: Busbar trunking systems (BTS) and their associated fittings.
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To comply with the standard, a busbar system must meet rigorous performance criteria across several categories: : Busbar trunking systems (BTS) and their associated
: Materials must not propagate fire or release excessive toxic smoke. | Parameter | IEC 60439-2 (Old) | IEC
| Parameter | IEC 60439-2 (Old) | IEC 61439-6 (Current) | | --- | --- | --- | | | Mostly by calculation | Mandatory type testing | | Temperature rise limits | 70K for insulated conductors | 105K max, but reduced for accessibility | | Short-circuit rating | Only at feeder end | Throughout the system | | Harmonic derating | Not addressed | Explicit requirement | | Declaration of conditions | Less detailed | Full installation conditions required |
Furthermore, the standard makes a clear distinction between a busbar trunking system (covered by IEC 61439-6) and other types of assemblies. For example, it explicitly states that it does not apply to cable trunking systems (covered by the IEC 61084 series) or power track systems (covered by the IEC 61534 series). This distinction is important for engineers to correctly classify and specify their equipment.
CE marking claims compliance with EU Low Voltage Directive, but not automatically with IEC 61439-6. You must request the manufacturer’s test report (TTR) verifying the specific type tests.