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Busway Compliance Consultation, Seattle
Client
Confidential (manufacturer of busway-based lighting systems)
Industry
Commercial retail (lighting busway)
Location
Seattle, WA
Dates
February 2023 (report issued 2/3/2023, revised 2/6/2023)
Team Size
Services
NEC compliance review of a busway lighting design
Written code-interpretation report
Support for the manufacturer’s response to the specifying engineer
Summary
A manufacturer of busway-based lighting had its design questioned by the specifying engineer on a retail store project. MHL reviewed the system against NEC overcurrent protection rules for busway taps and issued a written report concluding the design appeared compliant with NEC 368.17(C), with one item to confirm.
Problem / Objective
The specifying engineer said the lighting busway was listed as busway and had to follow busway rules, that its documentation was inadequate, and that the current limiters shown were meant for track lighting. The objective was an independent code opinion the manufacturer could use to seek design approval.
Process
Collected the specifying engineer’s forwarded comments, the permit set and the manufacturer’s electrical design.
Investigated the tap-protection question, including 368.17, 240.4, 240.21 and 410.36(F), and ruled out arguments that would not hold up.
Built a step-by-step reading of NEC 368.17(C) showing the line-feed device supplies the overcurrent protection and external operation required for the taps.
Issued the report, then revised it at the client’s request to remove the research section.
Payoff / Results (Metrics)
Independent finding that the design appeared compliant with NEC 368.17(C).
One open item flagged: confirm the means to operate disconnects from the floor where devices are out of reach.
Report delivered within days of the request, giving the manufacturer a document to put in front of the specifying engineer.
When this applies
A busway or lighting-system manufacturer, contractor or lighting designer whose design is being challenged by a reviewing engineer on overcurrent protection, tap devices or listing. Also relevant if you need a neutral engineer to read NEC 368 and 240.21 closely and put a defensible opinion in writing for a Washington project.
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