Apparatus intrinsically safe

This certificate is issued for the electrical apparatus Intrinsically Safe Field Bus System RS 485... [Pg.406]

Specifications for intrinsically safe electrical system i General recommendations on the selection of the appropriate group of electrical apparatus based on safe gaps and minimum igniting currents 3682/1991 BS 5501-7/1977 BS 5501-9/1982 BS 5345-1/1989 ... [Pg.192]

The design of intrinsically safe equipment is governed by the rules of NFPA Publication No. 493, Standard for Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous Locations. It is cautioned, however, that the design of intrinsical-... [Pg.523]

Standard for Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, IE and III, Division 1 Hazardous Locations... [Pg.551]

Intrinsically Safe Systems. Intrinsically safe apparatus and wiring shall be permitted in any hazardous (classified) location for which it is approved, and the same provisions of Articles 501 through 503, 505, and 510 through 516 shall not be considered applicable to such installations, except as required by Article 504. [Pg.637]

Installation of intrinsically safe apparatus and wiring shall be in accordance with the requirements of Article 504. [Pg.637]

Specify intrinsically safe equipment, or total enclosure, or non-sparking apparatus. [Pg.367]

Circuits Not Device. During design, when considering the use of intrinsically safe electrical circuits, the whole electrical circuit must be considered. It is not enough just to consider the electrical apparatus employed in the hazardous environment. Consideration must be given to its associated apparatus located in the non-hazardous area. Therefore, it is not just the apparatuses which must be considered, but the whole circuit, both in the hazardous area and the non-hazardous area. [Pg.260]

Another kind of electrical equipment suitable for use in hazardous locations is equipment whose maximum possible energy output is insufficient to ignite the hazardous material. The electrical input to this equipment must be controlled by a specially designed electrical barrier. Such electrical equipment must be compatible. ANSI/UL913 defines low energy intrinsically safe electrical equipment and associated apparatus permitted in Division 1 areas. Nonincendive electrical equipment is permitted in Division 2 locations. Table 7-6 describes intrinsically safe and nonincendive equipment and identifies permitted uses. [Pg.162]

Until 1999, there exists no international standard for explosion protected electrical apparatus intended for the application in zone 0. Intrinsically safe circuits according to IEG 60079-11 and EN 50020, category ia, seemed to be an appropriate type of protection for zone 0 for some time. In the same way, for coal mines the first international standard describing the requirements for electrical apparatus that are intended for operation in the presence of methane/coal dust-air mixtures was prepared in 2000. [Pg.36]

Part 3 Spark test apparatus for intrinsically safe circuits... [Pg.87]

Firedamp-proof apparatus, type of protection intrinsic safety, according to IEC 60079-11 and/or EN 50020, are not subjected to any classification with respect to MIC or MIC/MIC (CH4) ratio it is MIC/MIC (CH4) =1 in this case. Intrinsic safety covers two categories of intrinsically safe circuits ... [Pg.104]

II Explosion protected with subgroups IIA/IIB/IIC for flameproof and/ or intrinsically safe apparatus... [Pg.110]

If an intrinsically safe apparatus is intended for operating on its own (installed in zone 1, not including non-intrinsically safe circuits), the marking... [Pg.111]

Electrical apparatus with combined non-intrinsically safe and intrinsically safe components, e.g. a flameproof enclosure with a power supply for intrinsically safe circuits, with a 690 V input, terminal boxes in increased safety, is considered as an associated apparatus (from the intrinsic point of view). In this case, the abbreviation for intrinsic safety is put in brackets ... [Pg.111]

If the apparatus with intrinsically safe circuits is installed outside a hazardous area, e.g. in a control room in a chemical plant, the marking inserts Ex or EEx and the type of protection in brackets ... [Pg.111]

In this case the apparatus is not subjected to the temperature classification T1...T6 because of its safe environment. For Group II intrinsically safe circuits, the MESG or MIC grouping IIA/IIB/IIC shall be marked according to the relevant standards (IEC 60079-11, EN 50020). [Pg.111]

In intrinsically safe circuits, the electric values shall be limited to ensure the correct operation of intrinsic safety. This refers obviously to voltages and currents, but in addition to energy storage elements, capacitances and inductances, e.g. in cables, or as internal values typical for the apparatus referred to... [Pg.114]

Figure 6.10 shows a typical example for a q-apparatus. It is a power supply for intrinsically safe electric circuits to be installed in zone 1 (and zone 2). The power input (at 24 V AC/DC level) is fed via flameproof plug-and-socket connectors to the apparatus. So, the power supply can be replaced under load without conflicting with the requirements of explosion protection. [Pg.134]

Classification and marking of intrinsically safe apparatus concerning explosion groups (I, IIA, IIB, IIC) and temperature classes (T1-T6) are organized in the same way as for, e.g., flameproof enclosure - d (see Tables 4.1 and 4.2, Chapter 4, and Chapter 5 for marking). Some special features, however, which are of importance for type of protection intrinsic safety - i only, will be explained in the following. [Pg.362]

Intrinsically safe apparatus is designed for use or installation in a potentially explosive gas atmosphere. [Pg.362]

Associated apparatus is commonly installed in a safe area. Many applications of intrinsic safety in remote control and monitoring instrumentation are assembled in such a way that an intrinsically safe apparatus, e.g. a sensor or actuator in the hazardous area, is connected with an associated apparatus, e.g. a safety barrier or an Ex i-isolator in the safe area (see Fig. 6.196). With that, the associated apparatus takes over the function to safely limit current and voltage in the intrinsically safe circuit to permissible values. [Pg.363]

The classification of intrinsically safe apparatus as described above according to ... [Pg.364]

Moreover, the marking of intrinsically safe apparatus contains further information as follows ... [Pg.365]

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