bus instruction

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PCIB-1012C 7/26/89 INSTRUCTION BOOK BUS SYSTEMS MEDIUM-VOLTAGE SWITCHGEAR AND BUS DUCT IN ADDITION TO THE PERSONNEL PROTECITON PRECATUIONS AS OUTLINED ON PAGE i, REFER TO ANSI STANDARD Z 244.1-1982 ENTITLED: PERSONNEL PROTECTION LOCKOUT/TAGOUT OF ENERGY SOURCES MINIMUM SAFETY REQURIEMENTS ANSI C37.20.2 - 1987 6.2.3 INSULATI NG MATERLALS FOR COVERI NG BUSES AND CONNECTIONS The insulating system for power-carrying conductors and connections shall be rated in accordance with Table I and shall withstand the tests in 5.2.l. Each conductor shall have an insulating* covering that by itself will withstand the maximum rated line-to-line voltage between the conductor and outside surface of the insulating covering for a period of one minute. This insulating covering is a requirement of metalclad switchgear (see 2.13.1) and is provided to minimize the possibility of communicating faults and to prevent development of bus faults which w ould result if foreign objects momentarily contacted bare bus. This insulating covering is usually only a part of the primary insulating system and in such cases the outer surface of this insulating covering will not be at ground potential. It should not be assumed, therefore that personnel can contact this insulating covering with complete safety. Where possible, joints shall be completely covered by insulated material at the factory. For interconnecting bus joints which must be made in the field, insulating material shall be supplied for application in accordance with the switchgear manufacturer's instructions. Insulating material for line and load terminations may not be furnished as standard. Insulating materials for buses and connections shall be flame resistant. These instructions may not cover all details or variations in equipment, nor provide for every possible contingency to be met. Should further informatio n be desired or should specific problems arise which are not covered sufficiently the matter should be referred to the POWERCON CORPORATION. *Insulation for Metal-Enclosed Switchgear may be air or if specified the same covering as specified for Metalclad Switchgear. (Note by Powercon Corporation).

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