![]() ![]() ![]() Ceiling penetrations are fire-stopped above the grid at the tile penetration. Plus, the strut grid provides a pleasing aesthetic for commercial and industrial applications. the structure above are exempt from the requirements in the pages that follow. In conclusion, strut grids using B-Line series solid strut, model B22, and electrical accessories as a raceway and non-structural support system, can save installers time, materials and maximize their profit. The romex is staples to the bottom of the joist and daisey chained from fixture to fixture. Spreading the load out can help contractors stay within parameters of the structures capacity without additional engineering concerns by the (SEOR) Structural Engineer of Record. Is it a code violation to run romex above a drop ceiling to 2x4 lay-in fixtures. Load ratings can be established on a per square foot basis, making the structural attachments predictable in both capacity and layout application. All non-structural services could land on the grid. To optimize and streamline materials and installation time, a strut grid can be an architectural feature that serves a utilitarian as well as a structural purpose. Supports for the conduits, then supports for the ductwork, then supports for the plumbing and heating pipes, supports for the cable trays, and on and on. Traditional systems are installed in sections with single purpose applications in mind. The connector options for mounting receptacles, hangers, and attachments for controls, NEMA type enclosures, luminaires, signage, occupation and safety equipment are virtually endless. National Electrical Code Introduction 5 Electrical Connections 110.14(D) Terminal Connection Torque 6 Ground-Fault Circuit-Interrupter Protection for Personnel 210.8 Preface 7 210.8 for Personnel 8 210.8(A) Dwelling Units 9-11 210.8(B) Other Than Dwelling Units 12-18 210. Server racks, enclosures & airflow management.Nothing in the NEC would prohibit the use of RMC as an EGC where listed threadless couplings are used. A nominal number for steel conduit can be determined by multiplying the expansion length in Table 352.44 by 0.20. In addition, 250.118 (2) recognizes RMC as an EGC. Informational Note: Table 352.44 and Table 355.44 provide the expansion information for polyvinyl chloride (PVC) and for reinforced thermosetting resin conduit (RTRC), respectively. Section 344.42 (A) specifically permits threadless couplings. Safety, security & emergency communications Section 344.6 requires all associated fittings, which would include couplings, to be listed.Process safety, automation, test and measurement.Medium-voltage power distribution & control systems.Low-voltage power distribution & control systems.The installation of cable in accessible attics or roof spaces shall also comply with 320.23. Industrial controls, drives, automation and sensors National Electrical Code Chapter 3 Wiring Methods and Materials Article 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS.Backup power, UPS, surge & IT power distribution. ![]()
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