Electrical Study Assignment

WHAT SIZE TW CONDUCTOR WOULD YOU USE FOR THE FOLLOWING... 1800 WATTS 125 VOLTS (Solve for the amps, then use page 161)

14

What's the maximum distance a 120V, single-phase 33A can be located so the voltage drop doesn't exceed FIVE percent? The load is wired with 8AWG.

16510*6=99060 2*21.2*33=13399.2 71'

What is the ampacity of (3) 1/0 AWG THHN copper current-carrying conductors installed in E.M.T.?

170 amps

What is the voltage drop of two 10 AWH THHN conductors that supply 16 A, 115 V load located 215 ft from the source?

2*12.9*16*215=88725/10380=8.5502 VD=9

#4 TW Copper 250 volts 275 feet 75 amps What is the voltage drop?

2*12.9*75*275=532125/41740=12.74

What is the ampacity of (8) 8 AWG XHHW Aluminum current-carrying conductors installed in E.M.T. located in a dry location, in an ambient temperature of 60°C?

22 amps

COOKING EQUIPMENT DEMAND LOAD: What's the demand load for a 23 KW range in a dwelling unit? Use formula on page 78 and conductor on page 100

23-12=11*400=4400+8000=12400/240=52 amps conductor size is #6

How many AA batteries do you need for a toy that uses 12 watts of power and has a resistance of 3 ohms? ( AA batteries are 1.5 volts each)

24 batteries

Derating Conductor Review: I have a demand load of 27 amps my conduit is passing thru a room with a temperature of 37 C I have (12) ZW conductors in my conduit. What is the correct size conductor for my 27 amp load? Pages 159,161,160,100

27/.50/.88=61 amps #4 Conductor 70 amp breaker

What's the adjusted ampacity of 10 THHN conductors when nine current-carrying conductors are installed in a raceway or cable?

28A

The NEC recommends a voltage drop no greater than ____________________ percent for feeders and no greater than ____________________ percent total for feeders and branch circuits together.

3 , 5

You have a 120 v toaster that draws 2.6 amps. What is the power consumption of the appliance?

312 watts

You have a 120 v toaster the draws 2.6 amps. What is the power consumption of the appliance?

312 watts

I have a demand load of 34 amps my conduit is passing thru a room with a temperature of 40 C I have (7) THHN conductors in my conduit. What is the correct size conductor for my 34 amp load? Pages 159,161,160,100

34/.91/.70=53 amps #6 conductor 60 amp breaker

What size conductor is required for a 70A breaker that supplies a 65A non-continuous load where the terminals are rated 60°C?

4 AWG

What's the minimum size THHN conductor permitted to terminate on a 70A circuit breaker or fuse if the circuit breaker and equipment terminals are listed for 60°C conductor sizing?

4 AWG

CONDUIT FILL WHAT SIZE RMC CONDUIT IS NEEDED FOR THIS JOB 4- #6 TW 8- #10 THWN 3- #12 THW 10- #1 THHN 1- #8 BARE (Use annex C and page 696 chapter 9)

4- #6 TW = .0726*4=.2904 8- #10 THWN = 0.211*8=.1688 3- #12 THW =.0181*3=.0543 10- #1 THHN =.1562*10=1.562 1- #8 BARE 0.013 TOTAL=2.0885=3"

What is another term for electromotive force (EMF)?

Voltage

Grounded (grounding) is defined as being ____.

connected to ground or to a conductive body that extends the ground connection

For a given conductor size, which material has the greatest ampacity?

copper