B.1 North American Classification of Hazardous Locations, Continued
Entity Concept |
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| Under entity requirements, the concept allows interconnection of | |||
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| intrinsically safe apparatus to associated apparatus, not specifically | |||
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| examined in such combination. The criteria for interconnection is that the | |||
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| voltage (Vmax ) and current (Imax ), which intrinsically safe apparatus | |||
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| can receive and remain intrinsically safe, considering faults, must be | |||
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| equal to or greater than the voltage (Voc or Vt ) and current (Isc or It ) | |||
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| levels which can be delivered by the associated apparatus, considering | |||
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| faults and applicable factors. In addition, the maximum unprotected | |||
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| capacitance (Ci ) and inductance (Li ) of the intrinsically safe apparatus, | |||
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| including interconnecting wiring, must be less than or equal to the | |||
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| capacitance (Ca ) and inductance (La ) which can be safely connected to | |||
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| the associated apparatus. If these criteria are met, then the combination | |||
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| may be connected and remain intrinsically safe. Both FMRC and CSA d | |||
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| entity parameters are defined in Table | |||
| Table | Factory Mutual (FM) Approval | ||||
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| Code |
| Description |
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| 1C |
| Explosionproof for Class I, Division 1, Groups A, B, C & D. |
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| Suitable for Class III, Division 1. Conduit seals required within |
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| 18” of enclosure, Group A only. |
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| Intrinsically Safe for use in Class I, Division 1, Groups A, B, C |
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| & D; Class II, Division 1, Groups E, F & G; Class III, Division 1, |
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| T4 at 40°C, T3A at 93°C maximum ambient, when connected |
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| in accordance with Honeywell drawing 51204241. |
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| Nonincendive for use in Class I, Division 2, Groups A, B, C & |
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| D; Suitable for Classes II & III, Division 2, Groups F & G, T4 at |
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| 93°C maximum ambient, hazardous locations. 42 Vdc max. |
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| Environmental: Indoor and outdoor hazardous locations |
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| (NEMA 4X). |
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| Continued on next page | |
2/05 | ST 3000 Release 300 Installation Guide | 87 |