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发表于 2010-11-24 19:14
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来自: 日本
3.61 intrinsic safety:
a type of protection in which a portion of the electrical system contains only intrinsically safe apparatus,
circuits, and wiring that is incapable of causing ignition in the surrounding atmosphere. No single device or
wiring is intrinsically safe by itself (except for battery-operated, self-contained apparatus such as portable
pagers, transceivers, gas detectors, etc., which are specifically designed as intrinsically safe self-contained
devices) but is intrinsically safe only when employed in a properly designed intrinsically safe system. This
type of protection is referred to as “i.”
NOTE — See also ASSOCIATED APPARATUS.
3.62 intrinsic safety barrier:
a component containing a network designed to limit the energy (voltage and current) available to the
protected circuit in the hazardous (classified) location under specified fault conditions.
3.63 intrinsically safe circuit:
a circuit in which any spark or thermal effect, produced either normally or in specified fault conditions, is
incapable, in the specified test conditions, of causing ignition of a given explosive atmosphere.
3.64 intrinsically safe electrical apparatus:
electrical apparatus in which all the circuits are intrinsically safe circuits.
3.65 intrinsic safety ground bus:
a grounding system that has a dedicated conductor separate from the power system so that ground
currents will not normally flow and that is reliably connected to a ground electrode.
NOTE — For further information, refer to Article 504 of NEC, or Section 10 of CSA C22.1, or ISA RP 12.6.
3.66 intrinsically safe system:
an assembly of interconnected intrinsically safe apparatus, associated apparatus, other apparatus, and
interconnecting cables in which those parts incapable of causing ignition in the surrounding atmosphere. |
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