Parallel conductors are often installed where large ampacity feeders or services are used. Total understanding of the paralleling requirements permitted in the National Electrical Code is necessary before attempting to design a large electrical system or install these conductors.
210.70 Lighting Outlets Required The National Electrical Code states its purpose as “the practical safeguarding of persons and property from hazards arising from the use of electricity.” [90.1(A)] The adequacy of the Code is covered in 90.1(B).
A little innovation goes a long way More than 25 years ago, Rexel’s Upper Marlboro (Md.) Regional Distribution Center came up with a value-add to improve service to contractor customers. Among the first to take advantage of Rexel’s wire cutting and paralleling service was Dynalectric Co.
It’s obvious that fiber optics is not copper wiring. Advantages of fiber include the capability of going longer distances at higher speeds, plus immunity to electromagnetic radiation. These advantages overcame its cost disadvantage and made it the cabling choice for telecommunication and CATV.
While the general market outlook for unshielded twisted-pair (UTP) and coax cable is flat, certain segments will jump this year. “Overall market growth will be in the lower single-digit area,” said Bill Miller, director of marketing for Belden Electronics Division.
210.52(H) Hallways Article 210 covers branch circuits except for those supplying only motor loads. Motor-load requirements are covered in Article 430. Receptacle-placement provisions are stipulated in 210.52(A) through (H).
In spite of previous setbacks, many in the telcom industry still see potential in Wireless Local Loop (WLL) technology to complete the connection between users and their phone companies. Past attempts have not been encouraging.
The Telecommunications Industry Association (TIA) has published two new standards, 'Commercial Building Telecommunications Cabling Standard, Part 2: Balanced Twisted Pair Cabling Components, Addendum 1 -- Transmission Performance Specifications for Four-Pair 100 Category 6 Cabling.
CODE CITATIONS Article 225 Feeders Article 230 Services Article 250 Grounding Article 408 Switchboards and Panelboards Article 445 Generators Article 680 Swimming Pools, Fountains and Similar Installation Systems NFPA 20 1999 Standard for the Installation of Stationary Pumps for Fire Protection Grou