The Minimum Size of Service for a Single-Family Dwelling Unit

question 23

Multiple Choice

The minimum size of service for a single-family dwelling unit permitted by the NEC is __________ amperes.

• A) 60
• B) 75
• C) 100
• D) 150

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Definitions:

Fixed Cost

Fixed costs, including rent, salaries, and insurance, stay the same no matter how much is produced or sold.

Contribution Margin

The amount remaining from sales revenue after variable costs are deducted, contributing towards covering fixed costs and earning profit.

Break Even Point

The point at which total costs and total revenue are equal, meaning the business is neither making a loss nor a profit.

Unit Contribution Margin

The amount each unit sold contributes towards covering fixed costs and generating profit, calculated as the sales price per unit minus variable cost per unit.