Many professionals believe the NEC is applicable only for voltages over a certain level, but that is not the case. The idea is quite simple. 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. David Herres ELECTRIC PASSENGER & FREIGHT ELEVATORS ASME A17.1 2004 Electric Elevator Checklist 2004 Multi-car.doc Page 4 of 44 Page Completed for cars : - Last Updated: 8/1/05 Car Enclosure Electric 2.14 - Hydraulic 3.14 A17.1 (A17.2) COMMENTS CARS 1-6 Operating Control Devices ADA Requirements Other terms defined in NEC Article 620 are Control System, Motion Controller, Motor Controller, Operation Controller, Operating Device and Signal Device. Dont troubleshoot unless you can keep your shoe/boot soles dry. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. 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. You need to Subscribe to continuing reading. 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. Hoistway door interlock wiring from the riser must be flame retardant and have insulation suitable for a temperature not less than 200C (392F), much higher than that required for most raceway or cable applications. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. 836 Troy Schenectady Road Latham, NY 12110 . 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. This is because the material may contribute fuel to a fire that has originated elsewhere. 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. 2m9 `K]f*F gaR Motor controllers are permitted outside the spaces specified above. (A) tells us that the lighting and receptacle (s) for the pit must be on separate circuits. Many of these are for portable lighting.). Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. It is stated that traveling cables are to be suspended at the car and hoistway ends, or counterweight end where applicable, so as to reduce the strain on the individual copper conductors to a minimum. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). It provides that where more than one driving-machine disconnecting means is supplied by a single feeder, the overcurrent protective devices in each disconnecting means are to be selectively coordinated with any other supply side overcurrent protective devices. 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. z, /|f\Z?6!Y_o]A PK ! If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. This switch will ensure that the elevator won't descend into the elevator pit and allow maintenance people to work safely in the area beneath the cab. 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.. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. +90 (216) 348 4876, India Office 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. h-`7 For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. The lighting switch shall be located so as to be readily accessible from the pit access door. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). If you specify a rescuvator, you must also specify a disconnect switch with an auxiliary contact that opens when the disconnect arm moves to the open position, but stays closed when the OCPD trips. 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. 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. 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. Part III, Wiring, looks at the types of wiring that may be installed in hoistways, cars, machine rooms and related spaces. 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. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. Thus, the traveling cable must be supported by a steel supporting member. 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. Traditional wiring methods and materials come into play, as always, but it is necessary to rethink their deployment. Pits shall be maintained in a clean and dry condition. You must locate this key switch at the main lobby or at the building fire command center. 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. 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 Notice the definition mentions the full range of operating times. Pit drainage must be designed to eliminate a minimum capacity of 3,000 gallons per hour (or 50 GPM) per elevator car. These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. NEC specifies Hoistway wiring, and doesn't seem to distinguish between hoistway and pit. High-rise buildings pose additional concerns. 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. You need to Subscribe to continuing reading. 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. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. If you provide your elevators with emergency power, you must run communications wires between the automatic transfer switch (ATS) and the elevator control panel. Fuses: Verify that the correct size, type and capacity are installed. The light switch in the pit must be mounted 42 in. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. To safeguard the passengers and electrical equipment, ASME A17.12.8.2.3.2 requires the power source to the elevator control panel to shut down prior to the discharge of water from a sprinkler head. of the sprinkler heads. 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. Examples of PPE that may be appropriate are non-conductive eye protection, clean leather or fire-resistant gloves, and natural-fiber or fire-resistant-rated long-sleeved shirts and pants, or fire-resistant-rated long-sleeved coveralls. The elevator pit discharge system is not required to include an oil separator, except as required by section 1003.4. But the lights don't have to be in the pit itself. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. 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. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . The disconnecting means is to be located adjacent to or an integral part of the motor controller. from components that are not otherwise guarded. NEC Article 0: Elevator art by David Herres Continued. 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. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. 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. Another location that requires a separate branch circuit for lighting and receptacle(s) is the hoistway pit. They are to be part of listed equipment, a driving machine or a driving-machine brake. 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. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. 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. Because they need to move and flex, traveling cables are not required to be in a raceway. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. 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. Elevator power disconnect (with utility feed marking) located in the machine room or other permitted location. Because of this, there is often a communications gap between the electrical system designer, whose design typically stops at the required elevator disconnecting means, and the architect who designs the elevator system. Article 620 follows this pattern by opening, in Section I, General, with a statement of scope and definitions applicable to the topic under consideration. 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. NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. 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. Cross-sectional areas of conduits are given in Chapter 9, Table 4. On existing or listed equipment, conductors are permitted to be grouped together and taped or corded without being installed in a raceway. 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. hb``` ea``j~p2nfH 'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu `h`R 1y 0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. Below is a summary of these new 2017 NEC sections: In order to comply with these requirements a chain of events must occur. Please check your entries and try again. The basic idea is that there must be a separate, dedicated circuit for car lights, receptacles and ventilation on each car. The same figure applies to nonmetallic wireways. 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. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. NEC Article 620 Part V, Traveling Cables, is driven by two major issues. Mike Holt. The conductors must be in their original sheaths or grouped together and taped or corded. 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. Each fused switch or circuit breaker in the panelboard is used as an elevator disconnect. 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. I've never run into this before. +1-251-479-4514 | [emailprotected], Trkiye Office For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. The electrical system designer calculates the maximum available fault current at the elevator controller. The conduit alone can't act as the grounding means. For instance, one method to reduce the available fault current is to add an isolation transformer ahead of the elevator controller. Something went wrong. The code is not concerned with the efficiency or sophistication of equipment that it covers, except insofar as safety (in terms of human injury and property damage) is concerned. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Based on the analysis, the arc-flash boundaries at the elevator/escalator controllers ranged from 3-16 in. Many NEC articles address voltage limitations, and Article 620 is no exception. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. Shi Liguang, Yao Lianghong, Luo Zhiqun and Wan Jianru, Constructional Stretch and Hoist-Rope Tension . As recommended in NFPA 70E, the National Elevator Industry, Inc. (NEII) commissioned an arc-flash hazard analysis (in compliance with IEEE Standard 1584-2002 for procedures for calculating the incident energy of the arc flash) by an independent consultant to determine at what level an arc-flash hazard exists to employees who work on energized elevator equipment. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. For some manufacturers, such as Eaton, testing has been completed to determine the selective coordination ability of current-limiting BussmannTM series fuses with upstream Eaton circuit breakers. Your IP: They are to be located so as to be protected from physical damage, are to be of a flame-retardant type, and must be part of listed equipment, a driving machine or a driving-machine brake. Working spaces for electrical equipment that may have to be examined, adjusted, serviced or maintained is required in all occupancies in an earlier NEC section, 110.26(A). In order to aid enforcement, the panel additionally required marking the available fault current at the elevator controller. One. It states an elevator is permitted to be run by an emergency or standby power system. Required lighting shall not be connected to the load side of a ground-fault circuit interrupter. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. Described below are several work practices that may be used to reduce arc-flash hazards when working on energized equipment: 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. 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. 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. 6 feet, and shall meet the requirements of NEC 70 620.21(A)(1)(d). This website is using a security service to protect itself from online attacks. 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. For platform lifts and stairway chairlifts, the duty is intermittent. This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. In all cases, the working space must permit at least a 90 opening of equipment doors or hinged panels. You need at least one 120VAC GFCI-protected receptacle at each location. 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. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) 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? . As mentioned, traditional installations of a traction or hydraulic elevator include a separate machine room. In hoistways not longer than 6 ft., these additional wiring methods are permitted: A sump or oil-recovery pump located in the pit is permitted to be cord connected. 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. 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. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. From the website: Mohawk Lifts offers car lifts and auto lifts for purchase, including 2 post lifts, 4 post lifts, storage lifts, heavy duty mobile column lifts, parallelogram lifts, and other specialty items.

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