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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. ), 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. 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. A further requirement concerns elevator-car air-conditioning and heating. 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. 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. Many NEC articles address voltage limitations, and Article 620 is no exception. 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 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)]. 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. 953 0 obj <> endobj These conductors may be covered with suitable shielding for telephone, audio, video or higher-frequency communications circuits. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. IAEI News Magazine. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. The sum of the cross-sectional area of the individual conductors in raceways is not to exceed 40% of the interior cross-sectional area of the raceway, except as permitted for wireways. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. 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. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. You are seeing this message for one of three reasons: You have reached your limit of free content. You need at least one 120VAC GFCI-protected receptacle at each 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. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. 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. 4.0 (2 Reviews) (2) CLAIMED . The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. 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. And so the needs can be very different. A section on branch circuits for car lighting, receptacles, ventilation, heating and air-conditioning contains a number of important provisions. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. The disconnecting means is also to be a listed device. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. First, the traveling cable must be composed of very fine-stranded conductors so it can flex with a minimum of internal stresses, ensuring long service life and reliability. [emailprotected] The two primary hazards are fire and electric shock or arc flash, although there are others. But the lights don't have to be in the pit itself. Motor controllers are permitted outside the spaces specified above. +90 (216) 348 4876, India Office This clear working space must be 30 in. Home Articles Elevator World April 2012 Issue NEC Article 620: Elevators, Part I. The light switch shall be located so to be accessible from pit access door. Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. 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. My reasoning comes from 620.24 (A) and (C). The sump pump/drain shall have the capacity to remove a minimum of 11.4 m. 3 /h (3,000 gal/h) per elevator. But, building codes had been in existence for many centuries. A separate 120VAC, 15A circuit is required for cab lighting and accessories, and it must have its own local disconnect and OCPD in the equipment room as well. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. The thinking behind this requirement is that the injured worker could have severe hand burns and be unable to operate a conventional doorknob. 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. (e) Pit Maintenance. Here, the National Electrical Safety Code has jurisdiction. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. Building codes were deemed necessary to protect the public against shoddy builders and outmoded construction techniques. Moreover, because motors have a higher starting current than other loads, the overcurrent protection protocol is unique to them and somewhat counterintuitive. 1. 836 Troy Schenectady Road ; Latham, NY 12110 . Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. Selective coordination is also required for multiple elevators per NEC 620.62. High-rise buildings pose additional concerns. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. Flexible cords and cables part of listed equipment operating at 30 V (42 VDC) or less, similarly supported and protected, jacketed and flame retardant, are permitted. One. Fuses: Verify that the correct size, type and capacity are installed. 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. This website is using a security service to protect itself from online attacks. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. 1993 NEC 15-20 Amp 120 volt Receptacle Requirements: Wet bar sinks, all bathrooms, roof tops, elevator machines rooms, elevator car tops, elevator pits. 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. Such vehicles include, but are not . 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. A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. 3. Get more of Elevator World. The next section, 620.36, concerns different systems in one raceway or traveling cable. You are a subscriber that needs to Sign In. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. 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. If it kills the son of the owner, the son of that builder shall be put to death.. The action you just performed triggered the security solution. 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. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. 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. If the building has emergency power available, use it to supply the cab lights. 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. 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. Performance & security by Cloudflare. 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. Section 620.85, GFCI Protection for Personnel, provides that 125-V, single-phase, 15- and 20-amp receptacles installed in pits, hoistways, machinery spaces, machine rooms, escalators and moving walks, and on elevator car tops are to be GFCIs. As always, the best advice in all instancesdo your homework, communicate often, and document decisions made. Please check your entries and try again. above the seal plate, adjacent to the ladder. 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. You can email the site owner to let them know you were blocked. With heavy use on a hot day, the oil can overheat, causing elevator shutdown. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. PK ! However, space is frequently limited within the shaft and as such many ancillary components (shunt trip circuit breakers, fused disconnects) may need to be located outside of the elevator shaft. 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. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. In this case, it may be best if the elevator controller manufacturer does not include the elevator disconnecting means (often offered as a circuit breaker) but instead have the installer provide a separate fused disconnect to comply with NEC 620.51(A) and also achieve a high SCCR for the elevator controller when fuses are provided as specified by the elevator controller and marked on the elevator controller nameplate. To achieve flexibility and endurance, traveling cable is more finely stranded and, where possible, separated into discrete conductors. You are a subscriber that needs to Sign In. 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. 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. 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 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. The two documents are in harmony and should be used in conjunction. 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) 2.2.2.6 . 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. +90 (216) 348 4876, India Office Even non-composite fiber-optic cable, which does not carry electrical energy, is subject to the code. Elevators with driving machines located on the car or counterweight, or in the hoistway are permitted outside the specified spaces. The code exempts some fairly broad areas where compliance is not expected. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. 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. 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. We have circuited the receptacles and lights in the pits to the same circuit. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. NEC Article 0: Elevator art by David Herres Continued. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. If power is not being supplied to the elevator controller (e.g., open mainline fuses, etc. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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. . The electrical energy does not traverse the human body, but proximity to the explosion means severe injury is possible from the intense heat and concussive shockwave. 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. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. . +91 8025357028, 2022 Elevator World, LLC. This is because the material may contribute fuel to a fire that has originated elsewhere. 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. 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. 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. 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). Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). 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). 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. This is especially true in an elevator shaft where measures have to be taken to ensure that a hazardous situation is not created. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. 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. The lighting is not to be connected to a GFCI, because the elevator car is not a place that should experience nuisance tripping. Dont troubleshoot unless you can keep your shoe/boot soles dry. Three wiring categories within hoistways are allowed in addition, each with exceptions. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. 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. Because they need to move and flex, traveling cables are not required to be in a raceway. In fact, an entire elevator system for a project is most often designed and specified by the architect who has little understanding of the electrical distribution system. 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. Additional requirements concern escape routes. Sign up for our free e-newsletter. or larger, not over 6 ft. in length. In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. 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. The electrical system designer calculates the maximum available fault current at the elevator controller. 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. Any other utilization equipment associated with the elevator 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. (B) Lighting Switch. The fan should be on a dedicated circuit. 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 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. Marking the elevator controller short-circuit current rating (SCCR) by the elevator controller manufacturer. 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. This is typically accomplished via a shunt trip device. 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. NEC Article 620 contains numerous other disconnect provisions, which must be carefully scrutinized prior to design work so the installation is compliant. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. The fan should be on a dedicated circuit. Pits shall be maintained in a clean and dry condition. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. ), advise the building owner to correct the condition. 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. Every building is different. This device must be either a fused disconnect or a circuit breaker because ANSI/ASME A17.1 requires you to install an additional overcurrent protection device (OCPD) in the elevator equipment room. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. 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. 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. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. The light switch for the equipment room must be adjacent to the entrance door on the latch side. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. 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. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure.

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