z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV Even though Edison grasped the basic ideas of fusing and overcurrent protection, many hazards remained. Get more of Elevator World. Elevator PITS | Mike Holt's Forum 1. 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. While machine room-less designs have been commercially available for many years, their use may still be unknown to some AHJs. Cables used in Class 2 power-limited circuits are permitted between risers and signal equipment and operating devices, provided they are supported and protected from physical damage and are of the jacketed and flame-retardant type. 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. 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. GFI Receptacles: GFI receptacles shall be required in all elevator machine rooms, machinery spaces and elevator pit areas. 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. Installing electrical equipment where its SCCR is less than the available short-circuit current creates serious safety hazards. The vast majority of equipment serving the elevator is located within this room (i.e., elevator controller). Apr 24, 2013. correct me if I'm wrong, but I believe it's damp. The feeder OCPD needs to remain closed so the remaining elevators have power and continue to function. The article stands apart from the rest of the code in the sense it exempts these categories of circuits from the general requirements for wiring in most occupancies, found in Chapter 3. 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. As such, elevator controller manufacturers should make the effort to rethink their designs to avoid costly system design changes. 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. If the smoke detector at the designated landing goes into alarm, the elevator will stop at a predetermined alternate floor, which is usually the floor above the designated floor. Thus, the need for door interlock functionality is recognized. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. 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) It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. If we fast forward more than 36 centuries, we see some important new developments in elevator technology. Get directions, reviews and information for Eazylift Albany LLC in Latham, NY. 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. We have circuited the receptacles and lights in the pits to the same circuit. Motor feeder short circuit and ground-fault protection must be as required in Article 430, Part V for all motors. This clear working space must be 30 in. 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. 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. 2m9 `K]f*F gaR 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. 953 0 obj <> endobj Here again, the lighting is not to be connected to a GFCI, whereas such protection is required for the receptacle(s). Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. Corporate Office All rights reserved. ), 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. When the elevator car is at the top landing, it is the length of cable as measured from the point of suspension on the car to the bottom of the loop. NEC Article 0: Elevator art by David Herres Continued. 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. You are seeing this message for one of three reasons: You have reached your limit of free content. The disconnecting means must disconnect the elevator from the emergency, standby and normal power systems. 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. 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. Though I understand how someone might argue two. The conduit alone can't act as the grounding means. For instance, a typical elevator controller may traditionally have SCCR ratings from 5 to 10 kA. 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. Later in the 19th century, Thomas Edison and his associates built an electrical distribution system in Lower Manhattan. Hydraulic reservoir characteristic of a hydraulic-piston-operated elevator. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. 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. APPENDIX A 2.2. The traveling cable, of necessity, is exempted. Indeed, most elevator accidents involve maintenance workers, yet even theirs is not an excessively dangerous profession. Section 725.45 concerns the location of overcurrent devices and provides for feeder and branch-circuit taps, transformer primary side overcurrent device location and overcurrent device location at the input side of electronic power sources. Traction elevators raise and lower the elevator cab with cables, a pulley system, and counter weights powered by a motor at the main drive wheel. The code exempts some fairly broad areas where compliance is not expected. Other requirements: Spa's and Hot Tubs 1996 NEC 15-20 Amp 120 volt Receptacle Requirements for Dwelling units: All outdoor The light switch in the pit must be mounted 42 in. EazyLift Elevators, Stairlifts, Wheelchair Lifts & Ramps. For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. endstream endobj 954 0 obj <. Every building is different. This requirement applies to all controllers, disconnecting means and other electrical equipment that may need servicing, inspection or maintenance. We resume with a look at wiring methods, overcurrent protection, grounding and other NEC provisions as they relate to these installations. Additional branch circuits are to supply other utilization equipment not covered above. 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. +91 8025357028, 2022 Elevator World, LLC. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. 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. [emailprotected] These circuit breaker selective coordination tables can be used to identify the maximum fault current that a pair of circuit breakers can selectively coordinate. With these new NEC requirements, there is now the potential that an elevator controller SCCR may be required thats higher than what elevator manufacturers have historically furnished. David Herres 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. 354 Morgan Ave. 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. It is important, where mandated, that there be no more than a single disconnecting means, so if emergency action is required, first responders will not be able to power down the equipment from one location. Auxilliary gutters are permitted in machine and control rooms between controllers, starters and similar apparatuses. 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. Thus, the traveling cable must be supported by a steel supporting member. You need to Subscribe to continuing reading. Modern electronic elevator controls can be sensitive to temperature shifts. It need not be exactly centered on the equipment, and working spaces of adjacent pieces of equipment may overlap. Utility-owned electrical structures not directly concerned with electrical generation, transmission and distribution are NEC regulated. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. Such cable groups are to be supported at intervals not over 3 ft. and located so as to be protected from physical damage. 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. ^W i word/document.xml=nr]6Id=,_$j9-"Y.iGU\h_}. wide or the width of the equipment, whichever is greater. 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. Part II of Article 620 concerns conductors used in elevator work, and several important requirements are covered. 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. 2.2.2.6 . The various items to consider and check when designing for elevator installations have many potential pitfalls. Motor controllers are permitted outside the spaces specified above. Click to reveal
Did Hannah And Ken Date After Survivor,
Controlled Drugs Accountable Officer For Barts Health Nhs Trust,
Jennifer Steinbrenner Age,
Why Don't Oreos Get Soggy In Milk Anymore,
Mapo Tofu Good Pizza Great Pizza,
Articles N