When are junction boxes required in electrical installations?

Junction boxes are essential in electrical installations, particularly when there are splices or changes in wiring direction. Their primary function is to protect and house the electrical connections, which helps prevent electrical hazards such as shorts and fire risks. Junction boxes also provide a safe location where wires can be joined, facilitating maintenance and future alterations.

Situations that involve splices or changes in wiring direction require junction boxes to ensure that connections are secure and adequately insulated. This adherence to safety standards reduces the likelihood of exposed wires, which could lead to shock hazards or other dangerous conditions.

The other scenarios, while relevant to electrical work, do not inherently necessitate the use of junction boxes. For instance, connecting to a main power source may utilize service entrances and does not always require a junction box. Installing outdoor lighting might utilize various fixtures and methods that do not necessarily involve a junction box, depending on the installation's configuration. Similarly, using larger gauge wire does not dictate the need for a junction box unless splices or directional changes are occurring. This highlights the specific function of junction boxes as a protective measure in managing wiring complexity.