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NEC Table 430.52 shown in part.

#1) 430.52 Motor Branch-Circuit Short-Circuit and Grou...

This is a portion of NEC Table 310.16. At the bottom of the table is the following note: *Refer to 240.4(D) for conductor overcurrent protection limitations.

#2) Ampacity Table 310.16.

Use the image to answer the question.

#3) 314.28 Pull and Junction Boxes and Conduit Bodies....

Use the image of Table 310.15(C)(1) to help answer the question.

#4) 310.15(C)(1) Adjustment Factors for More Than Thre...

Use the angle pull image to help answer the question.

#5) Angle Pulls, U Pulls and Splices & Table 312.6(A).

To find missing values using the Ohms Law calculator, simply cover the letter to be determined and either multiply or divide the other two values represented by the remaining letters.

#6) Watts, Volts, Ohms.

This is a portion of NEC Table 310.16. Not all values shown.

#7) Ampacity Table 310.16.

Tap conductors cannot be smaller than the branch circuit conductors. If a 4 AWG branch circuit conductor is needed for the branch circuit then the tap conductors will need to be at least 4 AWG as well. Sometimes they might need to be larger.

#8) 430.28 Motor Feeder Taps. 25 Foot Tap Rule.

The ungrounded phase conductors are of different polarity and there is a difference in potential between them.

#9) Types of Circuits.

The image above shows a portion of NEC Table 430.250 and a three-phase motor nameplate.

#10) 430.6 Ampacity and Motor Rating Determination.

Enclosures containing a straight pull with insulated conductors of 4 AWG or larger are sized no less than 8 times the trade size of the largest raceway.

#11) 314.28 Pull and Junction Boxes and Conduit Bodies....

Calculating resistance in series and parallel circuits.

#12) Resistance.

The window above the show window is also included when determining the required receptacle spacing for a show window.

#13) Article 100 Definitions. Show Windows.

Use the image to help answer the question.

#14) 314.16 Number of Conductors in Outlet, Device, and...

Feeders serving a group of motors must have an ampacity based on 125% of the largest motor FLC value plus the sum of the other motor FLC ratings in the group.

#15) 430.24 Several Motors or a Motor(s) and Other Load...

Try the <a href="http://www.cooperindustries.com/content/public/en/bussmann/electrical/resources/fc2.html" target="_blank"><strong>FC<sup>2</sup></strong></a> calculator and compare your math to the old school calculation in the image. Change the length of wire to see how it impacts the available fault current.

#16) 409.22 Short-Circuit Current Rating.

Tap conductors cannot be smaller than the branch circuit conductors. If a 4 AWG branch circuit conductor is needed for the branch circuit then the tap conductors will need to be at least 4 AWG as well.

#17) 430.28 Motor Feeder Taps. 10 Foot Tap Rule.

Use the image of the NEC tables to help answer the question.

#18) 210.19(A)(1) Conductors - Minimum Ampacity and Siz...

The image above shows a portion of NEC Table 430.250 and a three-phase continuous duty motor nameplate.

#19) 430.22 Motor Branch Circuits.

Overcurrent devices must have an interrupting rating at least equal to the current that is available at the line terminals. Passive devices like the lighting contactor just need to have an interrupt rating at least equal to the current they are interrupting.

#20) 110.9 Interrupting Rating.

Use the angle pull image to help answer the question.

#21) 314.28 Pull and Junction Boxes and Conduit Bodies....

Use the image to help answer the question.

#22) 314.16 Number of Conductors in Outlet, Device, and...

$Calculations of ampacity are permitted to be rounded to the nearest whole ampere, with decimal fractions smaller than 0.5 dropped.$

#23) 220.5 Calculations.

Use the image to help answer the question.

#24) 215.2(A) Feeders. Minimum Rating and Size.

Use the image of Table 310.15(B)(1)(1) to help answer the question.

#25) 310.15(B)(2) Raceways and Cables Exposed to Sunlig...

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