LLC Study Guide 2026
Everything you need to pass the LLC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 LLC Exam Format at a Glance
📚 LLC Topics to Study (63)
✍️ Sample LLC Questions & Answers
1. An installer finds existing landscape wiring spliced inside a weathertight junction box buried underground without conduit fill. What NEC violation exists?
NEC Section 300.15 requires that all junction boxes remain accessible; a buried box without an accessible cover violates this rule.
2. A 150-watt capacity transformer is powering fixtures that total 148 watts. Several fixtures are dim. The MOST likely cause is:
Operating near maximum capacity causes increased resistance and heat in the transformer, leading to voltage drop and dim fixtures.
3. Why is it important to document 'before' and 'after' voltage readings at fixture terminals in a PM report?
Before-and-after voltage documentation proves the value of PM work by showing measurable improvements in system voltage and performance resulting from the technician's actions.
4. On a set of landscape lighting plans, what does 'Sheet L-1 of 3' indicate?
The sheet designation 'L-1 of 3' identifies this as the first sheet in a set of three landscape (L) drawings.
5. What is the recommended maximum load percentage for a low-voltage landscape lighting transformer to ensure long-term reliability and efficiency?
Loading a transformer to no more than 75% of its rated capacity reduces heat buildup and extends component life, improving system reliability.
6. When landscape lighting conductors are run in PVC conduit underground, the minimum burial depth under a public sidewalk is:
NEC Table 300.5 requires PVC conduit under sidewalks to be buried at least 12 inches deep.