Mounting putty to route cords8/14/2023 ![]() ![]() Openings around electrical penetrations must be firestopped using approved methods to maintain the fire-resistance rating. Use firestop methods approved by the AHJ to maintain the fire-resistance rating of the fire-rated assembly ( Fig.Use firestop material listed for the specific types of wiring methods and construction structures.Firestop any openings in fire-rated walls, floors, and.Cables installed in concealed raceways are not considered “accessible,” so you do not have to remove them.Īnother way is install cables and raceways with proper firestopping : If a cable does not terminate and is not for future use, then you must remove the accessible portion of it.This way, it’s easy to distinguish them from abandoned cables. If you do not terminate some cables because they are for future use, make sure you identify each one with a tag that can withstand the environment involved.One way to reduce the spread of fire or products of combustion within a building is to remove abandoned cables : NFPA 90A-2009 does not require support hardware to be listed, but NFPA 90A-2009 has heat release and smoke emissions requirements for cable ties in sections 4.3.11.2.6.5 (plenums) and 4.3.11.5.5.6 (raised floor plenums). You’ll find the accepted industry practices in ANSI/NECA/BICSI 568, “Standard for Installing Commercial Building Telecommunications Cabling” and ANSI/NECA/FOA 301, “Standard for Installing and Testing Fiber Optic Cables.” See NFPA 90A-2009, “Standard for the Installation of Air-Conditioning and Ventilating Systems,” for discrete combustible components installed per 300.22(B) and (C). from the nearest edge of the framing member or furring strips, or is protected by a 1⁄16-in.-thick steel plate or the equivalent. Install the wiring method so it is at least 1¼ in. Ĭables installed through (or parallel to) framing members or furring strips must be protected where they are likely to be penetrated by nails or screws. In addition, do not strap, tape, or attach optical fiber cables (or any other kind of cable) to the exterior of any raceway as a means of support. Do not use the ceiling-support wires or ceiling grid directly. You can support raceways and cables by independent support wires attached to the suspended ceiling per 300.11(A). Per the NEC, make sure you secure cables with straps, staples, hangers, cable ties, or similar fittings designed and installed in a manner that won’t cause damage to them. Secure the cables with straps, staples, hangers, cable ties, or similar fittings designed and installed in a manner that won’t damage the cable ( Fig. However, you must take this approach for exposed cables to ensure the cable will not be damaged by normal building use. But such an approach in a ceiling space is not always cost-effective or even possible. Ideally, you will run those cables with supports that fasten to frame members. For example, you must run them so they are not resting on top of ceiling tiles in a way that blocks access. ![]() One of the implications of this is the routing of your cables cannot interfere with access to equipment. You must install equipment and cabling in a neat and workmanlike manner. Because the NEC considers these electrical cables, they must comply with the appropriate requirements of Chapter 1 through Chapter 4. You can use these only where the optical fibers and current-carrying electrical conductors are functionally associated. Article 770 does not refer to 300.15, so you do not have to put optical splices in boxes.Īrticle 770 also applies to composite cables, which combine optical fibers with current-carrying conductors. ![]() įor example, subsection 770.113 refers to 300.22, which applies when installing optical fiber cables and optical fiber raceways in ducts and plenum spaces. 300 do these apply to optical fiber cables and raceways. 770 references sections in Chapter 2 and Art. When installing optical fiber cables, the requirements for wiring methods are located in Art. Where does the NEC provide all of its requirements for wiring methods? If you answered Chapter 3, you are almost correct. ![]()
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