Question 10.13: A three-phase motor is located 175 ft from its source of pow......

Delmar’s Standard Textbook of Electricity [1086273]

A three-phase motor is located 175 ft from its source of power. The conductors supplying power to the motor are 1/0 AWG aluminum. The motor has a full-load current draw of 88 A. What is the voltage drop across the conductors when the motor is operating at full load?

Step-by-Step

The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.

$\mathrm{E}_{\mathrm{D}}=\frac{1.732 \times 17 ~\Omega-\mathrm{CM} / \mathrm{ft} \times 88 \mathrm{~A} \times 175}{105,500 ~\mathrm{CM}}$

$\mathrm{E}_{\mathrm{D}}= 4.298~ V$

Related Answered Questions

Question: 10.3

What is the maximum ampacity of a 4 AWG copper conductor with Type THWN insulation used in an area with an ambient temperature of 43° C? ...

Verified Answer:

Determine the ampacity of a 4 AWG copper conductor...

Question: 10.4

What is the maximum ampacity of a 1/0 AWG copper-clad aluminum conductor with Type RHH insulation if the conductor is to be used in an area with an ambient air temperature of 100° F? ...

Verified Answer:

Locate the column that contains Type RHH insulatio...

Question: 10.5

Twelve 14 AWG copper conductors with Type RHW insulation are to be run in a conduit. The conduit is used in an area that has an ambient temperature of 110° F. What is the maximum ampacity of these conductors? ...

Verified Answer:

Find the ampacity of a 14 AWG copper conductor wit...

Question: 10.11

The next problem concerns conductors used in a three-phase system. Assume that a motor is located 2500 ft from its power source and operates on 560 V. When the motor starts, it has a current draw of 168 A. The voltage drop at the motor terminals cannot be permitted to be greater than 5% of the ...

Verified Answer:

The solution to this problem is very similar to th...

Question: 10.8

Find the resistance of a piece of 6 AWG copper wire 550 ft long. Assume a temperature of 20°C. The formula to be used is: R = K × L/CM ...

Verified Answer:

The value for K can be found in the table in Figur...

Question: 10.1

Find the maximum operating temperature of Type RHW insulation. (Note: Refer to the NEC^®.) ...

Verified Answer:

Find Type RHW in the second column of Table 310.13...

Question: 10.2

Can Type THHN insulation be used in wet locations? ...

Verified Answer:

Locate Type THHN insulation in the second column. ...

Question: 10.12

A single-phase motor is located 250 ft from its power source. The conductors supplying power to the motor are 10 AWG copper. The motor has a fullload current draw of 24 A. What is the voltage drop across the conductors when the motor is in operation? ...

Verified Answer:

\mathrm{E}_{\mathrm{D}}=\frac{2 \times 10.4...

Question: 10.10

A manufacturing plant has a cooling pond located 4000 ft from the plant. Six pumps are used to circulate water between the pond and the plant. In cold weather, however, the pumps can freeze and fail to supply water. The plant owner decides to connect electric-resistance heaters to each pump to ...

Verified Answer:

The first step in the solution of this problem is ...

Question: 10.6

Assume that a motor with a full-load current rating of 28 A is to be connected with copper conductors that have Type THW insulation. The motor is located in an area with an ambient temperature of 30°C. The motor is not marked with NEMA^® code letters, and the termination temperature is not known ...

Verified Answer:

Since a motor load is continuous, multiply the ful...