(2) Where the raceway contains power supply conductors for electrically controlled equipment and is used to support Class 2 circuit conductors or cables that are solely for the purpose of connection to the equipment control circuits. These conductors shall be permitted to be installed as permitted by 300.11(C)(2).ģ00.11(C) Raceways Used as Means of Support. The 2014 NEC change to 424.66 (B) has made the requirements for clear work space around duct heaters tougher. Class 2 or Class 3 circuit conductors shall not be strapped, taped, or attached by any means to the exterior of any conduit or other raceway as a means of support. Insufficient working space for above ceiling HVAC disconnect switches. Once there, click on their link to free access to the latest NEC ® edition of NFPA 70.ħ25.143 Support of Conductors. See the actual NEC ® text at NFPA.ORG for the complete code section. Once there, click on the free access link to the latest edition of NFPA 731.Ĥ.6.3.5 Premises security system wiring and cables shall be of the gauge, strands, insulation, and electrical properties specified by the equipment manufacturer.Ĥ.6.3.6 Connections of conductors to terminal parts shall ensure a tight, conductive connection without damaging the conductors and be made by means of pressure connectors, wire binding screws, or splices to flexible leads.Ĥ.6.3.7 Conductors shall be connected to devices and to fittings so that tension is not transmitted to joints or terminals.Ĥ.6.3.8 Wires and cables shall not be placed in such a manner as to prevent access to equipment.īelow is a sample of the NEC ®. D NEC 230.70 & 240.24 Electrical panels shall. For the complete section, see the actual NFPA 731 text at NFPA.ORG. either outside a building or structure or inside nearest the point of entrance of the service entrance conductors. NEC 300.11(C)(2) allows strapping a low voltage Class 2 cable to the outside of a raceway only if the raceway contains conductors that are also associated with the low voltage installation.īelow is a sample of NFPA 731. ![]() Installers are known to grab a handful of zip ties and strap low voltage cables to anything they can when wiring above a grid ceiling. Its quite common to see low voltage wiring methods strapped to an existing conduit especially above a suspended ceiling. ![]() Section 725.143 and 800.24 also require the support of cables to be in accordance with NEC ® 300.11 which provides rules on when a cable can be strapped to the outside of a raceway. One requirement in NEC ® 725.24 and 800.24 is that cables and conductors installed exposed on the surface of ceilings and sidewalls shall be supported by the building structure in such a manner that the cable will not be damaged by normal building use. You can't use a ladder tall enough to reach the beams without standing on the top step. NFPA 731 Section 4.6.3.1 requires the installation of all wiring, cable, and equipment to be performed in accordance with NFPA 70 (NEC), Article 725 or Article 800, where applicable. 1 I spent most of today, and will likely spend all of tomorrow, running 1' and 3/4' EMT on the beams above a suspended ceiling.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |