Today’s drills

Your question asks for the allowable ampacity of insulated copper conductors rated 0 to 2000 volts. Which table do you open first?

• ATable 310.16
• BTable 250.122
• CTable 314.16(B)
• DTable 430.250

Pick an answer to see the work and why each wrong choice traps people.

A 120-volt branch circuit runs 70 feet one way on 12 AWG copper carrying 16 amps.

What is the approximate voltage drop? (K = 12.9, 12 AWG = 6530 cmils)

• AAbout 4.4 volts
• BAbout 2.2 volts
• CAbout 8.8 volts
• DAbout 0.7 volts

Pick an answer to see the work and why each wrong choice traps people.

Which table sizes the grounding electrode conductor?

• ATable 250.66
• BTable 250.122
• CTable 310.16
• DTable 220.12

Pick an answer to see the work and why each wrong choice traps people.

A single continuous-duty motor has a table full-load current of 28 amps.

What minimum branch-circuit conductor ampacity does it need?

• A35 amps
• B28 amps
• C31.5 amps
• D22.4 amps

Pick an answer to see the work and why each wrong choice traps people.

What is the maximum fill for a single conductor in a raceway?

• A53 percent
• B40 percent
• C31 percent
• D60 percent

Pick an answer to see the work and why each wrong choice traps people.

In a box-fill count, how many conductors does a single device yoke count as?

• ATwo
• BOne
• CZero
• DFour

Pick an answer to see the work and why each wrong choice traps people.