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W22Xd - Flameproof Motors (Medium and High Voltage)

W22Xd - Flameproof Motors (Medium and High Voltage)
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W22Xd - Flameproof Motors (Medium and High Voltage) - 1

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From Gas Pipelines in the harshness of the Artic Circle conditions, to Oil rigs on the hottest spots of the blustery Arabian Desert...

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Standards and General Information Product Information Mechanical Features Electrical Features Standard and Optional Features Electrical and Mechanical Data Terminal Boxes Additional Information

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Flameproof Motors www.weg.net

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W22Xd - Flameproof Motors (Medium and High Voltage) - 5

Standards and General Information Standards and Classification of Explosive Atmospheres Equipment Type of Protection and Selection General Standards Explosive Atmospheres North American Standards and Regulations

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2 | Flameproof Motors www.weg.net

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1. Standards and General Information 1.1. Explosive Atmospheres A potentially explosive atmosphere is composed of air with mixtures of gases, vapours, mists or dusts, which might be ignited under certain operating conditions. Equipment and protective systems intended for use in potentially explosive atmospheres cover a quite large range of products, including equipment used on fixed offshore platforms, in petrochemical plants, mines, flour mills and other areas where a potentially explosive atmosphere may arise. WEG has a long experience in the design and manufacturing of motors which fully...

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Standards and General Information (Cont.) 1.2.2. IECEx System The objective of the IECEx System is to facilitate international trade in equipment and services for use in explosive atmospheres, while maintaining the required level of safety. IECEx System is accepted in many countries and aims to be the world approval system for electrical equipment to be installed in potentially explosive atmospheres. The IECEx System is based on the use of International Standards, such as IEC. These Standards are dedicated to the highly specialized fields associated with the use of equipment, named Ex...

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W22Xd - Flameproof Motors (Medium and High Voltage) - 9

Standards and General Information (Cont.) Figure 1.03 - Identification marks for dust atmospheres The hazards presented by dusts are as follows: ■ The formation of a dust cloud from any source of release, including a layer or accumulation, to form an explosive dust

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Standards and General Information (Cont.) The formation of dust layers, which are not likely to form a dust cloud, but might ignite due to self-heating or exposure to hot surfaces or thermal flux and cause a fire hazard or over-heating of equipment. The ignited layer may also act as an ignition source for an explosive atmosphere. For dust layers, the nature of housekeeping assures an essential control to their thickness. For a “good” level of housekeeping, dust layers are kept to negligible thickness and the consequent risks (occurrence of explosive dust clouds from layers and fire due to...

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Standards and General Information (Cont.) III Electrical equipment intended for use in places with an explosive dust atmosphere other than mines susceptible to firedamp. The Group III is subdivided according to the nature of the explosive dust for which it is intended: • IIIA: combustible flyings • IIIB: non-conductive dust • IIIC: conductive dust Designation Protection afforded Equipment for combustible dust atmospheres, having an ‘enhanced’ level of protection, which is not a source of ignition in normal operation and which may have some additional protection to ensure that it remains...

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Standards and General Information (Cont.) Group III electrical equipment g Maximum surface temperature determined without a dust layer shall not exceed: n he maximum surface temperature class assigned; T n he layer or cloud ignition temperature of the specific T combustible dust for which it is intended. Maximum surface temperature with respect to dust layers: n he maximum surface temperature may also be T determined for a given depth of layer, TL, of dust surrounding all sides of the apparatus, unless otherwise specified in the documentation, and marked with the symbol “X” to indicate this...

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Standards and General Information (Cont.) The main characteristics of Ex d e motors are: g T erminal box components as well as connection cables must be firmly fastened (without allowing any movement); g Special terminal block/bushings to avoid arcs and sparks and higher air and surface distances between conductive parts (clearances and creepages); g Double grounding must be provided (one on the frame and the other inside the terminal box). Applications: Same as described for Ex d motors. A positive internal pressure of at least: n kPa for level of protection “ta” equipment, or 4 n 2 kPa...

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Standards and General Information (Cont.) 1.3.4.1. Selection according to Zones Two independent types of protection each meeting EPL ’Gb’ Protection of equipment and transmission systems using optical radiation Pressurized enclosures Intrinsically safe Pressurized enclosures Intrinsically safe According to IEC/EN Standards, EPL’s have been allocated to each type of protection as follows: Intrinsically safe Intrinsically safe 1.3.4.2. Selection according to Equipment Protection Level Fieldbus non-incendive concept (FNICO) Table 1.13 - EPL’s vs Zones Pressurized enclosures Energy limitation...

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Standards and General Information (Cont.) 1.3.4.4. Selection according to the ignition temperature of the gas, vapour or dust and ambient temperature The electrical equipment shall be so selected that its maximum surface temperature will not reach the ignition temperature of any gas, vapour or dust which may be present. If the marking of the electrical equipment does not include an ambient temperature range, the equipment is designed to be used within the temperature range -20°C to +40°C. If the marking of the electrical equipment includes an ambient temperature range, the equipment is...

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Standards and General Information (Cont.) 1 1.4. General Standards Beyond the particular requirements for Hazardous Areas, WEG motors are manufactured in compliance with General IEC/EN and equivalent National Standards related with construction and performance. The main applicable Standards are described below: IEC/EN 60034-1 Determination of losses and efficiency Mechanical protection Cooling method Mounting arrangements Insulation class Terminals identification and rotation Noise limits Thermal protection Starting performance Mechanical vibration limits Table 1.18 - General Standards 1.5....

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