These overcurrent devices may not be located where they will be exposed to physical damage or in the vicinity of easily ignitable material. As long as you can remove the trim and access the junction box it will be considered readily accessible! A wire, bus, screw, or similar suitable conductor is acceptable as a main bonding. Transformers having a secondary voltage not exceeding 1,000V, with primary overcurrent protection only, must have the primary overcurrent protective device sized per the percentages shown in Table 450.3(B) and the percentages mentioned in its applicable notes [Sec. Make a written request to the facility manager to affix a sign to the door, and hang another sign inside the room stating its not a storage area. ___ are permitted inside conduit bodies, if the manufacturer durably and legibly marked the cubic inch capacity on the conduit body. Broken fiberD. Start with "Branch Circuit," not with "Branch Circuit Overprotection Device.". Bonding Connected to establish electrical continuity and conductivity. Example: A service disconnecting means must be readily accessible or near the entry point of the service conductor. Service Lateral A. Branch Circuit General Purpose A general purpose branch circuit supplies two or more receptacles or outlets for lighting and appliances. A reduction in clearance to 914 mm (3.0 ft) is permitted where the voltage between conductors does not exceed 300 and the roof has a slope of 102 mm (4 in.) A fuse is an electrical gadget used to shield the circuit from overcurrent. The word luminaire refers to . "I have learned, in whatsoever STATE I am, therewi, http://www.usahardware.com/inet/shop/item/30550/icn/20-068163/bussman/bp_sru.htm. If I understand the situation correctly (no guarantee of that! Check The Knowledge False Not readily accessible means you dont have to worry about it at all or ever have to service it? 110.14(C)(1)(a)(3) and Table 310.16]. Receptacles installed on 15- and 20-ampere branch circuits shall be of the grounding type except as permitted for replacement receptacles in paragraph (b)(2)(iv) of this section. Service Drop A. Texas Electrical Code 2020 > 2 Wiring and Protection > 225 Outside Branch Circuits and Feeders . Power conductors below communication conductors -- 762 mm (30 in. A motor disconnecting means must be located in sight from the motor location as required by 430. If the system is a high-impedance grounded neutral system in which a grounding impedance, usually a resistor, limits the ground-fault current to a low value for 3-phase ac systems of 480 volts to 1000 volts provided all of the following conditions are met: Ground detectors are installed on the system; and. The noncurrent-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame. Example: Conductors connected to switches and receptacles are accessible by a removable plate or device. Stumped by the Code? three-wire, three-phaseD. 240.6(A)], the next higher rating is permitted [Sec. Overcurrent protection for transformers not over 1,000V. ." Grounding-type receptacles shall be installed only on circuits of the voltage class and current for which they are rated, except as provided in Table S-4 and Table S-5. Problems due to aging during operationC. Ready accessibility to wiring in luminaires is required in all cases required when a building is considered public c.not required dat required if there is a junction bexaby ANS: PTS: REF: Definitions A load having the maximum level of current sustained for three hours or more is referred to as a load. Branch Circuits A. 240.6(A)]. The neutral point is the common point on a Wye-connection in a polyphase system. main bonding jumper They cant be attached to any fire escape, downspout or plumbing equipment. Bonding Jumper (Main) An Equipment bonding jumper is the connection between two or more portions of the equipment grounding conductor. Service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of not less than 914 mm (3.0 ft) from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, and similar locations. 4. 22. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS. is permitted where the voltage between conductors does not exceed 300 if: The conductors do not pass above the roof overhang for a distance of more than 1.83 m (6.0 ft), 1.22 m (4.0 ft) horizontally, and. Nonconductive coatings on transformer enclosures must be removed to ensure electrical continuity, or the termination fittings must be designed to make such removal unnecessary [Sec. Above finished grade or sidewalks, or from any platform or projection from which they might be reached. Grounding triad Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. 450.3(B)]. Overcurrent devices do not have to be readily accessible if ____. 110.25 [Sec. The branch circuit wiring method shall include or provide an equipment grounding conductor to which the grounding contacts of the receptacle or cord connector shall be connected. Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and metal outlet or junction boxes that are part of the circuit for these appliances shall be grounded. - Maximum Cord- and Plug-Connected Load to Receptacle, Table S-5. Never set two transformers with their vents facing each other. equipment grounding terminal bus Exception: Overcurrent devices don not have to be readily accessible if located adjacent to the equipment where access is achieved by the use of portable means. A reduction in clearance above only the overhanging portion of the roof to not less than 457 mm (18 in.) Courtesy ofwww.MikeHolt.com. Fuses and circuit breakers shall be so located or shielded that employees will not be burned or otherwise injured by their operation. Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the connecting means is readily accessible the total of the conceitdees of wood local andards Located at the equipmenl where excess is achieved by the we of poetic ANS: PTS: REF: Definitions 3. There are a wide variety of supplementary fuses and fuse holders, which have small physical dimensions . The following requirements apply to temporary wiring installations that are used during construction-like activities, including certain maintenance, remodeling, or repair activities, involving buildings, structures or equipment. Dont install a transformer below a water heater that is on a mezzanine or similar elevation. 240.6(A) and Table 450.3(B) Note 1]. Patient equipment grounding point is used ,to the eliminate the electromagnetic, The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. A two-pole circuit breaker may not be used for protecting a 3-phase, corner-grounded delta circuit unless the circuit breaker is marked 1 -- 3 to indicate such suitability. All required tests shall be performed before first use; before equipment is returned to service following any repairs; before equipment is used after any incident which can be reasonably suspected to have caused damage (for example, when a cord set is run over); and at intervals not to exceed 3 months, except that cord sets and receptacles which are fixed and not exposed to damage shall be tested at intervals not exceeding 6 months; The employer shall not make available or permit the use by employees of any equipment which has not met the requirements of paragraph (b)(3)(ii)(C) of this section; and. Overcurrent devices shall be readily accessible to each employee or authorized building management personnel. Over areas, other than public streets, alleys, roads, and driveways, subject to truck traffic. The overcurrent devices shall be readily accessible to the tenants they serve -- at anytime the tenant will be able to access the OCD quickley, without hinderance of locked doors in which they do not have keys -- If the tenant can freely walk to the OCD for access then you are good -- I am also assuming the tenant has permanate provisions for cooking in their unit. Two exceptions to the make readily accessible rule are noted in Sec. Power quality problems can occur because of incorrectly grounding and bonding a transformer. (This category includes conditions covered under the 3.05-m (10.0-ft) category where the voltage exceeds 300 V.). Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____. I = VA (E 1.732) I = 45,000VA (480V 1.732) I = 54A. IMO, if you stick a fuse within a cord, and plug that cord into a receptacle outlet, you are outside the premises wiring system. (If these areas are accessible to other than pedestrian traffic, then one of the other conditions applies.). Accessible (Equipment) Accessible equipment is equipment not guarded by locked doors, elevators, or other. Notice the language is accessible to qualified personnel. This in no way inhibits making transformers inaccessible to unqualified personnel. In most cases, access can be gained through the use of a ladder or scaffolding ect. Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a(n) ____ over an inner flexible metal core. Install the service disconnecting means at a readily accessible location. LOCATED ADJACENT TO THE EQUIPMENT WHERE ACCESS IS ACHIEVED BY THE USE OF PORTABLE MEANS, C.THE TOTAL LOAD OF THE ADJACENT CIRCUIT DOES NOT EXCEED LOCAL STANDARDS, D.THE DISCONNECTING MEANS IS READILY ACCESSIBLE. The record shall be made available on the jobsite for inspection by the Assistant Secretary and any affected employee. 15A for 14 AWG copper, 20A for 12 AWG copper, and 30A for 10 AWG copper. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. If fuses are used for overcurrent protection, a fuse shall be connected in series with each ungrounded conductor; Each protective device shall be capable of detecting and interrupting all values of current that can occur at its location in excess of its trip setting or melting point; The operating time of the protective device, the available short-circuit current, and the conductor used shall be coordinated to prevent damaging or dangerous temperatures in conductors or conductor insulation under short-circuit conditions; and. These circuits exclude the connection of luminaires (lights) unless they are part of the appliance being connected. Ground detectors are installed on the control system; If the system is an isolated power system that supplies circuits in health care facilities; or. (A) Accessibility. Branch Circuit Appliance An appliance branch circuit supplies energy to one or more outlets for the purpose of connecting appliances. NEC 2008 article 100 definitions. B. Cord connections. A: The correct option along with the explanation is provided in the following section. It comprises a, A: ANSWER (1) An AFCI is basically like a GFCI but it will protect the entire circuit from the breaker and back. continuous . LOCATED WITHIN A GROUNDED JUNCTION BOX B. 3. Overcurrent Protection Device Overcurrent Protection (Breaker) A branch-circuit overcurrent protection is a device capable of protecting feeders, branch circuits, service equipment between its rated current and its interrupting rating. The biggest hang up we had was the use of the word "obstacle." Overcurrent devices do not have to be readily accessible if located within anded jacobs k. the connecting means is readily accessible the total of the conceitdees of wood local andards Located at the equipmenl where excess is achieved by the we of poetic ANS: PTS: REF: Definitions 3. Installing a main bonding jumperB. A separately derived system is a premises wiring system whose power is derived from a source of electric energy or equipment other than a service. You will have to check the listing of the fuse and fuse holder. Additionally, pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level need not be grounded. Over commercial areas subject to pedestrian traffic or to vehicular traffic other than truck traffic. Listed equipment protected by a system of double insulation, or its equivalent, and distinctively marked as such. This can be outside the structure. Always install transformers per the manufacturers instructions and ensure transformer ventilating openings are not blocked by walls or other obstructions [Sec. Notice the bonding jumper must be made of copper or other corrosion-resistant material. Except for motor running overload protection, overcurrent devices may not interrupt the continuity of the grounded conductor unless all conductors of the circuit are opened simultaneously. Over residential property and driveways. The grounded circuit (system) conductor is generally not permitted to be used to ground, A: Amotorcontrollerisadeviceorcombinationofdevices,thatcancontrolhowanelectricmotor, A: According to question we have to discuss about A service disconnection means must be installed, A: two types of signaling mode with a neat diagram, A: With industry input, the TIA/EIA cable standards have been developed by the Telecommunications, A: According to article 702 - Optional Standby System Step back from the transformer installation task itself, and look at the context that is, see the forest and not just the tree you are working on. Enclosures are guarded against employee contact. You are right, and the other guy is wrong. The secondary conductor ampacity is not less than 1 10 of the rating of the overcurrent device protecting the primary of the transformer multiplied by the turns ratio. Overcurrent devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than 2.0 m (6 ft 7 in.) This Note does not require the next size up protection; it permits the next size up. Not be located where they will be in the . ampacity = Electrical metallic tubing must not be ____. B. as is. n the Duplicate Busbar System, continuity of service is possible even if the Main, A: All the exposed noncurrent carrying metal parts of an information technology system shall be bonded, A: Correct option is B that is ELECTRIC GROUND CONDUCTORS must be capable of withstanding the higher, A: Jumpers allow the computer to shut down the electrical circuit, allowing electricity to flow to, A: Question. Verified Answer for the question: [Solved] Overcurrent devices do not have to be readily accessible if ____. 450.9 provides ventilation requirements, and Sec. A) located within a grounded junction box B) the disconnecting means is readily accessible C) the total load of the adjacent circuit does not exceed local standards D) located adjacent to the equipment where access is achieved by the use of portable means A circuit breaker with a straight voltage rating, such as 240 V or 480 V, may only be installed in a circuit in which the nominal voltage between any two conductors does not exceed the circuit breaker's voltage rating. Neutral Conductor or Point D. The neutral point is the midpoint on a single-phase portion of a 3 wire direct current system. Article 450 of the National Electrical Code (NEC) opens by saying, This article covers the installation of all transformers. Then it lists eight exceptions. Exposed noncurrent-carrying metal parts of portable and mobile equipment shall be connected by an equipment grounding conductor to the point at which the system neutral impedance is grounded. 18. Rigid metal conduit (RMC) is a raceway of ____. The long-time trip element setting of a breaker or the minimum trip setting of an electronically actuated fuse may not exceed six times the ampacity of the conductor. A grounded conductor is a system or circuit conductor that is intentionally grounded. Raceway containing branch circuit conductors in concrete, Conduit Body A conduit body is a separate portion of a conduit (tubing) system providing access to the interior of the system through a removable cover at a junction. Conduit (Junction) Box, Conduit Body B. FS, FD and larger boxes (cast or sheet metal) are not classified as conduit bodies. fire protection system.D. Festoon Lighting A. Festoon lighting is a string of outdoor lights suspended between two points. Occupational Safety & Health Administration. Verified questions. Noncurrent-carrying metal parts of fixed equipment, if required to be grounded by this subpart, shall be grounded by an equipment grounding conductor that is contained within the same raceway, cable, or cord, or runs with or encloses the circuit conductors. What are the steps for plotting points on microstation uisng offset, station, side and elevation? According to that same definition, the branch circuit ends at an outlet. According to Note 1 of Table 450.3(B), transformers having a primary current rating of 9A or more are permitted to use the next size up rule when 125% of the primary current doesnt correspond to the standard rating of a fuse or nonadjustable circuit breaker listed in Sec.