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Self-Test 1 Q&A 4-8

Self-Test Questions Volume 1

Briefly describe the construction of nonmetallic sheathed cable. NM cable consists of two or three insulated conductors in an outer sheath. It may have insulated or bare conductors for equipment ground. The outer sheath is made of either thermoplastic or treated braids.
What are two characteristics of the outer covering of nonmetallic cable? It is flame retardant and moisture resistant
Describe the conductors found in nonmetallic cable. Conductors may be copper, aluminum, or copper-clad aluminum. Copper conductors range in size from No. 14 to No. 2 AWG, and aluminum and copper-clad aluminum from No. 12 to No. 2 AWG.
What markings are normally found on nonmetallic cable? The information required must show the manufacturer’s name or trademark, maximum working voltage, wire size, and cable type.
In what types of buildings may NM cable be installed? Its use is permitted in one- and two-family dwellings and other structures that do not rise more than three floors above grade.
Where in a building may type NM cable be installed? Type NM cable can be placed or fished through air voids in masonry block or tile walls that are not subject to too much moisture or dampness.
How does NMC-type cable differ from NM-type cable? NMC cable covering is fungus resistant and corrosion resistant.
Where may type NMC cable be used? In the same places as type NM cable, plus moist, damp, and corrosive locations. These locations include outside masonry block and tile walls.
What determines switch and outlet placement when detailed wiring specifications for a building are not furnished? The NEC® and the electrician's experience
What principle does an electrician use as much as possible when routing circuits? A straight line is the shortest distance between two points
Where will most circuits be in a one-story residence? Most circuits in a one-story residence are run overhead. Wiring is routed up from the distribution panel to the ceiling and then spread out across the ceiling area.
How far must you anchor cable from a box or cabinet? 12 inches.
How is concealed cable usually fastened to framing members? Fasten concealed cable using staples to framing members.
How should diagonal running cable be fastened to joists in an attic? The diagonal cable is stapled at every other joist. This is done to keep from exceeding the 41/2-foot support requirement. Cable run at right angles can be stapled at every third joist (this assumes joists are on 16-inch centers)
How should you fasten cable that is parallel to the joists? It is best to attach it to the side.
Guard strips must be used on cable how many feet from the scuttle hole? Within 6 feet.
When exposed circuits are put in, how should cable be installed? To follow the surface of the building finish closely or be installed on running boards.
Where should cable be attached on the stud when it is run to a box mounted flush with the face of an open stud? To the side of the stud.
How is cable installed on a finished surface usually anchored? With cable straps
What is the difference between a cable anchor for a cable with No. 8 conductors and one for a cable with No. 12 conductors? A round cable strap is used for a cable with No. 8 conductors, while an oval cable strap is used for one with No. 12 conductors.
When making bends in nonmetallic cable, what must be the size of the radius of the bend? Not less than five times the cable's diameter.
What is the least protection required for exposed cable that passes through a floor? Cable must be protected to at least 6 inches above floor level by rigid or intermediate conduit or pipe.
What action is required where exposed cable on a wall may be vulnerable to physical damage? It should be protected with conduit, pipe, or guard strips
What is meant by concealed wiring? Wiring installed between floors and ceilings of multi-level buildings, in the ceilings of finished basements, and in the walls of buildings. It is not visible or easily accessible after the building is finished.
What does wooden framing require to install concealed wiring? Bored holes or notches
What size bit is usually used to install concealed lighting and outlet circuits in a building? From 5/8 to 3/4 inch in diameter.
Why is it particularly undesirable to drill cable holes in 2 by 4 studs at any angle other than horizontally? The specified 1¼ inch between the hole and the edge of the stud cannot be met, and the cable must be protected from nails or screws. Metal sleeves or plates at least 1/16-inch thick is used for this purpose.
How is concealed cable installed when metal studs are used? Either holes or slots are used. Holes in metal members must have bushings or grommets inserted securely to prevent damage to the cable covering. A steel sleeve, plate, or clip must be placed wherever a cable might be punctured or cut by a nail or screw.
What actions are taken between the time the distribution panel is installed and the start of cable installation when circuits are being installed? Mark the location of the outlet boxes. The boxes are then mounted in place unless the mounting of a box might interfere with hole boring or cable anchoring. The needed holes or notches are made for the installation of the cable.
Describe the cable usually used for installing branch circuits and the way in which it is packaged. Cable used for branch circuits is usually 12/2 with ground and comes as a 250-foot coil in a carton or box.
How is cable removed from its carton? The end of the cable is grasped through the hole in the top of the carton and pulled out. Since the cable comes out as a spiral, it must be uncoiled before use.
What happens if cable is used without being uncoiled? It develops sharp kinks that damage the insulation and prevent its being pulled through bored holes.
What is the purpose of providing 6 inches of conductor inside an outlet box? This amount of conductor is needed to make splices or to attach devices or fixtures easily
How does the procedure for installing cable in a box differ from that previously used when the box does not have cable clamps? A knockout must be removed from the box and a cable connector installed to provide a means of anchoring the cable to the box.
How should you install cable in a nonmetallic box that does not have clamps? After stripping the cable end, remove one of the box knockouts. Then install a cable connector in the knockout hole. Put the cable end through the connector to expose one-quarter inch of the outer cover and fasten it in place.
What should you do before starting to run cable when holes through framing members are involved? When holes are involved, you must plan ahead for easiest installation and the least waste
Created by: RenegadeWolf
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