10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free CS questions are organized by exam domain, so you can see how each part of the Cable Splicing Certification blueprint is tested. Reveal the answer and explanation under each question.
Single-pole switching leaves one supply phase open to an unloaded transformer fed through a long underground cable. Recordings show sustained, irregular overvoltages, and the transformer becomes unusually noisy. The disturbance persists well beyond the initial switching transient. What mechanism best accounts for this pattern?
Correct answer: A - Ferroresonance involving cable capacitance and transformer core saturation.
A cable's metallic shield is bonded at one end and insulated at the other under an engineered single-point bonding design. A proposed change would add a permanent bond at the insulated end. What electrical consequence must be considered before approving that change?
Correct answer: C - It can create a shield-current loop and increase heating under normal load.
A splice detail locates the insulation-shield edge 8 3/8 in from the cable end. The jacket edge is to be another 3 5/8 in toward the unprepared cable. The specified tolerance for the resulting jacket cutback is plus or minus 1/8 in. Before cutting, the crew marks the jacket at 11 15/16 in from the cable end. How should the inspector assess that mark?
Correct answer: A - Accept; the mark is within tolerance of the required 12-in cutback.
A worker collapses in a permit-required cable vault as the atmospheric monitor alarms. The worker is attached to the installed retrieval system, and the vertical retrieval path is clear. The attendant is trained and authorized to perform non-entry rescue under the site's plan; electrical hazards remain controlled. What should the attendant do now?
Correct answer: A - Activate emergency rescue and begin the planned non-entry retrieval from outside the vault.
An engineer is specifying a transition splice between existing paper-insulated lead-covered (PILC) cable and new XLPE cable. Which design requirement is distinctive to the PILC end, rather than common to both cable constructions?
Correct answer: B - Containing impregnating compound and sealing the paper-insulation and lead-sheath system.
Before a cold-shrink splice is assembled, an inspector finds a streak of transferred semiconductive residue on the exposed XLPE insulation. The residue lifts onto a clean wipe; the underlying insulation is smooth and undamaged. Cutbacks and insulation diameters meet the kit's requirements. What is the appropriate disposition?
Correct answer: C - Remove the residue with the specified cleaner and fresh lint-free wipes; then reinspect.
During a prescribed voltage test with no load connected, partial-discharge activity is localized to the internal dielectric interface of a newly installed molded splice. Connector contact resistance and metallic-shield continuity meet their acceptance criteria. Which assembly defect best fits the evidence?
Correct answer: D - A trapped air pocket between prepared primary insulation and the molded splice body.
A switching order calls for opening a sound loadbreak elbow carrying 110 A of normal load. The elbow and mating interface are rated to interrupt 200 A at the system voltage. No fault is suspected, and the qualified operator has met all manufacturer and employer conditions for the authorized live-line operation. Which instruction correctly applies the equipment's switching capability?
Correct answer: D - Open the elbow under load using the specified live-line switching procedure.
A one-line diagram shows these connections: Source S1 feeds Bus X through switch A; Source S2 feeds Bus X through switch B; Bus X feeds cable W through switch C. Both sources are energized. A is OPEN, while B and C are CLOSED. Identify the source path that remains connected to cable W.
Correct answer: B - S2 only, through switches B and C.
A completed splice passes its specified insulation-resistance test. A separate, repeatable four-wire measurement across the conductor connection is 82 micro-ohms; the project maximum is 50 micro-ohms under the test conditions used. The low-resistance instrument and connections have been verified. Which conclusion is supported by these results?
Correct answer: B - Contact resistance fails the project criterion despite the acceptable insulation-resistance result.
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