Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Working Space and Clearances Flashcards

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  1. What is the maximum voltage allowed to still qualify for the 3-foot minimum working space depth under Condition 1 per NEC 110.26(A)(1)?

    Answer: 600V nominal or less

    NEC 110.26(A)(1) Table applies to equipment operating at 600V nominal or less, with Condition 1 requiring a minimum 3-foot working space depth for this voltage range.

  2. A technician needs to work on a 480V panelboard where one side has an exposed energized bus and the opposite side has a concrete block (grounded) wall. Which working space Condition applies?

    Answer: Condition 2

    Condition 2 applies when there are exposed live parts on one side and grounded parts (such as a concrete/masonry wall) on the other side.

  3. According to NEC 110.26(C)(1), how many means of egress are required for a room with electrical equipment rated 1200A or more and over 6 feet wide when the room exceeds 50 feet in length?

    Answer: Two entrances located at each end of the working space

    NEC 110.26(C)(1) Exception requires two entrances located at each end of the working space for rooms exceeding 50 feet in length with large equipment.

  4. Pipes, ducts, or equipment foreign to electrical installations are permitted in dedicated electrical space under which condition?

    Answer: Never — NEC strictly prohibits all foreign systems

    NEC 110.26(F)(1)(b) states that the dedicated space shall not be used for piping, ducts, leak protection apparatus, or any equipment foreign to the electrical installation.

  5. What is the required working space depth for 480V equipment (Condition 2) per NEC 110.26(A)(1)?

    Answer: 4 feet

    Per NEC 110.26(A)(1) Table, for voltages from 151V to 600V under Condition 2, the minimum working space depth is 3.5 feet.

  6. Which NEC provision allows the working space in front of electrical equipment to serve as egress, and what is the key requirement?

    Answer: NEC 110.26(C)(2) — the path must not pass through the working space of other equipment

    NEC 110.26(C)(2) permits the working space to serve as an egress path, but the path must not require passing through the working space of other electrical equipment.

  7. For outdoor electrical equipment, what does NEC 110.26(F)(2) require regarding dedicated space?

    Answer: Outdoor equipment is exempt from dedicated space requirements

    NEC 110.26(F)(2) states that outdoor electrical equipment is not required to have a dedicated electrical space, as this provision applies only to indoor installations.