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. 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. The floor specified as the designated landing, which must be approved by the Fire Marshal, is usually the floor on grade level so passengers can quickly exit to the outside. David Herres Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. or larger is permitted to be installed in lengths in excess of 6 ft. Where motor-generators, machine motors or pumping-unit motors and valves are located adjacent to or underneath control equipment and provided with extra-length terminal leads not exceeding 6 ft. in length, such leads are permitted to be extended to connect directly to controller terminal studs without regard to carrying-capacity requirements. NEMA 4 : All electrical equipment, located less than 1225 mm (48 in.) We generally think of the 19th century as the great age of building codes. See Section 3 of the. When you consider that an elevator is an enclosed room with one or more doors that people voluntarily enter so they may travel hundreds of feet up or down, several observations are in order. A single dedicated receptacle supplying a permanently installed sump pump does not have to be a GFCI type. 988 0 obj <>stream 3016. Pits for Elevators. - California Department of Industrial Relations Where voltages exceed 600, a sign reading DANGER HIGH VOLTAGE is required. Traction elevators are typically faster and more energy efficient than hydraulic elevators, and are often used for high-rise buildings. But the lights don't have to be in the pit itself. As an installer and an inspector, one common issue I've seeen is incompatible connections associated with raceways connections and fittings. For elevators with battery lowering systems, an additional contact must be supplied and wired to disable the battery lowering system when the elevator disconnect is manually operated for maintenance. (f) Illumination of Pits. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. C.1.4 ELEVATOR PIT REQUIREMENTS 1. It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Performance & security by Cloudflare. GFCIs in Elevator Pits, Receptacles and More Any other utilization equipment associated with the elevator NEC 70620.85 Smoke detectors to recall elevators on Phase I recall are required to be located on each landing, If it kills the son of the owner, the son of that builder shall be put to death.. Fuses: Verify that the correct size, type and capacity are installed. Have wiring identified for use in wet locations in accordance with the requirements in NFPA 70. 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. Hard-service cords and junior hard-service cords are permitted as flexible connections between the fixed wiring on the car and devices on the car doors or gates. Years may lapse between the design and installation stages of a project. 953 0 obj <> endobj He is saying that each pit requires a separate circuit, in other words "dedicated". It states an elevator is permitted to be run by an emergency or standby power system. : inspecting; troubleshooting; observing; etc.) Both electric and nonelectric elevators are to comply with Article 250, the code article that covers grounding and bonding in general. You can email the site owner to let them know you were blocked. Adhering to the requirements will ensure a hazard-free electrical installation. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. +90 (216) 348 4876, India Office 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. Here, the National Electrical Safety Code has jurisdiction. Eazylift Albany LLC, 836 Troy Schenectady Rd, Latham, NY, Elevators 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. These must also be insulated for the maximum voltage applied to any conductor within the cable or raceway system. 3. 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. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. (A) Separate Branch Circuit. z!0: - [Content_Types].xml ( n0EUb*>-RxV=QUAl"93dFk%Y?l}MGDV Since 1953, Elevator World, Inc. has been the premier publisher for the global vertical transportation industry. %%EOF 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. Car air-conditioning and heating units 3. Something went wrong. It is worth noting that these NEC terms, used throughout Article 620, have been chosen to correlate with A17.1-2007 usage. This is typically accomplished via a shunt trip device. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. 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. So, we see that for elevator work, greater fill is allowed. 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. of the sprinkler heads. The surest means of avoiding an arc-flash hazard is to lockout and tagout the electrical service to a controller. PK ! Traditionally, the electrical system design engineer has given little attention to the elevator controller. Provide continuous, non -slip, horizontal rungs every 12" for the full height of the pit ladder. You are a subscriber that needs to Sign In. 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. 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 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. Also located in this room might be, but not limited to: exhaust fan, cooling unit (depending on local requirements and/or requirements set forth by the individual elevator supplier), lighting, voice and/or data drop serving the elevator cab emergency phone, elevator controller primary fused disconnect, elevator feeder shunt-trip circuit (i.e., shunt-trip circuit breaker), elevator cab lighting fused switch, and convenience receptacle(s). 6 Stop Switch in Pits There shall be installed in the pit of each elevator an ASME A17.1 CODE enclosed stop switch or switches meeting the requirements The following material is reprinted with permission from the American of 2.26.2.7 and 2.2.6.1 through 2.2.6.3. 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. endstream endobj 954 0 obj <. (Hard-service and junior hard-service are trade names that apply to over 30 types of flexible cord, all beginning with the letter S. They have varying properties, such as oil resistance, and various material compositions for insulation, such as a thermoplastic elastomer. Marking the available short-circuit (fault) current on the controller by the equipment installer. PDF Elevator Safety Program - Technical Clarification As stated in Section 7 of the Elevator Industry Field Employees Safety Handbook: Unless it is not feasible, (i.e. These are: remote machine room and control room (for elevator and dumbwaiter), and remote machinery space and control space (for elevator and dumbwaiter). or larger, not over 6 ft. in length. NEC Article 0: Elevator art by David Herres Continued. Because they need to move and flex, traveling cables are not required to be in a raceway. 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. f?3-]T2j),l0/%b . 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. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. By subscribing, you agree to our User Agreement and Privacy Policy & Cookie Statement. Section 620.62, Selective Coordination, is central to multi-elevator installations and must be closely observed. Additional branch circuits are to supply other utilization equipment not covered above. An exception provides that liquid-tight flexible metal conduit or liquid-tight flexible nonmetallic conduit 3/8 in. It begins by considering metal and nonmetallic wireways. We have circuited the receptacles and lights in the pits to the same circuit. 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. The party responsible for procuring the elevator control panel must state the minimum acceptable SCCR or the maximum available fault current where the controller will be installed. Pit light with guard (ten foot candles min. Nevertheless, the primary NEC focus is on elevators, and the intention is to mitigate the hazards associated with the use of electricity. Article 620s Definitions section includes two terms that describe spaces not attached to the outside of a hoistway. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. In these installations, it is best to design the elevator controller so the elevator controller SCCR is adequate for the available fault current. 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. For circuit breakers, time-current curves must be consulted as well as the circuit breaker manufacturers selective coordination tables. Dont troubleshoot unless you can keep your shoe/boot soles dry. PDF C.1 General Requirements for All Elevator Installations The usual scenario for electrical injury is shock when electrical current passes through the human body. The code exempts some fairly broad areas where compliance is not expected. The light switch for the equipment room must be adjacent to the entrance door on the latch side. They must be in enclosures with doors or removable panels that can be locked in the closed position. 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. Modern electronic elevator controls can be sensitive to temperature shifts. One. You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit. 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.
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