This standard specifies the terms and definitions, technical requirements, test methods, inspection rules, markings, packaging, transportation, and storage of densely insulated busbar trunking systems (densely insulated busbar trunking) (referred to as busbar trunking). This standard applies to bus ducts with rated AC voltage not exceeding 1 000V (including 1 140V) and frequencies of 50 Hz or 60 Hz. This standard applies to bus ducts in residential areas, commercial networks, public places, agricultural and industrial buildings, or lighting bus systems provided through tapping units. This standard also applies to bus duct systems equipped with communication and/or control systems. This standard does not apply to self-contained components selected in bus duct systems, such as circuit breakers, which should comply with their own technical standards. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB 4208-2008 Degrees of Protection Provided by Enclosures (IP Code) GB 7251.1-2005 Low-voltage Switchgear and Control Equipment - Part 1: Type Tests and Partial Type Tests - Complete Equipment GB 7251.2-2006 Low-voltage Switchgear and Control Equipment - Part 2: Protection for Busbar Trunk Systems (Bus Ducts) The special requirements of JB/T 3085 Product Packaging and Transportation Regulations for Electric Drive Control Devices. The terms and definitions defined in GB 7251.2-2006 and column F are applicable to this document. 3.1 Closed insulated busway: After covering the bare busbar with insulation material, the busway is placed tightly against the channel shell. 3.2 Feed type busbar trunking is composed of various busbar main units without tapping devices (without sockets). It is used to directly deliver electrical energy from the power supply to the distribution center. 3.3 Plug-in bus duct with tap off facilities The plug-in bus duct is composed of a bus ten wire unit with a tap off device and a plug in box. It is used to transmit electrical energy and can lead out a branch of the power supply. 3.4 Indoor type bus duct is suitable for bus ducts installed in buildings, which protect the bus ducts from wind, sun, and rain. 3.5 Outdoor type busway is suitable for outdoor work and is not affected by weather
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