IEEE P384-D2-2018 pdf download – Draft Standard Criteria for Independence of Class 1E Equipment and Circuits

02-23-2022 comment

IEEE P384-D2-2018 pdf download – Draft Standard Criteria for Independence of Class 1E Equipment and Circuits.
flame retardant: Capable of limiting the propagation of a fire beyond the area of infuence of the energy source that initiated the fire. FLEX: Diverse and flexible mitigation strategies that increase defense-in-depth for beyond-design-basis external events to address an extended loss of alternating current power and loss of normal access to the ultimate heat sink. independence: The state in which there is no mechanism by which any single design basis event, such as a flood, can cause redundant equipment to be inoperable. isolation device: A device in a circuit that prevents malfunctions in one section of a circuit from causing unacceptable influences in other sections of the circuit or other circuits. maximum credible voltage or current transient: That voltage or current transient that may exist in circuits,as determined by test or analysis, taking into consideration the circuit location, routing, and interconnections combined with failures that the circuits may credibly experience. raceway: Any channel that is designed and used expressly for supporting or enclosing wires, cable, or bus . bars. Raceways consist primarily of, but are not restricted to, cable trays and conduits. redundant equipment or system: Equipment or system that duplicates the essential function of another piece of equipment or system to the extent that either may perform the required function regardless of the state of operation or failure of the other. safety class structures: Structures designed to protect Class 1E equipment against the effects of the design basis events. Separate safety class structures can be separate rooms in the same building. The rooms may share a common wall.
5.1.3 Nonhazard area The minimum separation distances used for these areas are based on hazards being limited to failures or faults internal to the electrical equipment or cables. Area designation An area meeting the following requirements may be designated as a nonhazard area (previously called the cable spreading room). a) The area shall not contain high energy equipment such as switchgear, transformers, rotating equipment, or potential sources of missiles or pipe failure hazards, or fire hazards. b) Circuits in the area shall be limited to those with control and instrument functions and those power supply circuit cables and equipment serving the equipment located within the area. c) Power circuit cables in this area shall be installed in enclosed raceways. d) Administrative control of operations and maintenance activities shall control and limit introduction of potential hazards into the area. Refer to IEEE Std 690 for definitions of power, control, and instrumentation cables.

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