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You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. 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. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. 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. 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. Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. wide or the width of the equipment, whichever is greater. As they review the plans and the construction site, they may have conflicting interpretations or requirements. (All intentionally grounded elements must be held at equal potential.) above the pit floor, shall: Be weatherproof (NEMA 4). [emailprotected] The conduit alone can't act as the grounding means. Beginning with Article 320, Armored Cable (Type AC) and concluding with Article 398, Open Wiring on Insulators, each code-sanctioned cable and raceway is treated, ranging from the familiar Type NM (trade name Romex) to the exotic Integrated Gas Spacer Cable (Type IGS). Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. 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. You are seeing this message for one of three reasons: You have reached your limit of free content. 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. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. : inspecting; troubleshooting; observing; etc.) 2. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. NEC Article 620 Part IV, Installation of Conductors, contains key mandates for elevator wiring. Jul 15, 2021. 23.254.250.15 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. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. tC|[S9G?+uJP>&/TOy o PK ! Part VIII, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces, states elevator and similar-installation driving machines, motor-generator sets, motor controllers and disconnecting means are to be installed in a room or space set aside for that purpose. 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. 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. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. from the exposed components, and the incident energy calculated at 18 in. A clean and dry elevator pit and machine/control room provided (ASME A17.1 Rule 2.1.2) Machine/control room meets manufacturer's requirement of preserving ambient temperature control and humidity (ASME A17.1 Rule 2.7.9) Elevator floor covering installed with appropriate smoke and flame spread (ASME A17.1 Rule 2.14.2) Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. Furthermore, at least one 125-V, single-phase, 15- or 20-amp duplex receptacle is to be provided in each machine room or similar location. It is conditionally provided that fiber-optic cables and conductors for operating devices, operation and motion control, power, signaling, fire alarm, lighting, heating and air-conditioning circuits of 600 V or less are permitted to be run in the same traveling cable or raceway system. 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. In addition, the shunt-trip voltage must also be monitored by the Fire Alarm System. Home Articles Elevator World June 2012 Issue NEC Article 620: Elevators, Part 2. Notice the definition mentions the full range of operating times. The architect has a choice of either traction or hydraulic elevators. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. 836 Troy Schenectady Road ; Latham, NY 12110 . All rights reserved. 354 Morgan Ave. In Part One of this series (ELEVATOR WORLD, April 2012), we began an examination of National Electrical Code (NEC) 2011 mandates for elevators and related equipment installations. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. When you're designing an electrical system for a building, don't let elevator requirements bring you down. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. charlie b. The elevator rails, like the ground system of the entire building electrical structure, are to be bonded to the lightning-system ground electrode so these all remain at the same potential even during a lightning event, ensuring side flash does not occur. 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. proved for elevator locations - car, hoistway, pit and a-chine roo equireents in Article odify the articles in Chap - ter For eaple, it is stated that the cross-sectional area [emailprotected] The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. 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. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. 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. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. 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. One. But the lights don't have to be in the pit itself. The proposals resulted in adding new requirements in the 2017 NEC for: Marking the elevator controller short-circuit current rating (SCCR) by the elevator control-ler manufacturer. (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). It is further specified the machine-room lighting switch be located at the point of entry. Doors must open in the direction of travel and be equipped with panic bars, pressure plates or other devices that are normally latched but open under simple pressure. Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. The two main types of elevators are hydraulic and traction. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). 3. Each of these performs a different function, and the wiring mandates vary accordingly. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. 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. This is something that can be easily accomplished if the elevator controller manufacturer uses components in combination with overcurrent protective devices that are tested and listed with high combination SCCRs. 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. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. In case of emergency, electricians, maintenance personnel and any elevator technicians called in to the premises should have ready access to the key. +1-251-479-4514 | [emailprotected], Trkiye Office For just $7.99 per month, you can gain access to more than 5,000 articles from all Elevator World Publications, this includes EW Global, EW Europe, EW India, EW Middle East, EW Turkey, and EW UK. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. %%EOF And so the needs can be very different. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. 3. In many cases, the overcurrent protective devices that are suitable for this level of protection are current-limiting fuses rather than a traditional circuit breaker. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. He had been with Eaton (Cutler-Hammer and Bussmann) since 1993 and specializes in training on the design and application of overcurrent protective devices and equipment in electrical distribution systems in accordance with the National Electrical Code and equipment in accordance with the various product standards. He has focused on writing since 2006, having written for such magazines as ELEVATOR WORLD, Electrical Construction and Maintenance, Cabling Business, Electrical Business, Nuts and Volts, PV Magazine, Electrical Connection, Solar Connection, Solar Industry Magazine, Fine Homebuilding Magazine and Engineering News. Specifically, Section 725.43 provides that overcurrent protection for conductors 14 AWG and larger is to be provided in accordance with the conductor ampacity without applying ampacity adjustment and correction factors. N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ Reinforcing NEC 110.3(B) and NEC 110.10 to require the elevator controller marked SCCR to be equal to or greater than the calculated and David Herres In a time when increasing value is placed on even small amounts of real estate, elevator design must strive to configure, efficiently control and drive elements to whatever degree possible, and that is the thinking behind some alternate locations for these structures. Additionally, ampacities of the individual conductors and flame-retardant properties of the overall cable are important factors. Pit light with guard (ten foot candles min. 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. This is somewhat broader than A17.1-2007/B44-07. z, /|f\Z?6!Y_o]A PK ! Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. 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. When you consider that an elevator is an enclosed room with one or more doors that people voluntarily enter so they may travel hundreds of feet up or down, several observations are in order. Fuses: Verify that the correct size, type and capacity are installed. 2023 Endeavor Business Media, LLC. Feeder and branch-circuit conductors are required to have specified ampacities: Feeder conductors of less ampacity are permitted for group installations and quite common in elevator work. Dont troubleshoot unless you can keep your shoe/boot soles dry. 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. Suspending the cables from the supports by a means that automatically tightens around the cable when tension is increased for unsupported lengths up to 200 ft. An NEC Informational Note defines unsupported lengths. APPENDIX A 2.2. 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. 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. 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. Thus, the traveling cable must be supported by a steel supporting member. This website is using a security service to protect itself from online attacks. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. The lighting switch shall be located so as to be readily accessible from the pit access door. 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. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. Years may lapse between the design and installation stages of a project. ), advise the building owner to correct the condition. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position.