NOTE 1 Throughout this part, the abbreviation BTS is used for a busbar trunking system. Where reference to Part 1 is made, the term ASSEMBLY therefore reads as “BTS”.This part of IEC 61439 lays down the definitions and states the service conditions, construction requirements, technical characteristics and verification requirements for low voltage BTS (see 3.101) as follows:• BTS for which the rated voltage does not exceed 1 000 V in case of a.c. or 1 500 V incase of d.c.;• BTS intended for use in connection with the generation, transmission, distribution andconversion of electric energy, and for the control of electric energy consuming equipment;• BTS designed for use under special service conditions, for example in ships, in railvehicles, and for domestic applications (operated by unskilled persons), provided that the relevant specific requirements are complied with;NOTE 2 Supplementary requirements for BTS in ships are covered by IEC 60092-302.• BTS designed for electrical equipment of machines. Supplementary requirements for BTSforming part of a machine are covered by the IEC 60204 series.This standard applies to all BTS whether they are designed, manufactured and verified on aone-off basis or fully standardized and manufactured in quantity.The manufacture and/or assembly may be carried out by a manufacturer other than the original manufacturer (see 3.10.1 and 3.10.2 of Part 1).This standard does not apply to individual devices and self-contained components, such asmotor starters, fuse switches, electronic equipment, etc. which will comply with the relevant product standard.This standard does not apply to the specific types of ASSEMBLIES covered by other parts of theIEC 61439 series, to supply track systems in accordance with IEC 60570, to cable trunkingand ducting systems in accordance with the IEC 61084 series, nor to power track systems inaccordance with the IEC 61534 series.