Rackstamp, data center labeling field guide

SOURCE NOTE / S63

UL Standards: UL 857, Busways

Publisher listing for the busway product standard, fourteenth edition published September 10, 2025. Establishes that the scope covers busways and associated fittings including tap boxes, feed boxes and plug-in devices. No requirement, clearance, rating or marking text is reproduced here.

SOURCE CHECK / SEP 12, 2026

Read it in context.

Publisher listing for the busway product standard, fourteenth edition published September 10, 2025. Establishes that the scope covers busways and associated fittings including tap boxes, feed boxes and plug-in devices. No requirement, clearance, rating or marking text is reproduced here.

The linked guide explains how this source informs its topic. Check the document’s scope and the edition adopted by your project before applying it. A publisher overview or product guide does not reproduce the full requirements of a standard.

Read the library’s edition and applicability notes.

What this source establishes

Establishes the busway product standard, its current edition and date, and that its scope covers plug-in devices and tap boxes. It does not establish what a field identification label should say.

Review date: 2026-09-16. This note describes the source scope; it is not a project approval.

Used in these guides

33Busway tap-offsNobody can tell which tap-off box feeds which rack