Acceptable types of wire for this application are given in Table 400.4, which occurs in an earlier chapter and lists various types of elevator cable for lighting and control in both unclassified and hazardous locations. Traditionally, the electrical system design engineer has given little attention to the elevator controller. For example, it is stated that the cross-sectional area of the individual conductors in a wireway are not to exceed 50% of the interior cross-sectional area of the wireway. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. While the definitions are straightforward, their deployment in real-life building projects involves enormous legal and moral implications, given the fact that we are carrying large numbers of people hundreds of feet above the earths surface on a daily basis. PDF C.1 General Requirements for All Elevator Installations Every building is different. Elevator Pit Requirements | Mike Holt's Forum from components that are not otherwise guarded. This strategy works to improve the flexibility of the traveling cable, but it is contrary to a general NEC rule concerning the paralleling of conductors, which is generally done in very large sizes to avoid unwieldy wire pulls and terminations. ), a duplex 15A 120-volt receptacle in pit with ground- fault circuit protection and a 15A 120-volt Non GFCI receptacle for the sump pump. First, the ATS signals the elevators that it's about to switch over to emergency power preferably 30 sec or more prior to switching, which allows the elevator controller to bring each elevator cab to the nearest landing and stop, thus protecting the motors and electrical system. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. The main impetus for the creation of the NEC in the closing years of the 19th century was the collective anguish experienced by insurance underwriters who were losing vast amounts of money due to liability and physical damage claims resulting from Edisons electrification of, first, Lower Manhattan and then the world. The traveling cable, of necessity, is exempted. And as the designer, you can become the fulcrum on which all of these requirements and authorities exert their leverage, but an understanding of elevator basics can help you handle the pressure. It begins by considering metal and nonmetallic wireways. For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. Years may lapse between the design and installation stages of a project. A traditional elevator installation (which includes a machine room) requires access inside the elevator shaft. [emailprotected] Get more of Elevator World. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. ranged from 0.06 cal/cm2 to 0.95 cal/cm2, which indicates that the arc-flash hazard to employees is primarily to the hands and arms. For platform lifts and stairway chairlifts, the duty is intermittent. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. Many undertake trips in these devices two or more times daily in full confidence that they will survive an uneventful experience with a minute chance of disaster or even inconvenience. Second, it must be configured so as to eliminate any chance of tangling or chafing against the inner surface of the hoistway or items mounted on it. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. He had been with Eaton (Cutler-Hammer and Bussmann) since 1993 and specializes in training on the design and application of overcurrent protective devices and equipment in electrical distribution systems in accordance with the National Electrical Code and equipment in accordance with the various product standards. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. Section 725.45 concerns the location of overcurrent devices and provides for feeder and branch-circuit taps, transformer primary side overcurrent device location and overcurrent device location at the input side of electronic power sources. He participates in IEEE (Senior Member) with Industrial and Commercial Power Systems, NEMA (member of the Codes & Standards Committee), NFPA (committee member for NEC CMP-13 and NFPA 79), UL (508/60947 and 508A) and IAEI activities. %PDF-1.5
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Sign up for our free e-newsletter. f?3-]T2j),l0/%b This may be countered by providing good machine-room ventilation. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. Within cars, these additional wiring methods are permitted: The following additional wiring methods are permitted on the car assembly in lengths not exceeding 6 ft.: Within machine rooms, these additional wiring methods are permitted: The following wiring methods are permitted on the counterweight assembly in lengths not to exceed 6 ft.: Having looked at NEC 2011 mandates for elevator and related equipment installations, we will cover wiring methods, overcurrent protection, grounding and other related NEC provisions in part two of this series , running in the April 2012 issue of ELEVATOR WORLD. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . As for height, the working space must extend from the grade, floor or platform to 6-1/2 ft. or the height of the equipment, whichever is greater. We generally think of the 19th century as the great age of building codes. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. NEC Article 620: Elevators, Part 2 - Elevator World, Inc. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. You are seeing this message for one of three reasons: You have reached your limit of free content. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. The two main types of elevators are hydraulic and traction. [emailprotected] Other building loads, such as power and lighting, may function as the energy absorbing means, provided these loads are automatically connected to the emergency or standby power system operating the elevators and large enough to absorb the regenerative power. Sumps and sump pumps in pits, where provided, shall be covered. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. Something went wrong. David Herres holds a New Hampshire Master Electricians license and has worked as an electrician in the northern part of that state for many years. With these new NEC requirements, there is now the potential that an elevator controller SCCR may be required thats higher than what elevator manufacturers have historically furnished. If your specifications require a vent at the top of the shaft for venting smoke, you must provide a key switch with a pilot light to control that vent. Something went wrong. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. +91 8025357028, 2022 Elevator World, LLC. In some cases, it may require a means to test the shunt trip operation or have one contact operate the shunt trip of more than one elevator. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U
^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ As greater numbers of elevators are added, the likelihood of them all operating simultaneously decreases so that it is permissible to reduce the feeder ampacity. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. One. The fan should be on a dedicated circuit. Such vehicles include, but are not . A different occurrence involves exposure to the explosive blast when there is a line-to-line or line-to-ground arc blast. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. Hard-service cords and junior hard-service cords are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. In contrast to the lighting, these receptacles must be connected to GFCI devices. 354 Morgan Ave. PDF Elevator Acceptance Inspections - Tennessee Additional requirements concern escape routes. Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. A little more narrowly focused (yet of great consequence) is the ubiquitous NEC, which, in the National Fire Protection Association (NFPA)s venerable Handbook edition, devotes 18 double-column pages to electrical design and installation requirements for elevators, escalators and related equipment. Many NEC articles address voltage limitations, and Article 620 is no exception. The basic wiring methods are rigid-metal, rigid nonmetallic or intermediate-metal conduit; electrical metallic or rigid nonmetallic tubing; wireways; or Type MC, MI or AC cable, unless otherwise permitted. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. z, /|f\Z?6!Y_o]A PK ! Conductors supplying a single power transformer are to have an ampacity not less than the nameplate current rating of the power transformer plus all other connected loads. Loss of voltage to the control circuit for the disconnecting means shall cause a supervisory signal to be indicated at the control unit and required remote annunciation. The next section, 620.36, concerns different systems in one raceway or traveling cable. Heating and air-conditioning equipment located on the car must not be in excess of 600 V. All live parts of electrical apparatuses are to be enclosed to protect workers and the public against accidental contact. Car lighting, receptacles and ventilation 2. Design practices that are acceptable in some jurisdictions may not be in others. For elevators that regenerate power back into a power source unable to absorb the regenerative power under overhauling elevator load conditions, a means to absorb this power is to be provided. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) The Code provides guidance through regulations to establish requirements. If the entire feeder/branch circuit assembly were to be protected in the conventional manner, the motor would cut out long before reaching operating speed. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. However, this can vary depending on building conditions and exterior grade. These selective coordination tables for current-limiting fuses show the minimum amp ratio required between a pair of fuses of a given type(s) to achieve selective coordination. As they review the plans and the construction site, they may have conflicting interpretations or requirements. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. APPENDIX A 2.2. Main feeders that supply elevator power must be kept outside the hoistway unless one of the following applies: Feeders for elevators are permitted within an existing hoistway (provided they are not spliced within the hoistway) by special permission of the AHJ. You are a subscriber that needs to Sign In. Part VII, Overcurrent Protection, divides this topic into four categories for elevators and similar equipment, depending upon the nature of the specific equipment: For operating devices and control and signaling circuits, protection against overcurrent is in accordance with the requirements of Sections 725.43 and 725.45. Liquid-tight flexible nonmetallic conduit, Flexible cords and cables, or conductors grouped together and taped or corded, are permitted without raceway, where they are part of listed equipment, a driving machine or a driving-machine brake, Flexible metal conduit, liquid-tight flexible metal or nonmetallic conduit, 3/8 in. Elevator Pit Sump Pump Electrical Requirements Instruments: Use category III multimeters and be familiar with their use and limitations. Notwithstanding, if sprinklers are installed in hoistways, machine rooms or the like, the disconnecting means is permitted to automatically open the power supply to the affected elevator(s) prior to the application of water. The electrical system designer calculates the maximum available fault current at the elevator controller. Use Underwriters Laboratories or Canadian Standards Association-labeled scopes tested for 1,000 V. Lockout/tagout: When troubleshooting is complete and further work can be accomplished without the equipment being energized, follow the lockout/tagout procedures in Section 7 of the. Generally, it is decreed that the supply voltage is not to exceed 300 V between conductors (allowing for the familiar 240-V concept), although there are exceptions. After reading this article, you should have learned: Which locations require sepa-rate, dedicated branch circuits Which branch circuits are not to be provided with ground fault circuit interrupter (GFCI) pro-tection Which locations must have one or more duplex receptacles Where overcurrent protection for hoistway, pit and machine-room lighting must be located How unsupported lengths of traveling cables are measured. It is important for design engineers to communicate this with the architect and owner during the design phase, as it will impact space needs elsewhere in the facility to accommodate electrical equipment. Part IX, Grounding, states that metal raceways, Type MC cable, Type MI cable or Type AC cable attached to elevator cars are to be bonded to metal parts of the car bonded to the equipment grounding conductor. Besides the initial determination requirement of paragraph (c) (1), the "host" employer must comply with the five (5) requirements of paragraph (c) (8) when engaging another employer (contractor) who will have employees in permit spaces under the control of the host employer. The main concern is to ensure that workers may escape to safety in the awful circumstance of an arc-fault event. NEC articles generally adhere to a template, which greatly aids in navigating and quickly locating mandates as needed for project design or, on an installation level, in the field. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. Cross-sectional areas of wireways are found by multiplying the two interior dimensions.) The reason the NEC CMP 12 added these requirements, as shown in the panel statements, directly relates to the concern that elevator controllers can be installed in locations where the available fault current can be high and the inspector may not be able to clearly determine the SCCR of the elevator controller unless it is marked on the equipment. PDF Q.When and where are GFCI's required by the NC Electrical Code Proper selective coordination in a multi-elevator installation on the same feeder ensures if one elevator develops a fault, the other units will not be shut down. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. The code exempts some fairly broad areas where compliance is not expected. +90 (216) 348 4876, India Office Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. Where necessary, it is mandated that suitable guards be provided to protect the cables against damage. Elevator PITS | Mike Holt's Forum But by understanding how these items fit together and what purpose they serve, you can have a successful project. No provision is to be made to automatically restore power. Selective coordination is defined by the NEC as: Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents.. The hazards are external to the equipment enclosure since equipment SCCR testing and evaluation criteria for product standards are most often performed with the enclosure doors closed and latched, and the fault occurring external to the enclosure. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. You are seeing this message for one of three reasons: You have reached your limit of free content. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. We shall now take a look at the principle requirements of Article 620, with particular emphasis on wiring requirements for elevator shafts, machine rooms and cars. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. Machine room-less elevator installations incorporate the elevator controller and often the primary disconnecting means in a convenient package that is located within the elevator shaft. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Thus, the traveling cable must be supported by a steel supporting member. The idea is quite simple. It is further specified the machine-room lighting switch be located at the point of entry. With the elevator car at the bottom landing, it is the length of cable as measured from the point of suspension in the hoistway to the bottom of the loop. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. The light switch shall be located so to be accessible from pit access door. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. If elevators are supplied by the emergency, legally required standby or critical operation power systems, then selective coordination is required per the 2017 NEC in 700.32, 701.27 or 708.54. Hoistway pit lighting and receptacles 5. from the exposed components, and the incident energy calculated at 18 in. They must be in enclosures with doors or removable panels that can be locked in the closed position. Flexible cords and cables in lengths not to exceed 6 ft. of a flame-retardant type and located to be protected from physical damage are permitted in machine rooms without being installed in a raceway. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. Requirements in Article 620 modify the articles in Chapter 3. 836 Troy Schenectady Road ; Latham, NY 12110 . It states an elevator is permitted to be run by an emergency or standby power system. The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. 836 Troy Schenectady Road Latham, NY 12110 . Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. : inspecting; troubleshooting; observing; etc.) Many of these are for portable lighting.). These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. 974 0 obj
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Selective coordination is also required for multiple elevators per NEC 620.62. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. +1-251-479-4514 | [emailprotected], Trkiye Office You are a subscriber that needs to Sign In. 23.254.250.15 You need to Subscribe to continuing reading. Your Quick and Easy Elevator Code Checklist | Kings III 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. (f) Illumination of Pits. The Uniform Building Code requires two-way communications between the central command center and the elevators, each elevator lobby, emergency power rooms, and by entries into enclosed stairways (Section 403.5.3). Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor With heavy use on a hot day, the oil can overheat, causing elevator shutdown. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. My reasoning comes from 620.24 (A) and (C). NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. These are the principle NEC 2011 Article 620 mandates. GFCIs in elevator pits During an inspection of the elevators in a commercial building, the state inspector failed us for using a GFCI-type circuit breaker to protect a receptacle in the elevator pit. Here are 23 ways that both chapters and the national office can meet todays major challenge of making members feel valued, IAEIs Online Training allows you to learn at your own pace or live with an expert instructor, from the comfort of your laptop or PC. Requirements for commercial garages per the National Electrical Code. Use the below learning-reinforcement questions to study for the Continuing Education Assessment Exam available online at www.elevatorbooks.com or on page 111 of this issue. Name the principal code other than NEC that pertains to elevator design/installation. What is the definition of the machine room? Why are voltage limitations important? In which areas must live parts be enclosed? Why are feeder demand factors permitted for multiple elevators? In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. These 29 CFR 1910.146 (c) (8) requirements are: Pit light with guard (ten foot candles min. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. Mohawk Lift Systems Inc, 836 Troy Schenectady Rd, Latham, NY, Elevators After such an event, it is important that the affected worker is able to escape the area and get to help. Part X, Emergency and Standby Power Systems, is simple and straightforward. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. Section 620.37 re-emphasizes that only wiring used in connection with the elevator is permitted within the hoistway, machine room, control room/machinery space or control space. It is noted that the article covers the installation of electrical equipment and wiring for elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts.