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For the range discussed in problem 11: a. What size 60°C ungrounded conductors are required? ______________ b. What size 60°C neutral conductor is required? ______________ c. What size 75°C ungrounded conductors are required? The terminal block and lugs on the range, the branch-circuit breaker, and the panelboard are marked as suitable for 75°C wire. ______________ d. What size 75°C neutral conductor is required? Terminations are the same as in part (c). ______________

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EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
ISBN: 9781337516549

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Section
BuyFindarrow_forward

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
ISBN: 9781337516549
Chapter 20.2, Problem 12R
Textbook Problem
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For the range discussed in problem 11:

  1. a. What size 60°C ungrounded conductors are required? ______________
  2. b. What size 60°C neutral conductor is required? ______________
  3. c. What size 75°C ungrounded conductors are required? The terminal block and lugs on the range, the branch-circuit breaker, and the panelboard are marked as suitable for 75°C wire. ______________
  4. d. What size 75°C neutral conductor is required? Terminations are the same as in part (c). ______________

a.

To determine

State the required size of 60°C ungrounded conductors.

Explanation of Solution

Given data:

Refer problem 11 in the textbook.

Discussion:

The power rating of a double-oven electric range is 18kW. Refer table 220.55 in the textbook, the power rating of a double-oven (18kW) exceeds the maximum demand in column C (12kW) by (6kW). It is given that the maximum demand is 8kW for one number of appliance.

From table 220.55 note 1, each additional kilowatt of rating from the maximum demand in column C shall be increased by 5%. Therefore, the total percentage of increase of demand is (6×5%=30%). Hence, the amount of increase in demand is (8kW×0.3=2

b.

To determine

State the required size of 60°C neutral conductor.

c.

To determine

State the required size of 75°C ungrounded conductor.

d.

To determine

State the required size of 75°C neutral conductor.

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