Dont troubleshoot unless you can keep your shoe/boot soles dry. NEC Guidelines on Commercial Garages | EC&M For this reason, the NEC provides for adequate working space around electrical equipment that may need to be serviced. Get more of Elevator World. The lighting switch shall be located so as to be readily accessible from the pit access door. 2.2.2.6 . It employs specialists in Mobile, Alabama, and has technical and news correspondents around the world. Another important electrical system design consideration for supplying power to multiple elevators is NEC 620.62. The locking capability is important so during maintenance, the equipment will not be inadvertently energized. 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. 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. 3016. Pits for Elevators. - California Department of Industrial Relations The light switch for the equipment room must be adjacent to the entrance door on the latch side. You must locate this key switch at the main lobby or at the building fire command center. Pits shall be maintained in a clean and dry condition. PDF Elevator Safety Program - Technical Clarification 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.. If it kills the son of the owner, the son of that builder shall be put to death.. 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)]. Through numerous editions, the NEC has, to a great extent, mitigated the hazards accompanying widespread use of electricity, particularly with respect to elevator technology. 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. ranged from 0.06 cal/cm2 to 0.95 cal/cm2, which indicates that the arc-flash hazard to employees is primarily to the hands and arms. The cord is to be a hard-usage, oil-resistant type not over 6 ft. in length. 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. Mobile, AL 36606 USA This may be countered by providing good machine-room ventilation. The disconnecting means is to be in the machine room or similar location, with provision for being locked in the open position. It is further specified the machine-room lighting switch be located at the point of entry. The electrical conductors and equipment for non-mine elevators that extend below grade are under NEC jurisdiction. For current-limiting fuses, the information to achieve selective coordination has been available for many years in fuse amp ratio tabular form. Metallic articles: Remove metallic articles such as watches, chains, bracelets, earrings, belt buckles and keychains before troubleshooting. It does specify wiring methods allowed, though, in 620. The panel further clarified that the marked SCCR value must be adequate for the available fault current to ensure a safe installation. Receptacle for pumps located in the pit shall be a single non-GFCI and shall be located 6 inches above the lowest landing. 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. We have circuited the receptacles and lights in the pits to the same circuit. 354 Morgan Ave. There are options available to achieve this depending upon the customers needs. 23.254.250.15 This website is using a security service to protect itself from online attacks. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. NEC has a further note that the term wheelchair lift has been changed to platform lift.. Hazards created by water, snow or condensation in the work area can cause slips, falls and accidental contact. 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. This may include wiring for signals, communication with the car, lighting, heating, air-conditioning and ventilation of the car or hoistway for fire-detecting systems and pit sump pumps. 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. GFCIs in elevator pits During an inspection of the elevators in a commercial building, the state inspector failed us for using a GFCI-type circuit breaker to protect a receptacle in the elevator pit. It is worth mentioning that when 600 V is talked about as a limit in the NEC, it is generally meant that the familiar 600-V nominal-voltage system is considered to lie within the permitted zone, making it a common usage. A few years later, in 1880, Werner von Siemens built the first electric elevator, setting the stage for a new industry that would change the world by making the practical use of tall buildings possible. To avoid this situation, designers can specify elevator controls with a safety feature commonly called a rescuvator. PK ! This is typically accomplished via a shunt trip device. The Code provides guidance through regulations to establish requirements. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Feeders may be installed within the hoistway where the elevator has a driving-machine motor in the hoistway or on the car or counterweight. 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. ,l7CLHmcX9*F -{Q|^"XL`b1y]$,y *R/2Rn{\xG L*vMP.uKW,)68]Y}+ FYS1B=Q0S>Hc Where the elevator shaft and/or equipment room has a sprinkler fire suppression system installed, the elevator Code requires main line power to the elevator be removed prior to the application of water. Traction elevators are typically installed in a bank of elevators where fused switches, or circuit breakers in a panelboard are located in the machine room serving the bank of elevators. ), advise the building owner to correct the condition. Doors must open in the direction of travel and be equipped with panic bars, pressure plates or other devices that are normally latched but open under simple pressure. Guidance in determining whether elevator pits meet the definition of N _rels/.rels ( j0@QN/c[ILj]aGzsFu]U ^[x 1xpf#I)Y*Di")c$qU~31jH[{=E~ The drain or sump pump discharge shall be into the sanitary or storm drainage system through an indirect waste connection. Accordingly, the supply wires are protected only for short circuit, and the overload protection is provided closer to the motor. Additional requirements concern escape routes. Though I understand how someone might argue two. First, the ATS signals the elevators that it's about to switch over to emergency power preferably 30 sec or more prior to switching, which allows the elevator controller to bring each elevator cab to the nearest landing and stop, thus protecting the motors and electrical system. The next section, 620.36, concerns different systems in one raceway or traveling cable. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. These are part of Article 725, Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. NFPA 72 requires the control circuit between the Fire Alarm System and the shunt trip be monitored for integrity. Fuses: Verify that the correct size, type and capacity are installed. NEC 2011 also addresses branch circuits for machine room or control room/machinery space or control-space lighting and receptacles. 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. hbbd```b``+3dL `Y[gw9`RLJO*A$w$@L`F*{|0 P ASME A17.1, Section 2.2.5, National Electrical Code, Rule 620-85 4. Car air-conditioning and heating units 3. Adhering to the requirements will ensure a hazard-free electrical installation. Be sure to provide a horn/strobe alarm in large equipment rooms because they can be noisy, isolated places. Personal protective equipment (PPE): Use appropriate PPE to protect body parts within the range of 3-16 in. 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. CLAIMED . The disconnecting means is also to be a listed device. My reasoning comes from 620.24 (A) and (C). 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. (B) Lighting Switch. Sign up for our free e-newsletter. 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. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. 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..