NEC 620.62 requires the elevator disconnecting means (fused switch or circuit breaker) to selectively coordinate with all supply-side overcurrent devices. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. 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. Lights and convenience outlets in elevator pits shall be installed to comply with the requirements of CCR, Title 24, Part 3, Article 620. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. Get more of Elevator World. 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. NEC has a further note that the term wheelchair lift has been changed to platform lift.. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. 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. 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. Society of Mechanical Engineers. Dont troubleshoot unless you can keep your shoe/boot soles dry. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. Part of the reason that elevator usage is extraordinarily safe is that construction and maintenance are regulated by the wonderfully robust ASME A17.1 2007/CSA B44-07 Safety Code for Elevators and Escalators, which contains overall construction and maintenance requirements everything from seismic mandates to machine-room lighting. The various items to consider and check when designing for elevator installations have many potential pitfalls. U.S. Latham, NY Shopping Miscellaneous Retail Stores, NEC Wheelchair lifts EazyLift Elevators, . from the exposed components, and the incident energy calculated at 18 in. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. You are seeing this message for one of three reasons: You have reached your limit of free content. NEC Article 620 Part VI, Disconnecting Means and Control, is rather exacting. 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. Similar provisions are attached to elevator-car heating and air-conditioning disconnecting means, and to other utilization equipment. ), advise the building owner to correct the condition. You are seeing this message for one of three reasons: You have reached your limit of free content. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. One. 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. It is further stressed that no provision is to be made to open or close the disconnecting means from any other part of the premises. 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 As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. The usual scenario for electrical injury is shock when electrical current passes through the human body. 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. 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. 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. 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. Performance & security by Cloudflare. PK ! Hoistway pit lighting and receptacles 5. Many new buildings are incorporating an elevator design that does not include an equipment room (sometimes called machine room-less elevators). This will normally require you to vent the room with a fire/smoke damper and include smoke detector signals in the control logic. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. 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. Freight Elevator Door Control: An Opportunity for Wireless Technology. 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 feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. Hint: Duct Tape to the Rescue, NEC: Air Conditioning and Refrigerating Equipment Part 5. This room is to be secured against unauthorized access (kept locked). 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. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. (e) Pit Maintenance. Good documentation is of key importance to recalling what decisions were made and why. ), 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. 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. 974 0 obj <>/Filter/FlateDecode/ID[<64E135C225F1064D91BC8119D14516A9>]/Index[953 36]/Info 952 0 R/Length 105/Prev 204101/Root 954 0 R/Size 989/Type/XRef/W[1 3 1]>>stream APPENDIX A 2.2. 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. 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. Requirements for commercial garages per the National Electrical Code. 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. 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. Many NEC articles address voltage limitations, and Article 620 is no exception. Traveling cables are to be approved for hazardous locations and must comply with the appropriate sections for each hazardous-location class that covers use of flexible cords. See Section 3 of the. So, we see that for elevator work, greater fill is allowed. 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. Fluid pressure in the cylinder raises and lowers the elevator cab. 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 locking capability is important so during maintenance, the equipment will not be inadvertently energized. Something went wrong. 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. 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. 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. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 2.2.6.1 This switch shall be so located as to be acces-sible from the pit access door. The architect has a choice of either traction or hydraulic elevators. The light switch in the pit must be mounted 42 in. 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. 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. +90 (216) 348 4876, India Office 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. 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. If the equipment must remain energized to perform work, effective insulation and safe electrical working practices should be observed. 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. Sumps and sump pumps in pits, where provided, shall be covered. If this is not done and the available fault current exceeds the elevator controller SCCR, other solutions to reduce fault current must be reviewed or equipment changes and field evaluations may be needed. %%EOF 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. Additional requirements concern escape routes. (All intentionally grounded elements must be held at equal potential.) 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. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. Corporate Office He also required GFCI protection for the hard-wired sump pump that did not require it. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. (ASME has a separate document, A18.1-2008 Safety Standard for Platform Lifts and Stairway Lifts). 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. CLAIMED . For platform lifts and stairway chairlifts, the duty is intermittent. 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. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). 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. 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. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). The 12 definitions provided in NEC 2011, Section 620.2 are the place to start for guidance in this area, and the sections that follow lay out implementation guidelines that are very relevant in todays environment. All Rights Reserved | Contact Us | Privacy Policy. 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. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. . The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. You are a subscriber that needs to Sign In. The same figure applies to nonmetallic wireways. All Rights Reserved | Contact Us | Privacy Policy.
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