In this episode of The Build Show, CJ Nielsen dives into the fundamentals of underground pull boxes—often called Christie boxes—and explains why they’re a critical component of well-planned electrical infrastructure. CJ walks through the different types, sizes, and ratings of pull boxes, showing how they’re used to manage direction changes in underground conduit runs, stay within code-required bend limits, and simplify long wire pulls. Filmed on an active jobsite, he demonstrates real-world applications where pull boxes function as both pull points and rated junction boxes, while also discussing best practices for trench layout, drainage, service loops, and long-term accessibility. From future-proofing underground systems to avoiding unnecessary splices, this episode offers builders and electricians a clear, practical understanding of how pull boxes support cleaner installs, easier maintenance, and smarter infrastructure planning.

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CJ Nielsen's Episodes
CNC Electric