The NEC and Communications Circuits | Electrical Construction & Maintenance (EC&M) Magazine


nec article 800

Article is the first Article in Chapter 8. The Chapter title is "Communications Systems" and the Article title is "Communications Circuits." Article follows the convention in the NEC of being the foundation article for either the whole Chapter or for the first series of Articles (not all . Jul 17,  · Understand NEC Articles and , and how they affect network cabling for electrical engineers. Determine which Article to start from, depending on the circuit type being installed. Identify how the circuits from the two Articles support each other in installation requirements, shared pathways. NEC information; expand your knowledge of the National Electrical Code with our free series of NEC 10 Tips, each covering an aspect of the Code. This article explains Article , Communications Circuits; Part 5 of a multi-part series.

Consulting - Specifying Engineer | Clarifying NEC Articles and

Mike Holt Jul 15, Section Install communications equipment and cabling in a neat and workmanlike manner [ Support exposed cables with supports that fasten to frame nec article 800, securing the cables with straps, staples, hangers, nec article 800, cable ties, or similar fittings [ You can support raceways and cables by independent support wires attached to the suspended ceiling per Communications equipment must be listed [ This distinguishes them from abandoned cables.

Firestop openings in fire-rated walls, floors, nec article 800, and ceilings for electrical equipment. Use firestop material listed for the specific types of wiring methods and construction structures. Use firestop methods approved by the AHJ to maintain the fire-resistance rating of the fire-rated nec article 800 [ Overhead aerial communications cables must have a vertical clearance of at least 8 ft from all points of roofs above which they pass [ You can reduce this clearance to 18 in.

You can install unlisted communications cables in building spaces other than risers, ducts, or plenum spaces as described in For each communications circuit, nec article 800, you must install a listed primary protector as close as practicable to the point of entrance [ In installations where the communications cable enters a building, the metallic sheath members of the cable can be grounded as specified in Bond and ground the primary protector and the metallic member of cable sheaths per What does this entail?

The two simplest requirements are:. At least 14 AWG with a current-carrying capacity of not less than the grounded metallic sheath member or protected conductor of the communications cable. Not required to be larger than 6 AWG. As short as practicable. The bonding conductor and grounding electrode conductor must not be subject to physical damage. If installed in a metal raceway, bond each end of the raceway to the contained conductor or connect the ends to the same terminal or electrode to which the bonding conductor or grounding electrode conductor is connected.

There is an exception for If the bonding conductor or grounding electrode conductor is more than 20 ft long for one- and two-family dwellings, then install a separate ground rod at least 5 ft long [ Bond this to the power grounding electrode system with a minimum 6AWG conductor [ Structure with intersystem bonding termination IBT.

The bonding conductor for the primary protector and the nec article 800 sheath of communications cable must terminate to the IBT as required by Structure without IBT. The bonding conductor or grounding electrode conductor must terminate to the nearest accessible:. Structure without Nec article 800 or grounding means.

The grounding electrode conductor must connect to:. Communications cables installed within buildings must be listed unless the length of the cable from its point of entrance does not exceed 50 ft as nec article 800 by You can install communications cables in any Chapter 3 raceway, nec article 800, following the requirements of Chapter 3 [ Raceway fill limitations of Alternatively, you can install the cables in a listed communications raceway if you do so per If you nec article 800 communications cables in fabricated ducts used for environmental air, you can choose from five permissible cable types.

You can use up to 4 ft of Type CMP cable with no raceway restrictions, nec article 800. In plenum spaces used for environmental air, the requirements are similar but a bit more complex [ Communications cables can be in the same raceway, cable tray, cable routing assembly, or enclosure as conductors of any of the following [ Communications conductors can be within the same cable as Class 2 or Class 3 conductors, if the cables comply with Art.

Getting these few facts documented from the outset will help you avoid the most common communications cabling system mistakes. Holt is the owner of Mike Holt Enterprises, Inc. He can be reached at www.

Avoid the most common communications cabling system mistakes by following the requirements found in Art. Hide comments. More information about text formats. Text format Comments Plain text. Web page addresses and e-mail addresses turn into links automatically. Lines and paragraphs break automatically. Leave this field blank. Motor Calculations — Part 1. Conductor Sizing — Part 1 of 2. Load More.


Communications Systems Grounding Rules | Electrical Contractor Magazine


nec article 800


“Article Tips” on page 52 highlights some key points for proper application of Art. How can you keep track of all the details? One trick is to remember these three principles of Art. Keep these communications circuits separate from other circuits, such as those used for power and Mike Holt. Article - Communications Circuits. by Mike Holt for EC&M Magazine. Don’t let misunderstandings of Article hang you up. The telephone company provides the cable to a terminal box at the building and installs a ground wire to the grounding electrode system [(B)(4) and ]. Mike Holt Enterprises, Inc. • • () 67 Communications Circuits Author’s Comment: For Articles , , and , the differ-ence between a “bonding conductor” and a “grounding electrode conductor” is where they terminate. The bonding conductor ter-.