It is also essential that machine-room lighting be totally reliable and separate from the machinery supply to facilitate troubleshooting in the event of elevator problems. PK ! Car air-conditioning and heating units 3. If the disconnecting means is an integral part of the motor controller, it is to be operable without requiring opening of the enclosure. Flexible cords and cables, or conductors grouped together and taped or corded, are permitted to be installed without a raceway. 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)]. Finally, in 1897, the first National Electrical Code (NEC) appeared. He is saying that each pit requires a separate circuit, in other words "dedicated". Notwithstanding, if sprinklers are installed in hoistways, machine rooms or the like, the disconnecting means is permitted to automatically open the power supply to the affected elevator(s) prior to the application of water. A raceway that comes loose on the inside of a hoistway could catch on a moving car, causing immense damage and hazard to users. Overload protection for motors is to conform with Article 430, Part III, the general code area that covers motor and branch-circuit overload protection for all motors. Traveling cables are to be supported by one of these means: Looping the cables around supports for unsupported lengths less than 100 ft. 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. 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 Flexible metal, liquid-tight flexible metal or liquid-tight flexible nonmetallic conduit 3/8 in. The branch circuit is to be protected by an overcurrent device located in the machine room, control room/machinery space or control space. The basic requirement is for minimum clear distances of various depths for equipment operating at 600 V or less, nominal, depending upon voltage to ground and lateral distance to insulated or grounded surfaces or exposed live parts (not an issue in elevator machine rooms). 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. 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. Dont troubleshoot unless you can keep your shoe/boot soles dry. APPENDIX A 2.2. This equipment is restricted to that used in connection with the specific elevator, dumbwaiter, escalator, moving walk, platform lift or stairway chairlift. NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, (f) Illumination of Pits. Every building is different. 1. Firefighters can then use portable telephone handsets in combination with the jacks and cabling. above the seal plate, adjacent to the ladder. Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. Guarding: Where possible, install temporary guarding to protect from inadvertent contact. Flexible cords and cables (same conditions as within hoistways). A separate branch circuit shall supply the hoistway pit lighting and receptacle (s). Here, the National Electrical Safety Code has jurisdiction. DOCX 26 80 00 - Elevator Electrical Requirements - University of Illinois Hammurabi, sixth king of Babylon and creator of the Babylonian Empire, decreed: If a builder builds a house for someone and does not construct it properly, and the house which he built falls in and kills its owner, then that builder shall be put to death. PDF Electric Elevator Checklist Cover Page - Oregon No provision is to be made to automatically restore power. 3. 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. Special conditions: Troubleshooting in wet, hot or cold conditions calls for extra caution. Please check your entries and try again. NEC Article 620: Elevators, Part 2 - Elevator World, Inc. These may include: The author would like to recognize Jonathan Kennedy for his assistance in creating this article. PDF Compliance with the 2017 NEC for Elevator Controllers If you can illuminate the pit using lights that are "above the top of the pit" (whatever that . The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. -inch conduit is needed to the sump pump. Modern electronic elevator controls can be sensitive to temperature shifts. 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. 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) 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. The fire loading resulting from an accumulation of abandoned low-voltage cabling may be considerable, and has to be understood and dealt with. Overcurrent devices protecting these branch circuits are to be located in the machine room or similar location. Louisiana State Uniform Construction Code Council adopts the 2014 NEC, Basic three-phase power measurements explained, Safety After the Storm Operating Portable Generators. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. This website is using a security service to protect itself from online attacks. 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. +90 (216) 348 4876, India Office As we have seen, a limited number of these are approved for elevator locations car, hoistway, pit and machine room. 953 0 obj
<>
endobj
Many NEC articles address voltage limitations, and Article 620 is no exception. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. 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. 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. Electricity is often one of the initial services to fail during a storm. 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. 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. This is typically accomplished via a shunt trip device. Many of these are for portable lighting.). We have circuited the receptacles and lights in the pits to the same circuit. All Rights Reserved | Contact Us | Privacy Policy. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. These are covered for generic, non-elevator specific use in earlier articles, 376 and 378, in Chapter 3, Wiring Methods and Materials. Similarly, motor branch-circuit short circuit and ground-fault protection must be as required in Article 430, Part IV, for all motors. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. Within cars, these additional wiring methods are permitted: The following additional wiring methods are permitted on the car assembly in lengths not exceeding 6 ft.: Within machine rooms, these additional wiring methods are permitted: The following wiring methods are permitted on the counterweight assembly in lengths not to exceed 6 ft.: Having looked at NEC 2011 mandates for elevator and related equipment installations, we will cover wiring methods, overcurrent protection, grounding and other related NEC provisions in part two of this series , running in the April 2012 issue of ELEVATOR WORLD. 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. +;-mka|7! 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. 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. 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 has a further note that the term wheelchair lift has been changed to platform lift.. hb``` ea``j~p2nfH
'xXg00,/(_ Iq8PDdg-~ s$!XI;Fn0vu
`h`R 1y
0B.":9.@, e`xI;=7O3fvbb8:SC;%O*20] The usual scenario for electrical injury is shock when electrical current passes through the human body. In such cases, it's economically justifiable to specify a traction type elevator. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. 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. 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. The fan should be on a dedicated circuit. Where the elevator shaft and/or equipment room has a sprinkler fire suppression system installed, the elevator Code requires main line power to the elevator be removed prior to the application of water. 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. 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. or larger, not over 6 ft. in length. 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. or larger, not exceeding 6 ft. in length, are permitted between control panels and machine motors, machine brakes, motor-generator sets, disconnecting means and pumping motors and valves. Requirements in Article 620 modify the articles in Chapter 3. Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. 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. Always verify all conditions and requirements with the state and the AHJ where the installation is taking place. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. 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. %%EOF
A single means for disconnecting all ungrounded main power-supply conductors is required and must be designed so no pole can be operated independently. However, this can vary depending on building conditions and exterior grade. Get more of Elevator World. GET YOUR CEUS TODAY, 1998-2021. Any other utilization equipment associated with the elevator 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. 2. Selective coordination is defined by the NEC as: Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents.. 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. You are seeing this message for one of three reasons: You have reached your limit of free content. 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. 23.254.250.15 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. endstream
endobj
954 0 obj
<. The same figure applies to nonmetallic wireways. Performance & security by Cloudflare. They must be in enclosures with doors or removable panels that can be locked in the closed position. 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. Notice the definition mentions the full range of operating times. The branch circuit supplying these units is to be similarly dedicated, with the associated overcurrent device located in the machine room or similar location. 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. The idea is quite simple. 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. Selective coordination is also required for multiple elevators per NEC 620.62. [emailprotected] In addition, requirements for selective coordination and shunt tripping should be complied with as needed for the installation. This may be countered by providing good machine-room ventilation. 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. The two primary hazards are fire and electric shock or arc flash, although there are others. 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. 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. The code notes that elevator rails or other hoistway equipment are not to be used as the grounding conductor for lightning-protection systems. Mike Holt. The Code provides guidance through regulations to establish requirements. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. Your IP: , !! Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. You need at least one 120VAC GFCI-protected receptacle at each location. A second door is required if the equipment is rated over 1200 amps and over 6 ft. wide. Elisha Otis safety elevator, introduced in 1853, prevented the fall of the car if the cable broke. Elevator travel is far safer than an automobile trip, and the chance of experiencing disaster is on the order of being struck by lightning in ones own backyard. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. 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. Metal grating shall be installed over the hole that sits flush with the pit floor. In driving through commercialized suburban areas, you frequently see paralleled conductors for large retail grocers (where there is a heavy refrigeration load). 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. They are to be part of listed equipment, a driving machine or a driving-machine brake. So, we see that for elevator work, greater fill is allowed. David Herres The disconnecting means is to be located adjacent to or an integral part of the motor controller. Sumps and sump pumps in pits, where provided, shall be covered. Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. 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.