Installation Techniques & Procedures Flashcards
7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Installation Techniques & Procedures flashcards as text
During cable tray installation, what minimum clearance above a cable tray is typically required for maintenance access?
Answer: 12 inches
A minimum of 12 inches of clearance above cable trays is generally required by standards to allow for cable installation and future maintenance.
A technician must install a wall-mounted bracket rated for 200 lbs. The stud finder shows studs 24 inches apart but the bracket only spans 18 inches. What is the best solution?
Answer: Use a backing board spanning two studs, then mount the bracket to the backing board
A backing board transfers load to two studs even when bracket spacing doesn't align with stud spacing, safely meeting the load rating.
When installing flexible conduit (flex), what is the maximum unsupported length typically allowed between supports?
Answer: 3 feet
The NEC generally requires flexible conduit to be supported at intervals not exceeding 4.5 feet (approximately every 3 feet in practice) and within 12 inches of each box.
What technique should be used to prevent galvanic corrosion when fastening aluminum components to steel structure?
Answer: Use an isolating washer or anti-corrosion coating between dissimilar metals
Isolating washers or dielectric coatings prevent direct metal-to-metal contact, stopping the electrochemical reaction that causes galvanic corrosion.
When mounting equipment on vibrating machinery, which mounting technique is essential to prevent fastener loosening?
Answer: Use locking fasteners such as nylon insert nuts or thread-locking compound
Nylon insert nuts and thread-locking compounds resist vibration-induced rotation that causes standard fasteners to back out over time.
What is the correct method for making a watertight conduit entry into an outdoor electrical enclosure?
Answer: Use a listed weatherproof conduit hub with gasket and seal all openings
Listed weatherproof hubs with gaskets and properly sealed openings maintain the enclosure's NEMA/IP rating and prevent moisture intrusion.
When installing a ceiling fan rated at 35 lbs on an existing outlet box, what must the installer verify first?
Answer: That the outlet box is rated for fan support (not just luminaire support)
Fan-rated boxes are designed to handle the combined weight and dynamic movement loads of a ceiling fan; standard light fixture boxes are not.