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Text version of the page
| explosion protection | ||||||||||||||||||||||||
| 6. explosion prntfiRtinn in north america | ||||||||||||||||||||||||
| 32 | ||||||||||||||||||||||||
| 6.3 Regulations for Install | The tables in appendix 7.4 provide an overview of the constructional requirements for hazardous locations and methods of protection. | |||||||||||||||||||||||
| The National Electrical Code in the USA and the Canadian Electrical Code in Canada apply to electrical apparatus and installations for hazardous locations. These have the nature of installation regulations for electrical facilities in all locations, and refer to a number of further standards of other institutions that contain specifications for the erection and construction of suitable equipment. The methods of installation for the zone concept in accordance with the NEC are similar to the traditional Class/Division system. New to the NEC 1996 is the use of listed Metal Clad (MC) cables in addition to rigid conduit and Mineral Insulated cables in Class I, Division 1 or Zone 1. One significant advantage to the CEC is the increased possibility of using cables. In contrast to the USA, Canada has, for some time now, also permitted the use of special cables similar to the IEC steel-wire armoured cables. | ||||||||||||||||||||||||
| 6.5 Degrees of Protection provided by Enclosures | ||||||||||||||||||||||||
| As the standard IEC 60 529 defines the degrees of protection provided by enclosures, as in the USA the degrees of protection are included in the NEMA Publication No. 250 (National Electrical Manufacturing Association). These enclosure types cannot be exactly equated with the IEC enclosure classification designation since NEMA takes additional environmental influences (such as cooling lubricant, cutting coolant, corrosion, icing, hail) into account. The tables 7.5 and 7.6 in the appendix illustrate the types of protection according to both standards. | ||||||||||||||||||||||||
| Construction and Design Requirements | ||||||||||||||||||||||||
| The regulations of the National Electrical Code and the Canadian Electrical Code stipulate which apparatus and types of protection may be used in different hazardous locations. | ||||||||||||||||||||||||
| Various standards and regulations govern the construction and testing of explosion-protected electrical apparatus and installations in North America. In the USA, these are mainly the standards issued by Underwriters Laboratories Inc. (UL), Factory Mutual Research Corporation (FM) and the International Society for Measurement and Control (ISA). In Canada, those of the Canadian Standards Association (CSA) apply. | ||||||||||||||||||||||||
| R.STAHL explosion protection | ||||||||||||||||||||||||