Table B-1 Factory Mutual (Fm) Approval - Honeywell ST 3000 Installation Manual

B.1 North American Classification of Hazardous
Locations,
Entity Concept
2/05
Continued
Under entity requirements, the 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 ) and current (Imax ), which intrinsically safe apparatus
can receive and remain intrinsically safe, considering faults, must be
equal to or greater than the voltage (Voc or Vt ) and current (Isc or It )
levels which can be delivered by the associated apparatus, considering
faults and applicable factors. In addition, the maximum unprotected
capacitance (Ci ) and inductance (Li ) of the intrinsically safe apparatus,
including interconnecting wiring, must be less than or equal to the
capacitance (Ca ) and inductance (La ) which can be safely connected to
the associated apparatus. If these criteria are met, then the combination
may be connected and remain intrinsically safe. Both FMRC and CSA d
entity parameters are defined in Table B-1 and B-2.
Table B-1 Factory Mutual (FM) Approval
Code
1C Explosionproof for Class I, Division 1, Groups A, B, C & D.
Dust-Ignitionproof for Class II, Division 1, Groups E, F & G.
Suitable for Class III, Division 1. Conduit seals required within
18" of enclosure, Group A only.
Intrinsically Safe for use in Class I, Division 1, Groups A, B, C
& D; Class II, Division 1, Groups E, F & G; Class III, Division 1,
T4 at 40°C, T3A at 93°C maximum ambient, when connected
in accordance with Honeywell drawing 51204241.
Nonincendive for use in Class I, Division 2, Groups A, B, C &
D; Suitable for Classes II & III, Division 2, Groups F & G, T4 at
93°C maximum ambient, hazardous locations. 42 Vdc max.
Environmental: Indoor and outdoor hazardous locations
(NEMA 4X).
ST 3000 Release 300 Installation Guide
Description
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