANCE (Ci) AND MAX UNPROTECTED INDUCTANCE (Li), INCLUDING THE
INTERCONNECTING CABLING CAPACITANCE (Ccable) AND CABLING INDUCTANCE (Lcable) MUST BE LESS THAN THE ALLOWABLE
CAPACITANCE (Ca) AND INDUCTANCE (La) DEFINED BY THE ASSOCIATED APPARATUS. IF THE ABOVE CRITERIA IS MET, THEN THE
COMBINATION MAY BE CONNECTED.
Vmax or Ui Voc or Uo Imax or Ii Isc or Io Pmax or Pi Po Ci + Ccable ≤ Ca Li + Lcable ≤ La
INSTALLATION MUST BE IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE (NEC) NFPA70 AND ANSI/ISA RP12.6.01
MAXIMUM SAFE AREA VOLTAGE SHOULD NOT EXCEED 250 Vrms.
RESISTANCE BETWEEN INTRINSICALLY SAFE GROUND AND EARTH GROUND MUST BE LESS THAN ONE OHM
LOOPS MUST BE CONNECTED ACCORDING TO THE BARRIER MANUFACTURER’S INSTRUCTION
IF HAND-HELD COMMUNICATOR OR MULTIPLEXER IS USED IT MUST BE FM APPROVED WITH ENTITY PARAMETERS AND
INSTALLED PER THE MANUFACTURER’S CONTROL DRAWING
GE42819 Sheet 8, Rev. E
Figure B-8. Notes for FM Loop Schematics
Figure B-9. Typical FM Nameplate for FIELDVUE DVC6015, DVC6025, and DVC6035
B
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