Table of Contents
What is a general NEC requirement for installing boxes?
Terms in this set (15) The following is a general NEC requirement for installing boxes? The finished installation must be accessible for future maintenance and repair.
Which type of boxes are typically used for wall mounted?
Octagon and standard-size round boxes range from 1 1/2 to 3 inches deep and are the standard box for ceiling- or wall-mounted light fixtures weighing up to 50 pounds. They provide much more room for wiring than shallow round pan boxes and can be used as junction boxes.
Which item increases the capacity of an outlet box?
Devices that add to box capacity include device covers and extension rings. fixture studs, hickeys, cable clamps, switches, receptacles, and conductors.
What is the maximum weight allowed by the NEC when ceiling fans are mounted directly to an approved unmarked outlet box?
If the maximum weight isn’t marked on the box, and the fan weighs more than 35 lbs, the fan must be supported independently of the outlet box. Ceiling paddle fans greater than 70 lbs must be supported independently of the outlet box.
Which NEC article covers requirements for device boxes?
Article 314 of the National Electrical Code covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.
Where are boxes required NEC?
A box shall be installed at each outlet and switch point for concealed knob-and-tube wiring. Fittings and connectors shall be used only with the specific wiring methods for which they are designed and listed.
What is weatherproof box?
Weatherproof boxes are the solution to achieving a weatherproof connection point outside. These boxes, when connected properly, seal out the weather without worry of moisture getting in and shorting out the connection.
Which of the following covers the installation of emergency systems?
NEC 2012, Article 700, “Emergency Systems,” covers electrical safety in the installation, operation, and maintenance of emergency systems.
What are some of the applications of device boxes?
Device boxes are used to house wiring devices such as switches or receptacles. Device boxes are used to house wiring devices such as switches or receptacles. Device boxes are used to house wiring devices such as switches or receptacles. Device boxes are used to house wiring devices such as switches or receptacles.
How do you increase the size of an electrical box?
You have two options: Add a plastic surface-mount extender box (like Leviton No. 6197-W; available through our affiliation with amazon.com; Photo 1), or remove the old 12.5-cu. -in. box and replace it with a flush-mount 20-cu.
What counts as two conductors when used in a box?
If one size conductor is in the box, the hickey counts as one of these conductors. Luminaire (fixture) studs and hickeys are quite often installed in the same box, and where they are, they are counted as two conductors. For example, a metal octagon box contains one luminaire (fixture) stud and one hickey.
Which of the following covers the installation requirements for cable tray?
NFPA 70 – The National Electrical Code covers the installation requirements for the safe application of cable tray systems including ladder, ventilated trough, ventilated channel, solid bottom and other similar structures.
What is the minimum depth required by the NEC for a round box?
The box is a minimum of 1.5 inches deep. Boxes must meet the minimum cubic inch capacity per number of conductors per Table 314-16(a) and Table 314-16(b) of Article 314 in the NEC.
How much weight can a new work ceiling box hold?
How heavy of a light fixture or ceiling fixture can a listed ceiling box support? A ceiling box can support a fixture of 50 pounds or less. A ceiling box rated for “fan support” can support a fan of 35 pounds or less.
What is the allowable length in installing boxes behind the surface of non combustible materials?
In walls or ceilings constructed of noncombustible material (concrete, tile, etc.), boxes must be installed so that the front edge will not be set back more than 1/4 inch from the finished surface.
What is Article 314 of the NEC used for?
Article 314 of the National Electrical Code® covers the installation and use of boxes. The article includes table references that guide the electrician in the selection of the proper box size necessary to safely accommodate electrical service requirements.
What article of the NEC covers device box selection and installation?
314.28 Pull and Junction Boxes Chapter 3 of the National Electrical Code (NEC) covers wiring methods and materials. Article 314 covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.
Which of the following installations are covered by the NEC?
Now the scope of the NEC mentions that the NEC covers the installation and removal of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables and raceways.
Why is box fill important?
Understanding Box Fill Calculations: Must-Have Knowledge for Installers and Inspectors – NEC 2017, Article 314.16. Can you do a box fill calculation at the jobsite? This is an important skill for installers and inspectors alike, since a box that is overfilled can cause a fault, arcing, or even a fire.
What is the importance of proper mounting of electrical boxes?
Electrical boxes can be mounted on wall surfaces, behind walls and in recesses, or even on ceilings. This flexibility of installation makes them incredibly useful for a number of different applications, like: Splicing or joining wires in electrical circuits and wiring.
How do you waterproof enclosures?
There are many ways you can make a waterproof enclosure. You can make use of enclosures such as O-rings and gaskets. You can also make use of overmolding or injection molding. However, there are times you might need to use the two.
What are some of the requirements covered by Article 310?
As indicated by the scope of Article 310, this article covers general requirements for conductors rated up to and including 2000 volts and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses. This article on conductors has been a part of the Code since the 1947 NEC.
Which one of the following installations would be covered by the National Electrical Code?
The following installations are now covered by the rules in the NEC: Installations supplying shore power to ships and watercraft in marinas and boatyards. Installations used to export electric power from vehicles to premises wiring or for bidirectional current flow.
What does Chapter 7 of the NEC cover?
Chapter 7 of the National Electrical Code includes many articles, such as Emergency Systems (Article 700); Legally Required Standby Systems (Article 701); Optional Standby Systems (Article 701); Class 1, 2, and 3 Remote Control, Signaling, and Power-Limited Circuits (Article 725); Fire Alarm Circuit Wiring (Article 760 Apr 15, 2021.
