beyond the fitting; The raceway is fastened at its outer end and at other points as necessary; and. Conductors shall be run as multiconductor cord or cable assemblies. Payment is required in advance of scheduling the installation of a temporary service according to the applicable Company tariff. Flexible cords used in show windows and showcases shall be Type S, SE, SEO, SEOO, SJ, SJE, SJEO, SJEOO, SJO, SJOO, SJT, SJTO, SJTOO, SO, SOO, ST, STO, or STOO, except for the wiring of chain-supported lighting fixtures and supply cords for portable lamps and other merchandise being displayed or exhibited. Article 590 of the Code provides minimum requirements … Brass shell, paper-lined sockets, or other metal-cased sockets may not be used unless the shell is grounded. If specified in paragraph (j)(4) of this section that one piece of equipment shall be "within sight of" another piece of equipment, the piece of equipment shall be visible and not more than 15.24 m (50.0 ft) from the other. Receptacles, cord connectors, and attachment plugs shall be constructed so that no receptacle or cord connector will accept an attachment plug with a different voltage or current rating than that for which the device is intended. Temporary electrical installations can carry risks, even in the most benign of environments. Switchboards with exposed live parts. Support shall be in the form of staples, cables ties, straps, or similar type fittings installed so as not to cause damage. the various electrical ordinances guarantees to the customer a wiring installation complete and adequate for the full use of electric service now and in the future. It was taken at one of my projects a few years ago. 1910.305 (a) (2) (iii) Temporary electrical installations of more than 600 volts may be used only during periods of tests, experiments, emergencies, or construction-like activities. §4.2.1 Removed typical electrical loads served by open and closed delta transformer installations. The controller disconnecting means for motor branch circuits over 600 volts, nominal, may be out of sight of the controller, if the controller is marked with a warning label giving the location and identification of the disconnecting means that is to be locked in the open position. Any pipe or duct system foreign to the electrical installation may not enter or pass through a transformer vault. Metallic cable trays may be used as equipment grounding conductors only where continuous maintenance and supervision ensure that qualified persons will service the installed cable tray system. However, a single disconnecting means may be located adjacent to a group of coordinated controllers mounted adjacent to each other on a multi-motor continuous process machine. Liquid-filled or dry-type transformers used for research, development, or testing, where effective safeguard arrangements are provided. III. These require competence and the Person Responsible within a … Multiconductor cable, Type MV; where exposed to direct rays of the sun, the cable shall be identified as being sunlight resistant. For such installations, a permanent sign shall be installed on the switch enclosure or immediately adjacent to open switches that read, "WARNING -- LOAD SIDE TERMINALS MAY BE ENERGIZED BY BACKFEED.". Conductors smaller than No. Temporary wiring must be removed immediately upon completion of the project or purpose for which the wiring was installed. To allow only the use of 110 volt for portable electric tools. ); where exposed to direct rays of the sun, cables shall be identified as being sunlight resistant; Welding cables installed in dedicated cable trays; Single conductors used as equipment grounding conductors; these conductors, which may be insulated, covered, or bare, shall be No. No branch-circuit conductor may be laid on the floor. All pull boxes, junction boxes, and fittings shall be provided with covers identified for the purpose. Where installed in raceways, except as otherwise permitted in this subpart. R. 2920 of 23 October 1992; "electrical tester for single phase" means a person who has been registered as an electrical … ; Meter sockets - specifications. 14 and larger may be repaired if spliced so that the splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced. A receptacle installed in a wet location where the product intended to be plugged into it will be attended while in use (for example, portable tools) shall have an enclosure that is weatherproof when the attachment plug cap is removed. Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal noncurrent-carrying parts that are to serve as grounding conductors, with or without the use of supplementary equipment grounding conductors, shall be effectively bonded where necessary to ensure electrical continuity and the capacity to conduct safely any fault current likely to be imposed on them. from a tap or splice; Within 305 mm (12 in.) However, where cable with an entirely nonmetallic sheath enters the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 457 mm (18 in.) TEMPORARY AND PERMANENT SERVICE A. In industrial establishments where conditions of maintenance and supervision assure that only qualified persons will service the installed cable tray system, the following cables may also be installed in ladder, ventilated-trough, or ventilated-channel cable trays: Single conductor cable; the cable shall be No. The metal raceway shall be supplemented by an internal insulated equipment grounding conductor installed to ground the equipment enclosure. A contractor must, in addition to compliance with the Electrical Installation Regulations, 2009, and the Electrical Machinery Regulations, 1988, promulgated by Government Notice No. ELECTRIC SERVICE INSTALLATION REQUIREMENTS 4 G. Service mast shall be rigid metal conduit and have a minimum diameter of 1½ inch. All capacitors, except surge capacitors or capacitors included as a component part of other apparatus, shall be provided with an automatic means of draining the stored charge after the capacitor is disconnected from its source of supply. This article will consider the various regulations and requirements applicable to temporary electrical installations in construction and demolition sites. The maximum size need not exceed 70 sq mm. Electric: Single-Family Residential, permanent and temporary service Each temporary installation has time constraints, after which the temporary wiring must be removed. Combustible material, combustible buildings and parts of buildings, fire escapes, and door and window openings shall be safeguarded from fires that may originate in oil-insulated transformers attached to or adjacent to a building or combustible material. Any issues viewing the site should be reported directly to Municode technical support at support@municode.com. Occupational Safety & Health Administration. Each electric appliance shall be provided with a nameplate giving the identifying name and the rating in volts and amperes, or in volts and watts. 5 . Marking shall be located so as to be visible or easily accessible after installation. Each branch circuit that supplies receptacles or fixed equipment shall contain a separate equipment grounding conductor if run as open conductors. Only the following wiring methods may be installed in cable tray systems: armored cable; electrical metallic tubing; electrical nonmetallic tubing; fire alarm cables; flexible metal conduit; flexible metallic tubing; instrumentation tray cable; intermediate metal conduit; liquidtight flexible metal conduit; liquidtight flexible nonmetallic conduit; metal-clad cable; mineral-insulated, metal-sheathed cable; multiconductor service-entrance cable; multiconductor underground feeder and branch-circuit cable; multipurpose and communications cables; nonmetallic-sheathed cable; power and control tray cable; power-limited tray cable; optical fiber cables; and other factory-assembled, multiconductor control, signal, or power cables that are specifically approved for installation in cable trays, rigid metal conduit, and rigid nonmetallic conduit. Covers of outlet boxes having holes through which flexible cord pendants pass shall be provided with bushings designed for the purpose or shall have smooth, well-rounded surfaces on which the cords may bear. James Bond has a license to kill. Temporary electrical wiring on equipment and at construction sites should comply with the appropriate requirements of the … A conductor of a flexible cord or cable that is used as a grounded conductor or an equipment grounding conductor shall be distinguishable from other conductors. Decorative lighting.You can supply temporary electrical power for decorative lighting for up to 90 days [590.3(B)]. Boxes shall be closed by suitable covers securely fastened in place. Additional standards and codes of practice would generally be needed to satisfy a specific application - it is the responsibility of the … Flexible cords and cables shall be connected to devices and fittings so that strain relief is provided that will prevent pull from being directly transmitted to joints or terminal screws. Emergencies and tests.You can in… The disconnecting means shall disconnect the motor and the controller from all ungrounded supply conductors and shall be so designed that no pole can be operated independently. Where motor overload protection external to the appliance is required, the appliance shall be so marked. Dry-type, high fire point liquid-insulated, and askarel-insulated transformers installed indoors and rated over 35kV shall be in a vault. Lampholders installed in wet or damp locations shall be of the weatherproof type. Figure 1 – Pole supports for underground connections. To view the St. Petersburg Codes, go to the Municode web site.Municode is a third party service and is responsible for the content of their web site. To prevent danger, construct or protect electrical equipment that could be exposed to rain or other adverse conditions with suitable and sufficient covers, enclosures or shelters. This is not necessarily the case. A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is weatherproof when the receptacle is covered (attachment plug cap not inserted and receptacle covers closed). You can use temporary electrical power and lighting installations during the construction, remodeling, maintenance, repair, or demolition of buildings, structures, equipment, or similar activities [590.3(A)]. If used as permitted in paragraphs (g)(1)(ii)(C), (g)(1)(ii)(G), or (g)(1)(ii)(I) of this section, the flexible cord shall be equipped with an attachment plug and shall be energized from an approved receptacle outlet. If the appliance is to be used on a specific frequency or frequencies, it shall be so marked. III.G Temporary Service Clarified that approved meter enclosures are required Mar 2010 Fig IV-1 and IV-2 Temporary Service Clarified that approved meter enclosures are required Mar 2010 Fig IV-8 Self-contained overhead service Added 240/480V, 3 wire to wiring diagram Mar 2010 For installation in lighting fixtures and in similar equipment where enclosed or protected and not subject to bending or twisting in use; or. Carrying currents due to faults on the capacitor side of the switch; A means shall be installed to isolate from all sources of voltage each capacitor, capacitor bank, or capacitor installation that will be removed from service as a unit. By Mike Holt, for EC&M Magazine. The mast shall not exceed 4 feet or be less than 2 feet above the roof line, except as approved or required by the Company. R. 1593 of 12 August 1988, ensure that- (a) before construction commences and during the progress thereof, adequate … Where installed as conduit or tubing, the allowable cable fill does not exceed that permitted for complete conduit or tubing systems. There is no relaxation of safety standards in BS 7671 for temporary installations. The following requirements apply to feeders: Feeders shall originate in an approved distribution center. At intervals not exceeding 1.37 m (4.5 ft), and at closer intervals sufficient to provide adequate support where likely to be disturbed. Every earthing connection and joint must be properly made by means of efficient clamps or couplings. Temporary electrical power and lighting installations of 600 volts, nominal, or less may be used only as follows: During and for remodeling, maintenance, or repair of buildings, structures, or equipment, and similar activities; For a period not to exceed 90 days for Christmas decorative lighting, carnivals, and similar purposes; or. Flexible cords and cables may be used only for: Connection of portable lamps or appliances; Connection of stationary equipment to facilitate their frequent interchange; Prevention of the transmission of noise or vibration; Appliances where the fastening means and mechanical connections are designed to permit removal for maintenance and repair; Data processing cables approved as a part of the data processing system; Temporary wiring as permitted in paragraph (a)(2) of this section. 271 0 obj <>stream Flexible cords may be used only in continuous lengths without splice or tap. Non-ferrous materials should be used. Transformer vaults shall be constructed so as to contain fire and combustible liquids within the vault and to prevent unauthorized access. of the outer end of the raceway, measured along the sheath; The raceway extends directly above the enclosure and does not penetrate a structural ceiling; A fitting is provided on each end of the raceway to protect the cable from abrasion, and the fittings remain accessible after installation; The raceway is sealed or plugged at the outer end using approved means so as to prevent access to the enclosure through the raceway; The cable sheath is continuous through the raceway and extends into the enclosure not less than 6.35 mm (0.25 in.) If run as open conductors, they shall be fastened at ceiling height every 3.05 m (10.0 ft). An individual disconnecting means shall be provided for each motor, but a single disconnecting means may be used for a group of motors under any one of the following conditions: If a number of motors drive several parts of a single machine or piece of apparatus, such as a metal or woodworking machine, crane, or hoist; If a group of motors is under the protection of one set of branch-circuit protective devices; or. The disconnecting means shall plainly indicate whether it is in the open (off) or closed (on) position. An individual disconnecting means shall be provided for each controller. Unless installed in a continuous grounded metallic raceway or metallic covered cable, each branch circuit shall contain a separate equipment grounding conductor and all receptacles shall be electrically connected to the grounding conductor. Fixtures, lampholders, lamps, rosettes, and receptacles may have no live parts normally exposed to employee contact. Temporary service is defined as electric service to a site for less than one year. Municode - St. Petersburg Codes and Ordinances Website BS 7671 applies, not only to fixed installations, but also to temporary installations. %PDF-1.5 %���� 1/0 through 4/0 single conductor cables are installed in ladder cable tray, the maximum allowable rung spacing for the ladder cable tray shall be 229 mm (9 in. Display danger warning signs around the intake or enclosure. We believe you will find it helpful when planning new electrical installations, revamping old ones or adding additional equipment. Today I am going to share with you a picture of one of the most important parts of temporary electrical installations in construction works, that is the temporary supply sub-switchboard, distribution board and their cabling. Added for a customer-owned and installed underground service lateral, if a customer increases the service lateral length or load, the customer shall be responsible to verify that Any nonconductive paint, enamel, or similar coating shall be removed at threads, contact points, and contact surfaces or be connected by means of fittings designed so as to make such removal unnecessary. Flexible cords and cables shall be approved for conditions of use and location. In fact, there are as many different temporary power installations as there are contractors. Temporary wiring must meet the requirements of the National Electrical Code (NEC) and be installed and maintained by qualified persons that apply safe work practices in compliance with industry standards. Flexible cords and cables shall be protected from accidental damage, as might be caused, for example, by sharp corners, projections, and doorways or other pinch points. These provisions do not require overload protection that will stop a motor where a shutdown is likely to introduce additional or increased hazards, as in the case of fire pumps, or where continued operation of a motor is necessary for a safe shutdown of equipment or process and motor overload sensing devices are connected to a supervised alarm. The tubing shall be in continuous lengths not exceeding 4.57 m (15.0 ft) and secured to the surface by straps at intervals not exceeding 1.37 m (4.5 ft). Single-throw knife switches and switches with butt contacts shall be connected so that the blades are deenergized when the switch is in the open position. Open conductors shall be separated from contact with walls, floors, wood cross members, or partitions through which they pass by tubes or bushings of noncombustible, nonabsorbent insulating material. §4.10Changed section title to ‘High Rise Building Service’ with the requirement for customers to Consult the … This report summarizes the general requirements for temporary electrical wiring used at construction sites. The following requirements apply to capacitors installed on circuits operating at more than 600 volts, nominal: Group-operated switches shall be used for capacitor switching and shall be capable of the following: Carrying continuously not less than 135 percent of the rated current of the capacitor installation; Interrupting the maximum continuous load current of each capacitor, capacitor bank, or capacitor installation that will be switched as a unit; Withstanding the maximum inrush current, including contributions from adjacent capacitor installations; and. Know your responsibilities and other electric and natural gas service installation requirements BEFORE you begin a construction project. National Grid / Specifications for Electrical Installations/ 2020 an event where temporary electrical installation is to be used unless the Electrical Inspector is satisfied with its safety. a new temporary service. Where a fixture canopy or pan is used, any combustible wall or ceiling finish exposed between the edge of the canopy or pan and the outlet box shall be covered with noncombustible material. Temporary services are usually 120/240 volts, singlephase, 200 amperes. 2. h�b```f``Z���� ��A�X��,3����{�T��� U��vR$��s� GAv�I���00xttt00p ��� �����Z������e�g�u�5��k�丛y%�s�����,������b`������ɽ��nb`э����� L�np ��~H3�?� �50a But when it’s done right, the temporary power—as thankless as its installation sometimes seems—helps ensure a productive and safe work environment. Getting started Installing temporary new electrical service to a Oil-insulated transformers installed indoors shall be installed in a vault. with the type designation, size, and number of conductors. Here are the limits: 1. At one time, electricians would install temporary power or lighting under those looser Code requirements, and installations would be “temporary” on a permanent basis. An RCD or ELCB is to be installed to all final distribution boards and tested before use on each shift. Temporary wiring shall be removed immediately upon completion of the project or purpose for which the wiring was installed. If a group of motors is in a single room within sight of the location of the disconnecting means. Notes: 1. 1910.305 - Wiring methods, components, and equipment for general use. No bare conductors nor earth returns may be used for the wiring of any temporary circuit. All holders of Copies are available online at www.duke-energy.com. For series capacitors, the proper switching shall be assured by use of at least one of the following: Mechanically sequenced isolating and bypass switches; Switching procedure prominently displayed at the switching location. Act 1974 (HSAWA) The HSAWA places a duty on every employer to ensure so far … Motors, motor-control apparatus, and motor branch-circuit conductors shall be protected against overheating due to motor overloads or failure to start, and against short-circuits or ground faults. However, blades and terminals supplying the load of a switch may be energized when the switch is in the open position where the switch is connected to circuits or equipment inherently capable of providing a backfeed source of power. Temporary electrical wiring at construction sites should comply with the requirements of OSHA, NEC, and local codes. : branch circuits shall originate in an approved power outlet or panelboard conditions of use and location within the and. 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