Release 1 34-ST-25-19 RMA 3000 Remote Meter Assemblies User Manual 37
6/04
Entity Concept
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 ) o
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 Tables 6 and 7.
Table 6 Factory Mutual (FM) Approval
Code Description
1C Explosion-proof for Class I, Division 1, Groups A, B, C & D. Dust
Ignition-proof 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.
Non-incendive 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).
Intrinsic Safety
Entity Parameters
(1)
Class I, II, III, Divisions 1 and 2,
Groups A - G
V
Max
≤
42.4 V
I
Max
= 225 mA
P
Max
= 1.2 W
C
i
= 4.2 nF
L
i
= 0 With no integral indicator, or with
integral Smart Meter, option SM.
L
i
=
150 µH
With Analog Meter, option ME.
(1)
Install in accordance with Honeywell drawing 51204241.
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