What type of box is commonly used when circuits need to be split?

A junction box is specifically designed to accommodate wire connections where electrical circuits need to be split or spliced. This type of box provides a means to safely house the connections, allowing for multiple wires to come together from different circuits and then be redistributed further along those circuits. The junction box not only protects these connections from physical damage and environmental factors but also ensures proper electrical insulation and safety by containing the wiring within a rigid enclosure.

In practice, when you want to take power from one circuit and branch it out to feed another circuit, a junction box is used to make the necessary connections. This is compliant with the NEC guidelines, which emphasize the importance of safe and secure wiring practices.

The other options do serve important functions in electrical installations but are not primarily meant for splitting circuits. A ceiling box is typically used for mounting light fixtures; a termination box is used for terminating wires safely; and a pull box is designed to facilitate wire pulling and provide access for future maintenance or splicing, but does not specifically address the need for splitting circuits. Hence, junction boxes are the requisite choice for handling circuit splits properly and safely.