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Question 33

You are designing a horizontal distribution system that will have a zone box located 71.6 m (235 ft) away from the telecommunications room (TR). A 50 mm (2 in) conduit is designed from the TR to a pull box located 36.6 m (120 ft) away from the TR. A 1 1/2 inch conduit is designed from the pull box to the zone box located

35.1 m (115 ft) beyond the pull box. Assuming no conduit bends, and excluding the TR and zone box, what is the total number of pull boxes/pull points required in this horizontal conduit system between the telecommunications room (TR) and zone box?

    Correct Answer: B

    For a horizontal conduit system, pull boxes are generally required every 100 feet if no bends are present. The distance from the telecommunications room (TR) to the first pull box is 36.6 meters (120 feet), requiring one pull box. The distance from the first pull box to the zone box is 35.1 meters (115 feet). There needs to be an additional pull box installed here because the distance exceeds 100 feet. Therefore, the total number of pull boxes/pull points required in the system is 3.

Discussion
CUB90Option: B

The answer is 3 pull boxes total. One pull box "A" already exists at 120ft from the TR. The second pull box "B" is to be placed between the TR and the pull box "A" because the distance is over 100 ft. The third pull box "C" is to be placed between pull box "A" and the zone box because the distance is over 100 ft.