Question 1 of 10
According to NEC 110.26, what is the primary purpose of electrical panel clearance?
NEC 110.26 focuses on creating a safe working environment around electrical equipment.
Question 2 of 10
For equipment rated 1000 volts or less, what determines the required depth of the working space in front of an electrical panel?
The required depth is determined by voltage to ground and the conditions across from the equipment according to NEC 110.26(A).
Question 3 of 10
What is the minimum width of the working space required in front of an electrical panel?
The working space width must be the width of the equipment or at least 30 inches, whichever is greater, according to NEC 110.26(A).
Question 4 of 10
What is the minimum height of the working space above the floor or platform?
The working space must extend from the floor or platform up to 6.5 ft or the height of the equipment, whichever is greater, according to NEC 110.26(A).
Question 5 of 10
How far must equipment doors or hinged panels be able to open?
Equipment doors or hinged panels must be able to open at least 90 degrees according to NEC 110.26(A).
Question 6 of 10
Can the required working space in front of an electrical panel be used for storage?
The required working space cannot be used for storage according to NEC 110.26(A).
Question 7 of 10
What is the dedicated electrical space above an electrical panel, according to NEC 110.26(E)(1) for indoor installations?
The space equal to the width and depth of the equipment must be dedicated from the floor to 6 feet above the equipment or to the structural ceiling, whichever is lower, according to NEC 110.26(E)(1).
Question 8 of 10
What type of systems should generally be kept out of the dedicated electrical space above a panel?
Foreign systems such as piping, ducts, etc. should generally be kept out of the dedicated zone according to NEC 110.26(E)(1).
Question 9 of 10
If you are dealing with a 277/480V system, can you always assume the working space depth is 3 feet?
No, you should always check the actual condition, as higher-voltage systems may require more than 3 feet depending on the setup according to NEC 110.26(A).
Question 10 of 10
Which of the following is NOT a common field mistake related to electrical panel clearance?
Providing adequate access is not a mistake, it's a requirement. The other options are common mistakes according to the article.
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