1、# t i Il I EIA IEBLS 83 W 3234b00 000Lb79 2 W JA.NUA RY 1088 . INDUSTRIAL ELECTRONICS *.BULLETIN NO. 15 PROVISION OF PREMISES WIRING . FOR ONE AND TWO LINE VOICE TELEPHONE SYSTEMS ELECTRONIC INDUSTRIES ASSOCIATION EIA IEBL5 83 H 3234600 OOOLb80 9 NOTICE EIA Engineering Standards and Publications are
2、 designed to serve the public interest t.hrough eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Exist
3、ence of such Standards and Pub- lications shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other
4、 than EIA members, whether the standard is . to be used either domestically .I or internationally. Recommended Standards and Publications are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume a
5、ny liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Recom- mended Standard or Publication. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department -2001 Eye Street, N.W. Washington, D.C. 20006 PRICE: $3.00 Published in U.S.A. EIA IEBLS 8
6、3 3234600 OOOLb8l O EIA INDUSTRIAL ELECTRONICS BULLETIN No. 15 PROVISION OF PREMISES WIRING , FOR ONE AND TWO LINE VOICE TELEPHONE SYSTEMS JANUAR-Y 1983 Prepared by EIA TR-41 Committee on Voice Telephone Terminals P .) a EIA IEBLS 83 W 3234b00 0002682 2 W . *- EIA ENGINEERING BULLETIN FOR PROVISION
7、OF PREMISES ,. FOR ONE AND TWO LINE VQICE TELEPHONE SYSTEMS *o, 1 INTRODUCTION 1.1 Industry efforts to expand a series of EIA Recomended, Standards for Voice Telephone Terminal Equipment have included disc.ussions. on the provision of premises wiring for one and two line telephone systems. 1.2 This
8、Engineering Bulletin establishes requirements for. qnnecting one and two line terminal equipment to the public telephone net ia premises wiring, prior to the publication o a more comprehensive-EIA ndad Stand- ar? on “Premises Wiring for Voice Telephone Terminals“. 1.3 This Engineering Bulletin fulfA
9、lls a need to accommodate the instal- lation of premises wiring by nontelephone company .personnel for connection. to the public telephQne network. It will be.usefu1 to commhsions,. telephone companies, and others as an industry reerence This Engineer g Builetin is the reeult of Cooperation cm an in
10、dustry-wide basis to estab sh compatible wiring arrangements. 1.4 In accordance with EIA Engineering Publication EP-7, two categories of performance standards are specified, mandatory and advisory, The rnandatoiy performance criteria are designated by the word “shqll“; advisgry are designated by the
11、 words “should“, “may“, or “desirabie“ (which aye used interchangeably in this standard). The mandatory criteria generally apply to safety *and proteSc- tion, signaling, and compatibility. They specify the 6 or electricai or metal pipe ng codes may dict .= 9 EIA IEBL5 83 m 3234600 0001b84 b m Page 3
12、 3.7 Connecting Block O A device used for connecting premises wiring. 3.8 Dial Light _. A small light bulb- powered by low voltage used to illuminate a telephone set dial. 3.9 Drive Rings A device used to hold premises wiring in place where appearance is not a factor. The nail in a drive ringis driv
13、en into the supporting surface and the ring is open to permit placing of the wires. Drive rings shall be used at least six (6) feet from the floor so that its nail will not present a safety hazard. 3.10 Drop Wire Drop wire is used to extend telephone service to the premises; it may be either aerial
14、or buried. 3.11 Ground Part of an electrical path or connection that terminates on a grounding system or ground rod in the earth. 3.12 Ground Connection * Metallic paths (wires, rods and clamps) which connect electrical circuits to earth ground, usually for protective reasons. 3.13 Ground Rods A sol
15、id metal rod or pipe which is driven into the earth to provide an earth ground for electrical circuits. . 3.14 Hardwired . The term “hardwired“ as applied to voice terminal equipment means the connection of the equipment line cord to a connecting block with screw temina- tions. Under the FCC Registr
16、ation Program for terminal equipment, anly that equipment which was connected to the public telephone network in a “hardwired“ manner prior to July 1, 1979, may remain.connected dr be reconnected in such a fashion. See “Modular. 3.15 Modular The term “modular“, as used in this document, means the co
17、nnection of the voice terminal equipment line cord to th premises wiring by means of .a plug and jack arrangement. Such plugs and jacks are described in Part 68 of the FCC Rules and Regulations. r EIA IEB35 83 M 3234b00 0003b85 8 M Page 4 3.16 Network Interface The point of connection between termin
18、al equipment or premises wiring and the public telephone network. -. 3.17 Non-metallic Sheath Cable An assembly of insulated conductors that has an outer sheath of non-metallic material. 3.18 Open W i r ing Commercial ac powgr wires which are insulated but do hot have an outer protective jacket. 3.1
19、9 Premises . Premises is the discrete real property on or within a single building owned, leased or controlled by a customer of the public telephone network. 3.20 Premises Wiring Wiring that distributes telephone service within the premises beyond the Network Interface. 3.21 Protector A device used
20、as protection from hazardous voltages, (e.g.8, 1,ighfning It may be mounted either inside 01: outside the premises. Th protec- strikes), tor is not part o premises wiring. 3.22 Raceway A metal or plastic channel used for holding electrical and telephone wires in buildings. 3.23 A raceway is usually
21、located in the floor. Registered Terminal. Equipment Terminal equipment which is registered for connection to the public telephone network in accordance with Part 68 of the FCC Rules and Regulations. If a terminal device has been FCC registered it will have a registration number permanently affixed
22、to it. 3.24 Tip and Ring ,. As used within this document, tip and ring refer to the wires $n a two wire telephone oircuit. The ring usually has negative battery potenth1 with respect to the tLp. 3.25 Transformer AS used in this documentr a transformer is an electrical device which e reduces commerci
23、al AC voltage to provide power or a dial light or ancillary equipment. 7- / 7 - - f -3 r -* EIA IEBLS 83 3234b00 000Lb8b T = Page 5 3.26 Wire clamp A device used to secure premises wiring to a surface. One end is U-shaped or placement over the wire. The other end contains a tab which is affixed to t
24、he mounting surface with a nail or screw. 3.27 Wire Guard e A length of plastic (round or U-shaped) used to protect telephone wiring from abrasion or foreign voltages. 4 TECHNICAL REQUIREMENTS 4.1 Means of Connection to the Network 4.1.1 The physical and electrical demarcation between premises wirin
25、g and public telephone network is the Network Interface. The means of connection at the Network Interface shall be in accordance with Part 68 of the FCC Rules and ReguJations. 4.1.2 The functions of the Network Interface are to provide: (1) A convenient connection between the public telephone networ
26、k and premises wiring; (2) a means for isolating troubles between public telephone network facilities and premises wiring. 4.1.3 The Network Interface will provide for terminating four conductors and will not alter the established parameters of the service provided 4.1.4 The location of the Network
27、Interface may be inside, or outside on the premises, will provide reasonable access for the customer and telephone company personnel, and will be at the discretion of the telephone company. 4.2 General Technical and Safety Considerations 4.21 Premises wiring shall only be used to conduct the operati
28、ng signals, voltages, and currents normally found on the public telephone network. However, this does not preclude use of vacant pairs by ancillary telephone devices provided that such use does not interfere with the public telephone network. Specific requirements are under consideration. 4.2.2 Norm
29、al operation of the public telephone network involves the presence of voltages and currents, some constant, some intermittent. Therefore, premises wiring shall not be installed or serviced without first disconnecting the premises wiring from the Network Interface and from any other power soure. 4.2.
30、3 When installing or testing a low voltage transformer used as a power supply for dial lights , speaker phones, etc. bodily contact with the commercial c power terminals of the transformer should be avoided. There shall be no more than one transformer connected to a given pair of .premises wires. e
31、EIA IEBL5 83 3234b00 000Lb87 L 9 + Page 6 4.2.4 Premises wiring jacks shall not be located in places where dangerous conditions are expected. In kitchens, they shall be located a reason- able distance from grounded metallic surfaces such as sinksI ranges, or refrigerators. Jacks shall not be located
32、 in areas where teleEhone devices or handsets can be immersed in water. 4.2.5 Premises wiring shall not be installed or maintained in recreational trailers, mobile homes or metal-sided buildings, where the metal siding, framework or other conducting surfaces have an electricai potential with respect
33、: to ground. 4.2.6 Protectors, grounding systems and attachme placed by the telephone company shall not be connected to, disturbed, removed or otherwise modified by other than telephone company personnel. 4.2.7 During lightning storms, it is possible for very high, short-duration voltages to appear
34、on telephone instruments and wiring. Premises wiring shall not be installed or maintained during active lightning discharge conditions. 4.2.8 Persons wearing pacemakers shall not work on premises wiring. . 4.2.9 The installation of premises wiring in explosive areas or hazardous locations shall comp
35、ly with Articles 500 through 516, and Article 517, Section G, of the National Electrical Code, and with local building codes. 4.3 Material Requirements Wire - 4.3.1 4.3.1.1 Premises wiring shall be twisted in a four conductor spiral or as two twisted pairs. Three or four pair wire shall have the con
36、ductors twisted together to form pairs and then grouped together to form the cable core. The wire pairs shall be covered with a jacket of polyvinyl- chloride or a functionally equivalent compound which has a 1500 Vrms minimme breakdown rating. a 4.3.1.2 4.3.1.3 Each conductor shall be solid annealed
37、 copper, individually insulated with distinctly colored, high density polyethylene or functionally equivalent compound., 4.3.1.4 The public telephone network is designed for proper operation assuming a limited amount o resistance introduced by premises wiring, telephone sets, and ancillary equipment
38、. Generally, wire runs should be Limited to 250 feet for # 22 awg wire, 200 feet for # 24 awg wir wire runs which provide suppott for any objects: excessively hot locations: steam pipes, heating ducts, hot water pipes, etc.;- locations where wires will be subjected to abrasion or corro- sion; betwee
39、n two structural studdings with commercial ac power that is concealed. EIA IEBLS 83 W 3234b00 OOOLb90 I Page 9 4.4.2.4 Wiring shall be placed where it will be least likely to be Wiring shall always be suitably supported by means which do broken or detached. not aavergely affect the insulating proper
40、ties of the wiring. 4:4.2.5 Wiring should fol1ow.joicts; however, if it becomes neces- sary to span joists, wiring shall be run no more than three (3) inches from a wall to auoidpossible damage to the wire. 4.4.2.6 Whenever wire conduit is available or is required by applicable codes, it should be u
41、sed. 4.4.2.7 When drilling through walls, floors, or ceilings to place premises wiring, avoid contact with concealed hazards such as other electrical wiring, gas pipes, steam pipes, water pipes, etc. 4.4.3 Wire Separations 4.4.3.1 Minimum separations are required in or on buildings, between telephon
42、e wirlng and other conductors or metallic objects. The wiring separations specified in Table 3 are required for crossing and parallel runs. For wire crossings, alternacives to the minimum separations are also shown. 4.4.3.2 Separations of less than six (6) feet between premises wiring and lightning
43、wire on rods are permissible under the following condi- tions: (1) Where telephone, power, and lightning rod ground connections are all made to a common metallic cold water pipe that sic properly grounded; (2) where separately driven ground rods are used for telephone, power, and lightning rod insta
44、llations, and the ground rods are . bonded together. In no case shall the separation be less than four (4) inches. EIA IEBLS 83 = 3234600 OOOLbL 3 = * -/ Page 10 Table 3 Separation and Physical Protection for Premises Wiring This table applies to premises wiring from the Network Interface to telepho
45、ne eqipment. Minimum separations between premises wiring, whether located inside or attached to the outside of buildings, and other types o wiring involved, which apply to crossings and to parallel runs, are as follows, Minimum Separa- Wire Crossing Type of Wire Involved tions Alternatives Electric
46、Supply Bare wire of any voltage. 5 3%. No Aitermgive Open wiring not over 300 2 in. See Note 1 volts. Wires in separate conduit, None N/A in armored or non-metallic sheath cable, or power ground wires. .I - Antenna lead-in and ground 4 in, S&e Note 3. wires ,. Radio si Televison Signal or Control Op
47、en wiring or wires in None N/A Communications Wire Community televisions None N/A Wires separate conduit or cable. systems coaxial cables with grounded shielding . Telephone Drop Wire Al1 types 2 in, See Note 1 . Sign Neon signs and associated 6 in. No Alternative wiring from transformer. Lightning
48、System Lightning sods and wires, 6 ft. See 4.3.3.2. Note 1: If minimum separations cannot be obtained, additional protection by means of a plastic tube, wire guard, or two layers of vinyl tape extending two inches beyond each side of object being crossed shall be provided. 5 WIRING OPERATIONAL TESTS
49、 5.1 Upon completing an installation or change in the,premices wiring, the installer shall perform an operational test, This test shall consist of lifting the handset of a functioning telephone which has been connected to the newly placed wire, listening for dial tone, dialing a digit other than zero OE one to eliminate dial tone, listening for noise, and hanging up. - EIA IEB35 83 W 3234600 0003692 5 W U Page 11 a 5.2 If excessive noise occurs during testing, if dial tone cannot be heard or eliminated, or if trouble develops .subse
