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 in
case of d.c.;
• BTS intended for use in connection with the generation, transmission, distribution and
conversion 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 rail
vehicles, and for domestic applications (operated by unskilled persons), provided that the
relevant specific requirements are complied with;
• BTS designed for electrical equipment of machines. Supplementary requirements for BTS
forming 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 a
one-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 as
motor 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 the
IEC 61439 series, to supply track systems in accordance with IEC 60570, to cable trunking
and ducting systems in accordance with the IEC 61084 series, nor to power track systems in
accordance with the IEC 61534 series.