Get more of Elevator World. A further requirement concerns elevator-car air-conditioning and heating. 1. It is further specified the machine-room lighting switch be located at the point of entry. 23.254.250.15 In an elevator machine room, where space may be limited in the first place, the working-space mandate must be factored in very early in the design process lest an unthinkable amount of rework be necessary. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. These requirements, found in Article 620 (part of Chapter 6, Special Equipment), are in addition to NEC Chapters 1-3, which stipulate general wiring protocols applicable in most residential, commercial and industrial venues. wide or the width of the equipment, whichever is greater. Also located in this room might be, but not limited to: exhaust fan, cooling unit (depending on local requirements and/or requirements set forth by the individual elevator supplier), lighting, voice and/or data drop serving the elevator cab emergency phone, elevator controller primary fused disconnect, elevator feeder shunt-trip circuit (i.e., shunt-trip circuit breaker), elevator cab lighting fused switch, and convenience receptacle(s). These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. This room is to be secured against unauthorized access (kept locked). Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. If the smoke detector at the designated landing goes into alarm, the elevator will stop at a predetermined alternate floor, which is usually the floor above the designated floor. When the elevator car is at the top landing, it is the length of cable as measured from the point of suspension on the car to the bottom of the loop. In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. charlie b. It is further stated that the disconnecting means are not to disconnect the branch circuits required in sections 620.22, 620.23 and 620.24. Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. Therefore, elevator equipment rooms must maintain a temperature between 50F and 90F. Traction elevators are typically installed in a bank of elevators where fused switches, or circuit breakers in a panelboard are located in the machine room serving the bank of elevators. Elevator Pit Sump Pump Electrical Requirements By Nat July 30, 2022 Bulls Eye (Simplex) Receptacles: Bulls eye (simplex) receptacle for Sump pumps (now not - GFI) on a delegated circuit will be required in all elevator pits for the elevator pit sump pump. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. NEC has a further note that the term wheelchair lift has been changed to platform lift.. tC|[S9G?+uJP>&/TOy o PK ! See Section 3 of the. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. Similarly, underground wiring in mines is not NEC regulated, although other, non-mine wiring below ground (such as lighting in an underground traffic tunnel) is covered. Car lighting, receptacles and ventilation 2. Article 511 provides the requirements for commercial garages areas used for the storage or repair of self-propelled vehicles that use combustibles (liquid or gas) for power. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. If a smoke detector goes into alarm, it signals the elevator to go into Fire Recall Function, at which point the controller directs the elevator cab to travel to its pre-programmed designated landing, open its doors, and remain stopped there until the alarm clears. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. It is of great importance that power to the various elevator functions can be quickly and reliably removed from the loads in case of emergency or for maintenance and troubleshooting. GET YOUR CEUS TODAY, 1998-2021. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. Conductors supplying a single motor are to have an ampacity not less than the percentage of motor nameplate current determined from Section 430.22(A) and (E). Supports for cables or raceways in a hoistway or in an escalator or moving-walk wellway or platform lift and stairway chairlift runway must be securely fastened to the guide rail, escalator or moving-walk truss, or to the hoistway, wellway or runway construction. 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. The Americans with Disabilities Act Accessibility Guidelines for Buildings and Facilities (ADAAG) now require the cab to have a special phone accessible by individuals with disabilities. NEC Article 0: Elevator art by David Herres Continued. or larger, not over 6 ft. in length. All of these options and special wiring can be challenging depending upon the location of the shunt trip circuit breaker as well as who has responsibility for providing these additional options. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. Choose topics from a full list of courses covering electrical topics that cover what you need to know from the NEC and other electrical codes and standards. Granle is a licensed professional engineer with Sebesta Blomberg & Associates, Rochester, Minn. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/, ABCs Construction Backlog Indicator Down to Start 2023, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? David Herres We generally think of the 19th century as the great age of building codes. Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. +1-251-479-4514 | [emailprotected], Trkiye Office This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. You need at least one 120VAC GFCI-protected receptacle at each location. Other codes and standards interact with the NEC, and it is necessary to see how they all work together in order to create safe and compliant elevator designs/installations. The disconnecting means is also to be a listed device. Car air-conditioning and heating units 3. 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? NEC Article 620 covers elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairlifts. Mobile, AL 36606 USA Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. It is further stipulated that internal voltages of power-conversion equipment and functionally associated equipment, and the operating voltages of wiring interconnecting the equipment, are permitted to be higher, provided that the equipment and wiring are listed for the higher voltages. Convenience receptacles and lighting for maintenance purposes are required at the base of the pit and, in some instances (elevator manufacturer dependent), at the top of the elevator shaft. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. employees shall not perform any work on equipment where there is a potential to come in contact with energized mechanical or electrical hazards until all sources of energy have been de-energized, grounded or guarded.. All rights reserved. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. This is somewhat broader than A17.1-2007/B44-07. 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. One way to achieve this is by paralleling wires, i.e., connecting the runs at both ends so they are physically like two wires but electrically one. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. Flexible cords and cables that are components of listed equipment and used in circuits operating at 30 V (42 VDC) or less are permitted in lengths not to exceed 6 ft., provided the cords and cables are supported and protected from physical damage and are of a jacketed and flame-retardant type. %%EOF It is important to note, that these selective coordination tables can indicate a lack of selective coordination at a given fault current for circuit breakers that do not show overlap on the time-current curves of the circuit breakers. This position paper is written to provide guidance to members whose employees are engaged in elevator-industry work that might expose them to arc-flash hazards, and to assist members in complying with applicable OSHA and National Fire Protection Association (NFPA) standards. 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. Because they need to move and flex, traveling cables are not required to be in a raceway. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. However, this can vary depending on building conditions and exterior grade. Conductors supplying a single motor controller are to have an ampacity not less than the motor controller nameplate current rating plus all other connected loads. No provision is to be made to automatically restore power. The new ADAAG guidelines now require that emergency power be available to elevators that have four or more stories of travel above or below the accessible floor [4.1.3(9)(1)]. If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . 354 Morgan Ave. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc 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. 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. The simplest option is to use a shunt trip circuit breaker in either the feeder supplying the elevator or the elevator disconnect. The party responsible for procuring the elevator control panel must state the minimum acceptable SCCR or the maximum available fault current where the controller will be installed. 2m9 `K]f*F gaR Similarly, the integrity of the traveling cable is emphasized. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. The usual scenario for electrical injury is shock when electrical current passes through the human body. Finally, in 1897, the first National Electrical Code (NEC) appeared. Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. The two documents are in harmony and should be used in conjunction. [emailprotected] 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 floor specified as the designated landing, which must be approved by the Fire Marshal, is usually the floor on grade level so passengers can quickly exit to the outside. After such an event, it is important that the affected worker is able to escape the area and get to help. 953 0 obj <> endobj A surge of immigration to the U.S., the end of slavery and, on both sides of the Atlantic Ocean, a burgeoning industrial revolution ignited an acceleration in new building. Follow the manufacturers instructions and precautions. Where a feeder powers more than one elevator, you need selective coordination; the OCPDs must be series-designed so a fault at one of the elevators will be cleared by only the OCPD serving it. 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. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. Regardless of the number of elevators, only one smoke detector is required at each floor lobby, but it must be located within 21 ft of every elevator door. 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. 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. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. The elevator controller manufacturer must determine the required elevator controller SCCR as stated in the elevator controller specification and provide an elevator controller SCCR that is equal to or greater than the available fault current thats indicated in the design documents where there are multiple elevator controllers at different locations. 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. Per the 2017 NEC, if the elevator is designated as an emergency system load, the disconnect must be protected by a surge protective device (SPD). The Code provides guidance through regulations to establish requirements. 2.2.2.6 . For example, wiring that is under exclusive utility control and has to do with the generation and distribution of electrical power is not NEC regulated. Because of this, several manufacturers offer an all-in-one shunt trip elevator disconnect switch that includes all the prewired accessories needed to comply with the various Code sections. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. You may go up to 600 V for power circuits supplying door-operator controllers and door motors, branch circuits and feeders to motor controllers, driving-machine motors, machine brakes and motor-generator sets. 2023 Endeavor Business Media, LLC. 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. Thus, the need for door interlock functionality is recognized. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. Dec. 21, 2010. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ The light switch in the pit must be mounted 42 in. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. Such design innovations require sophisticated wiring strategies. This is the area within the hoistway beneath the car, and there are occasions when elevator technicians have to work in this area for maintenance and troubleshooting. Dan Neeser is a Senior Field Application Engineer with Eatons Bussmann Division. Accordingly, for this application, the minimum size is reduced to 20 AWG for lighting circuits. They are permitted to be run without raceway when used inside the hoistway, on the elevator car, hoistway wall, counterweight, or controllers and machinery located inside the hoistway, provided they are in their original sheaths. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. Many NEC articles address voltage limitations, and Article 620 is no exception. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. The traveling cable or raceway is also permitted to include shielded conductors and/or one or more coaxial cables. 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. Smoke detectors, which are required in all elevator lobbies and elevator equipment rooms, must be connected to the elevator controllers directly by means of auxiliary contacts and wiring, or indirectly by means of output signals from the fire alarm control panel. 988 0 obj <>stream Many of these are for portable lighting.). Hydraulic elevator installations are typically supplied from the main switchboard and have an elevator fused switch or circuit breaker in the machine room that serves as the elevator disconnect. The demand factor ranges from 1.00 for one elevator on a single feeder to 0.72 for 10 or more elevators on a single feeder. or larger is permitted to be installed in lengths in excess of 6 ft. Where motor-generators, machine motors or pumping-unit motors and valves are located adjacent to or underneath control equipment and provided with extra-length terminal leads not exceeding 6 ft. in length, such leads are permitted to be extended to connect directly to controller terminal studs without regard to carrying-capacity requirements. All elevator hoistways must be equipped with a sump pit located at the rear of the elevator pit. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. Adhering to the requirements will ensure a hazard-free electrical installation. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. Hoistway pit lighting and receptacles 5. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). It is important for the design engineer to coordinate with the architect to determine the elevator manufacturer basis of design to determine if and when additional power and lighting is required. Regardless of the number of elevators, only one smoke detector is required at each floor lobby, but it must be located within 21 ft of every elevator door. This is not the elevator companys responsibility. Pits shall be maintained in a clean and dry condition. Luminaires must be lensed or equipped with wire guards to protect the lamps. 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. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. Fluid pressure in the cylinder raises and lowers the elevator cab. Requirements in Article 620 modify the articles in Chapter 3. High-rise buildings pose additional concerns. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. When you're designing an electrical system for a building, don't let elevator requirements bring you down. (g) Stop Switch in Pits. Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. Besides the power-supply disconnect discussed, it is provided that elevators have a single means for disconnecting all ungrounded car lights, receptacles and ventilation power-supply conductors for that elevator car. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. C.1.4 ELEVATOR PIT REQUIREMENTS 1. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P +90 (216) 348 4876, India Office NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. The cover shall be secured and level with the pit floor. Fireman telephone jacks and telephone cabling are typically sufficient for each of these locations. This may be countered by providing good machine-room ventilation. For all of this to come together in the real world, there had to be some assurance that these new technologies could be used safely on a wide scale. An example would be the elevator, as well as all wiring in a utility-owned administration building. 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. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. Bonding of elevator rails to a lightning-protection system grounding conductor is permitted, but the conductor itself is not to be located in the hoistway. 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. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. !>x=yy Bvv8?~e PK ! However, when I've put in elevators, NEC seems to always take a back seat to ANSI, which seems . 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. Your IP: In order to comply, the electrical system designer must determine the maximum available fault current at the elevator disconnecting means and assure the elevator disconnecting means overcurrent protective device will clear any overcurrent condition, up to the maximum available fault current, before any upstream overcurrent devices will operate. 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. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. It is mandatory, as in the car, that these items have a separate, dedicated branch circuit, and the required lighting is not to be supplied through a GFCI. 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. The disconnecting means is to be an externally enclosed, operable, fused motor circuit switch or circuit breaker capable of being locked in the open position. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). Each of these performs a different function, and the wiring mandates vary accordingly. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. All Rights Reserved | Contact Us | Privacy Policy. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. z, /|f\Z?6!Y_o]A PK ! IAEI News Magazine. Years may lapse between the design and installation stages of a project. The NEC rule specifies that the minimum size for paralleled conductors is 1/0 AWG, which is much too big for an elevator traveling cable. The basic rule for conductor fill of a metal wireway, as given in Article 376, is that the sum of the cross-sectional areas of all contained conductors at a cross section of a wireway is not to exceed 20% of the interior cross-sectional area of the wireway. All equipment in a machine room-less design is installed within the elevator shaft or exterior compartment near the elevator shaft, including the elevator controller and the elevator disconnecting means. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. Weight (passengers, freight, car and attendant machinery) may be fairly substantial, and speed is significant. The action you just performed triggered the security solution. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. Of particular importance is the location of the disconnecting means so it can be found by an individual who may not be familiar with the installation. 6 Stop Switch in Pits There shall be installed in the pit of each elevator an ASME A17.1 CODE enclosed stop switch or switches meeting the requirements The following material is reprinted with permission from the American of 2.26.2.7 and 2.2.6.1 through 2.2.6.3.
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nec elevator pit requirements