Emt Compression Fitting Pull Apart Strength


15 amps

1440 watts (120 volts 1


20 amps

1920 watts (120 volts) 3840 watts (240 volts)


30 amps

2880 watts (120 volts) 5760 watts (240 volts)


40 amps

7680 watts (240 volts)


50 amps

9600 watts (240 volts)

Wire "ampacity" is a measu'eme'"' sa'eK Ampacity vanes accor \Vhen installing a new circuit i"." the circuit size For dea ting of the appliance an .\attage loao of the ci'cui

Wire Ampacities Volt

Use plastic cable staples to anchor cables to the sides of framing mem-Crocse staples sized to match the cables they anchor Stack-it

-facnmg up to four 2-wire cables to the side of a framing ies B) for 12.2 12 3 and all 10-gauge cables staples 3 or 12 2 cables coaxial staples (D> for anchoring ;aoies ben .vire staples lEi tor attaching telephone cables iGuid oe anchored within 8" of each electrical box and every ereatter

Use wire connectors wires voj are nnectm ,re connectors a'e coio'-cooeo o> .'ze but the coding scheme va'ies according to manufacturer The connectors shown above come *rom one mapr manufacturer To ensur safe connections each connector i rated for both minimum and maximum vvire capacity These connectors can be used to connect both conducting wires and grounding wires Green wire connectors are used only for grounding wires

House Plan 9665

Pulling cables through studs straight holes the sam st'ciightenmg -ne cable befc the studs

Pulling cables through studs straight holes the sam st'ciightenmg -ne cable befc the studs

How to Install NM Cable

Installing NM Cable

NM cable is used for all indoor wiring proiects except those requiring conduit (see pages 184 to 189) Cut and install the cable after all electrical boxes have been mounted Refer to your wiring plan (page 152) to make sure each length of cable is correct for the circuit size and configuration

Cable runs are difficult to measure exactly, so leave plenty of extra wire when cutting each length Cable splices inside walls are not allowed by code When inserting cables into a circuit breaker panel, make sure the power is shut off (page 192)

After all cables are installed, call your electrical inspector to arrange for the rough-in inspection Do not install wallboard or attach light fixtures and other devices until this inspection is done

Everything You Need

Tools: drill, bits, tape measure, cable ripper, combination tool, screwdrivers, needlenose pliers, hammer, fish tape.

Materials: NM cable, cable clamps, cable staples, masking tape, grounding pigtails, wire connectors, cable-pulling lubricant.

Cable Connectors For Breaker Panel

3 Shut off power to circuit breaker panel (page 192) a cable ripper to strip cable mg at least ot sheathing to the circuit breaker panel Cup away the excess sheathing

1 Drill holes in framing members for the cable runs This is done easily with a right-angle drill available at rental centers Holes should be set back at least 1 from the front face of the framing members

2 Where cables will turn corners (step 6. page opposite), drill intersecting holes in adjoining faces ot studs Measure and cut all cables. allowing 2 teet extra at ends entering breaker panel and 1 toot for ends entering electrical box

Wood Screen Door Hinges
form a slight L-shaped bend le and insert it into one hole Re'ri "e other noie using needieno"-

nd "J At the electrical bo* f member 8 from the against the front ot the bo« sheathing past the oo* edge marked line to the end using a away excess sheathing with the cable through the knockout

.able able

(continued next pagel 179

How to Install NM Cable (continued)

Cable Installation

How to Install NM Cable (continued)

1 fl Continue the .ircuit by nning cable between I" each oair ot electrical boxes, leaving an extra 'oot o! cable at each end

•f -4 At metal boxes anci I I knockouts and attach clamps From inside fixture sheathing Clip back length, then strip

"1 A do> •< J" Label the cabi- ring each bo* to mdicat

'" 13 in boxes .virina conti

.-.ires to make tm ier After

'Ough-in work is viewed bv


Compression Fitting Cutaway

Cutaway view

Cm at

3 Extend a lish tape do:, through the top olate the tape -eaches of the stud cavity F'o^ ished spacc beio/. piece of stiff /.ire one end to retne.e through the d'liied no! oottom piate-

How to Run NM Cable Inside a Finished Wall

Cm at

J cable the bind Ihem pulling lubnc fit the lish t..

Cutaway view


Bottom plate


Cutaway view

Cutaway view

6Fiom the iinuhed pull sleadiiv on the fish tape draw, the cabi up through the cavit\ Tins job will be eas ii vou have a helper teed the cabio lio beio. as vou pull

Hole cut

In wall

Tips for Running Cable Inside Finished Walls

To attic

Second story


Cable will be pulled from upstairs wall to downstairs wall

Cutaway view

' Top plate

To basement

Joist cavity

Hole cut in wall

Cutaway view

Joist cavity

Cable will be pulled along joist cavity from upstairs wall to downstairs wall

If there is no access space above and below a wall ipage opposite) cut openings in the finished walls to a cable This often occurs in two-story homes a cable is extended from an upstairs wall to a downstairs wall Cut small openings in the wall near tne top ana bottom plates then drill an angled 1 hoi through each plate Extend a fish tape into the 101st cavity between the walls and use it to pull from one wall to the next If the walls line up the other (left) you can retrieve the 'isn tape using a piece of stiff wire if walls do not line up mgri jsea second fish tape After running the caoi repair the holes in the walls with patching piaster -iiboard scraps and taping compound

Apply cable-pulling lubricant to the taped end of the fish tape when a cable must be pulled through a sharp bend Do not use oil or petroleum jelly as a lubricant because they can damage the thermoplastic cable sheathing

If you do not have a fish tape, use a length of sturdy mason s string and a lead tishing weight or heavy washer to fish down through a stud cavity Drop the line into the stud cavity from above then use a piece of stiff wire to hook the line from below

Pull Green Wire Emt

Elbow fitting is used in tight corners or for long conduit runs that have many bends. The elbow s cover can be removed to pull long lengths of wire.

Sweep forms a gradual 90°

bend for ease in wire pulling.

Compression fittings are used most frequently in outdoor IMC conduit installations where a ram tight connection is needed ^

Screw-in connectors or set-screw connectors are used to connect flexible metal conduit

Single-hole & double-hole pipe straps hold conduit in place against masonry walls or wooden framing members Conduit should be supported within 3 feet of each electrical box and titling, and every 10 leet thereafter

Nail straps are dnvei wooden framing merr to anchor conduit

Flexible metal conduit, available in /" and /" sizes, is used in exposed locations where rigid conduit is difficult to install Because it bends easily, flexible metal conduit often is used to connect permanently wired appliances, like a water heater


°g that in exposed locations oe- orotec'ed by rigid tubing called conduit e/a^oe cord^ t s used for wiring that runs ~asonry .-.a . a casement laundry and e/posed outdoor ing (pages 248 to 267) THHN THWN »vire (page 176) normally is in-staiieo nside conduit although UF or NM cabl can also be nstalled in conduit

There are several types of conduit available so check //ith your electrical inspector to find out which type meets code requirements in your area Conciui installed outdoors must be rated for exterior use Metal conduit should be used only with metal boxes never ith plastic boxes

Ai one time conduit could only be fitted by using elaborate bending techniques and special tools Now however a variety of shaped fittings are avail le to let a homeowner |om conduit easily

Install a green insulated grounding wire 'or any circuit that runs through metal conduit Although code allows the metal conduit to serve as the grou'X mg conductor most electricians install a green lated wire as a more dependable means of gro-. the system The grounding wires must be connecter to metal boxes with a pi tail nd grounding screw (left) or groun clip (right)

2000 Outdoor Rated Pigtails

Electrical Grounding in Metal Conduit

Underground Wire Pull Boxes Watertight

L-body fitting is used in outdoor conduit installations It has watertight threaded tit-tings and a removable cover that makes it easy to pull long lengths Of wire

IMC conduit is rated for outdoor use but can also be used indoors It is connected with watertight threaded fittings or compression fittings It is available m 10-toot lengths and m " and " diameters

Wire Capacities of Conduit

Intermediate Metallic Conduit Gill

EMT (Electrical Metallic Tubing)

IMC (Intermediate Metallic Conduit)

Rigid metal conduit

Conduit Y' in diameter can nolo

-aajge 12-oajae THHN THWÑ

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