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Limited energy / low voltage technician practice test

149 free practice questions for this exam, each with the reason for the answer and where to look it up.

Low voltage and structured cabling: practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

Practice tests that prepare you for this exam

Low voltage and structured cabling

Copper and fibre cabling, terminations, pathways, grounding, power-limited circuits, security and access systems, testing and safety for limited energy licences and cabling certifications.

149 questions for this exam

About the exam

ExamLimited energy / low voltage technician
Who runs itState boards
WhereUnited States (varies by state)

Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.

Sample questions

Which pair lands on pins 4 and 5 in both the T568A and the T568B wiring schemes?

  1. The blue pair
  2. The orange pair
  3. The green pair
  4. The brown pair
Show the answer

A. The blue pair

The blue pair (pair 1) sits on the centre pins 4 and 5 in both schemes, and the brown pair is on 7 and 8 in both. Only the orange and green pairs change places between T568A and T568B.

Reference: ANSI/TIA-568 series, pin and pair assignments (T568A and T568B)

What jacket colour identifies indoor OM3 or OM4 laser-optimised multimode cable?

  1. Orange
  2. Aqua
  3. Yellow
  4. Lime green
Show the answer

B. Aqua

OM3 and OM4 are jacketed aqua. Orange is used for the older OM1 and OM2 multimode, yellow for single-mode and lime green for OM5 wideband multimode.

Reference: ANSI/TIA-598, fibre colour coding

Under the telecommunications pathway standard, what is the most bending allowed in a conduit run between pull points?

  1. One 90-degree bend (90 degrees total)
  2. Three 90-degree bends (270 degrees total)
  3. Four 90-degree bends (360 degrees total)
  4. Two 90-degree bends (180 degrees total)
Show the answer

D. Two 90-degree bends (180 degrees total)

Telecommunications conduit is limited to the equivalent of two 90-degree bends between pull boxes so that cable can be pulled without exceeding its tension limit. Four quarter bends (360 degrees) is the general limit in the electrical code for power raceways, and it is too many for data cable.

Reference: ANSI/TIA-569, conduit pathways

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