In abc, abc is a right angle, ab=3 units, and bc= 2 units, abc is dilated by a scale factor of 0.5 with point b as the center of dilation, resulting i To solve the trigonometric inequality 2sin(x)=> -1, which two equations can be graphed? if a simple machine requires an effort force that is less than the force of the load being moved, then the simple machine exhibits..A. mechanical a What 2 colors can the grounded conductors (neutral) be? If your line has call forwarding activated, any incoming calls will ring once before they are forwarded. The expected life of electrical equipment is cut in half for every 21 degrees above the maximum operating temperature the equipment operates at. After checking your equipment and your calling features . In previous NEC editions, transformers didn't require a disconnecting means. There are other stipulations within the code that dictate how these devices can, and cannot be used. Added 12 days ago|1/3/2023 6:29:23 PM This answer has been confirmed as correct and helpful. Part (F) of the same section requires that the high leg be identified by a permanent plaque that reads, Caution _____ Phase Has _____ Volts to Ground, where it is necessary to fill in the correct phase amount of volts that are grounded. How could magic slowly be destroying the world? show work. Descriptions: A disconnecting means for a motor must do what 3 things? The most common resolution to FaceTime hanging up randomly is to reset the network settings on iPhone or iPad. 2003-2021. A plug and receptacle rated more than 20 amperes and used as a disconnecting means must be listed as a switch-rated plug and receptacle. calculated load to be supplied []. I'll cheat here because I saw your other question: Most general purpose NEMA motors are rated to operate at what % of the motor's rated voltage? Electrical Contractor Magazine, Gray Areas in the Code: Navigating uncertainty around service disconnects and more, Measuring Shore Power to Boats, Porch Eaves and More, Who's Responsible? What type of AFCI device is mandatory in the panel where the branch circuit originates? The National Electric Code stipulates disconnect requirements for water heaters. 517.45(A) covers the requirement for a battery or generator system. Strange fan/light switch wiring - what in the world am I looking at, What do these rests mean? Disconnecting Means. Published in category Computers and Technology, 30.10.2020 >> Electricians will sometimes call _____ "disconnects" or a "disconnecting means."A) SwitchesB) Three-pronged plugsC) Two-pronged plugsD) Electrical cords High watt density heating elements are generally what shape? What the exception for using GFCI protected receptacles for temporary power on a construction site? these programs are marketed by the school (clo2) marks a)-vocational schools b)-vendor training c)-colleges & universities d)-continuing education programs, An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. When does the neutral carry two hot conductor's combined load? Can a neutral conductor of a multi-wire branch circuit be shared when using AFCI and GFCI devices? Do all motors need a disconnect? A) Two pronged plugs B) Electrical cords C) switches D) Three-pronged plug 1 See answer Advertisement PeterPan58 Answer: D) Three-pronged plug Hope it helps u! @gregmac Individual breakers only satisfy the requirement if they can disconnect all ungrounded conductors in 6 or less moves. In a dwelling unit, it is not unusual to find at the circuit breaker panel these descriptions: lights, plugs (should be receptacles, but that is too long to write out) or simply lights and plugs. These might be in felt-tip marker, stick-on plastic labels or any number of makeshift methods. It depends on the degree and type of patient care given. Where the wiring method is exposed to the weather, it is considered to be in a wet location. 60 (Guitar). Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. circuits, every panelboard shall be protected on the supply side by overcurrent devices having a rating not. Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. Not close automatically. What is the difference between absorbed wavelengths and reflected wavelengths? circuits, one pole for each ungrounded conductor, as one multipole Animals that are members of different species and share a habitat What is the purpose of the capability assessment? Used as a permanent wiring method 2. The T&B Sta-Kon luminaire disconnect for two poles (LD2P) is the second generation of these . I make all the electrons line up for their Flu shots. This part requires a disconnecting means within sight of the water heater, or if more than 50 feet from the appliance, it must be capable of being locked in the off position. T/F - A GFCI protects against electrical shocks that occur when a person holds both the circuit conductors at the same time. This site is using cookies under cookie policy . One of the most important NEC requirements (and yet one most often ignored) is 110.22: Identification of Disconnecting Means. The service disconnecting means must be placed at a readily accessible location nearest the point of service conductor entry. It reads: Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident. (Both DC and AC). Type IC (can be buried in thermal insulation) 3. What do electricians call disconnects? A load where the maximum current is expected for 3 hours or more. . How is cable designated for use with submersible pumps marked? 5. In a commercial occupancy there are floor numbers and room numbers, so circuit identification is a simple matter; in an industrial occupancy there are machine descriptions (numbers, sizes) and it may appear that it is more important that these circuit disconnects be quickly identified. Your wrong. Reading through that though it specifies that it's for consumer's service not just a disconnect feeding a motor for instance, or a transformer or some other piece of equipment. 1. Thanks for contributing an answer to Home Improvement Stack Exchange! Oral surgery where the patient may be anaesthetized will have a different requirement from the normal dental office where dental hygiene and tooth repairs are done. One of the most important NEC requirements (and yet one most often ignored) is 110.22: Identification of Disconnecting Means. Branch/Feeder 3. What percentage of the Earth is covered with ocean? Uninstall teams - Restart system - Re-Install teams - Restart System 0 Likes Reply jbeade replied to user123955 For more, see. T/F - The code allows for conductors to be run between trees but not up the trunks of trees, F - The code allows cables to run up trees but cables cannot hang between adjacent trees, T/F - The earth is considered an effective ground-fault current path, T/F - Trenches should not be kback filled with rocks and debris, T/F - An underground installation is not considered a wet location. Wel for the question. loads of a single branch circuit, the branch circuit disconnecting - 241275 You can refer to the answers below. An air conditioning unit is installed outdoors where it is subjected to the weather. When a current carrying conductor breaks or becomes loose. @mjohns The lockable provision is only applicable to installations over 1000 volts. What size grounding-electrode conductor is required for three-phase, four-wire, 120/240-volt delta service? He can be reached at 504.734.1720. Jul 11, 2013. With the information shared above about electricians will sometimes call what disconnects , we hope we have brought useful knowledge and the best choices to you. T/F - Both the red and black wire can be connected to the same phases in a multiwire circuit, T/F - AFCI protection is not required in the unfinished basement area. Open all poles simultaneously 3. So the question here is whether or not it's allowable to use a lock at the circuit breaker for a furnace, in lieu of a separate service switch by the furnace. Which characteristic of water it form droplets? Electrical disconnects are switches that isolate all wiring in a home or other building from the source of power, typically the utility power service. A disconnecting means for a motor must do what 3 things? I will correct this. Building managers dislike potential liability. CNG is a readily available alternative to _________. In 210.11(C)(3) the Code requires a 20-ampere branch circuit to supply bathroom receptacles. OB. Open all poles simultaneously 3. "". At least one receptacle shall be installed in an attic with HVAC equipment how many feet from the equipment? EC. Oct 24, 2017 9:21 PM in response to MzMorgann. The disconnecting means for each supply permitted by 225.30 shall consist of not more than six switches or six circuit breakers mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard or switchgear. Unacceptable means of disconnect include control circuit devices such as pushbuttons, selector switches, and interlocks. Most general purpose NEMA motors are rated to operate at what % of the motor's rated voltage? If voltage is above the recommended level the lifetime is reduced and the lumen output is increased. We used to bring the supply thru the unit to a disconnect and then back in. capable of individual operation shall be permitted on multiwire In which case, the neutral shall be bonded to the ground at the meter and not the main panel (nor subpanels), right? I don't think a sub panel in that case needs a main but hopefully some of our canadian members will reply, "If the doors of perception were cleansed everything would appear to man as it is, Infinite. T/F - Travelers are always red and white wires. Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Generally speaking, when is it necessary to install a sub-panel for providing electricity to an outside shed/office? What temperature does the T/P relief valve open? An exception allows the conductor with the higher voltage to ground to occupy a different position when the switchboard or panelboard is in the same section as the metering equipment. More :A disconnecting means for a motor must do what 3 things? The maximum current draw for the overhead garage door motor and lights must not exceed what? In the end the AHJ/inspector rules, but one's interpretation of the code could leave room for using individual single pole devices. << Previous Question T/F - A GFCI does not limit the magnitude of the ground-fault current. F - It won't trip because the current flowing through both conductors is the same. An AC disconnect (also known as a fuse box or switch box) is for controlling the breakers and fuses that lead to your air conditioner. Emergency Disconnect - NEC 230.85 "For one- and two-family dwelling units, all service conductors shall terminate in disconnecting means having a short-circuit current rating equal to or greater than the available fault current, installed in a readily accessible outdoor location. The color of this conductor with the higher voltage to ground is orange or is identified by other effective means. In java. This can include a switch, a circuit breaker, a cord and plug connection (sometimes), or a group of the aforementioned devices. Disconnecting Means. Electricians will sometimes call ______ \"\"disconnects\"\" or a \"\"disconnecting means. How many supports do lighting tracks less than 4' have? disconnect, provided they are equipped with identified handle ties or 12 VAC T - What a GFCI does limit is the length of time that the ground fault flows. One of my colleague had faced the similar issue " every call i receive disconnects on answering. Having a main breaker is an excellent suggestion either way. 1. What letters are used for ungrounded terminal marking? Luminaires installed in a dropped ceiling must have what label? What is the diameter of a T5 fluorescent lamp? Open all poles simultaneously 3. T/F - Permanently installed fire alarm systems are not GFCI or AFCI protected? 3.In electrical terms, what is the definition of a disconnect? means shall have a rating of not less than 15 amperes. The first point I will make is that ALL electrical services to the home MUST have a means of shutting off all the power. 1. Does the National Electrical Code (NEC) permit Type NM cable in flexible metal conduit for this installation? Do dental offices require this standby source, automatic transfer equipment? George W. Flach was a regular contributing Code editor for Electrical Contractor magazine, serving for more than 40 years. A typical residential water heater is provided how many volts? Outlet 4. There shall be no How we determine type of filter with pole(s), zero(s)? How to tell if my LLC's registered agent has resigned? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Hax is in a mood today.. must be that time of month. What are the 3 types of recessed luminaires? What is the minimum and maximum cord lengths for a food disposal? T/F - Conduit body and boxes can serve as the grounding means instead of a grounding wire, T/F - All outlets in bedrooms require AFCI protection, T/F - The top receptacle of a duplex receptacle is recommended as the switched receptacle, F - The cords that are plugged into the top will cover the bottom receptacle, T/F - Suggested rotation of ceiling fan blades is to direct air up during the winter and down during the summer. CNG is a readily available alternative to gasoline, Electricians will sometimes call ______ disconnects or a disconnecting means. Discharge piping for the T/P relief valve must be installed how many inches above the floor? 1. It provides AFCI protection for both the branch/feeder and the outlets. rev2023.1.17.43168. This site is using cookies under cookie policy . The marking shall be of sufficient durability to withstand the environment involved." This answer has been confirmed as correct and helpful. Or does it need to be something more robust such as a sub-panel? For example, can a simple wall switch be considered a "disconnect"? The receptacle will be about 8 feet above the floor and will supply an information monitor. Article 422.30. For some appliances, this is simply a cord that can be unplugged from an outlet. What are 2 types of arcing that AFCI devices protect against? Open all poles simultaneously 3. a master handle to disconnect all ungrounded conductors with no more than Carcassi Etude no. which choice most likely describes the d What does it mean to be a part of an intellectual community? Based on the addition to this section and the information in 334.12(B)(4), which prohibits nonmetallic-sheathed cable in wet or damp locations, this cable cannot be used for this application. You can have a maximum of six service disconnects for each service permitted by 230.2, or each set of service entrance conductors permitted by 230.40 Ex 1, 3, 4, or 5 [230.71]. 1. Confirm that you want to reset network settings (this will lose all stored network . Not close automatically, T/F - An individual disconnect must be in sight of e controller and must disconnect the controller, The controller must be visible and not more than 50' from the disconnect, T/F - The disconnect does not need to be in sight of the motor and the driven machinery, T - Only if the disconnect can be individually locked in the open "OFF" position, T/F - Multiple disconnects are not needed if one disconnect is in sight of the (1) controller (2) motor (3) driven machinery.
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