Final answer:
Track lighting generally requires additional support for every four to six feet to prevent sagging. A line of eight feet would need extra support, while a line of seven feet requires one.
Step-by-step explanation:
The question relates to the installation of track lighting and at what intervals additional support is needed. When installing track lighting, it is crucial to ensure that there is enough support to hold the track in place securely. Support requirements can vary based on the specific manufacturer's instructions and local building codes, but as a general rule of thumb, track lighting should have additional support for every four to six feet of track length. This helps prevent sagging and maintains the integrity of the lighting system.
For example, if you have a line of eight feet of track lighting, you would require at least one extra support in the middle. The support can come in various forms, such as ceiling anchors or specialized track support hardware. If we consider the provided examples, it is clear that a line of five feet would be close to needing extra support, while a line of seven feet would require one. Always consult the product's installation guide or a professional for the exact requirements.