A single core cable (used as part of a final circuit) only has a layer of PVC insulation around its copper core. It has no sheath. Which of the followinmg statement is TRUE? The cable cannot be used for circuits supplying SSOs. The cable has a very high current carrying capacity. The cable has to be run in a cable trunking or conduit. The cable can only be used in lighting circuits.

The correct statement is: **The cable has to be run in a cable trunking or conduit.** **Explanation:** A single core cable without a sheath, having only a layer of PVC insulation around its copper core, lacks the external protection that sheath provides. To ensure safety and compliance with electrical regulations, such cables must be protected from physical damage and environmental factors. Running them inside a cable trunking or conduit provides the necessary protection. This makes Option 3 the true statement. - **Option 1:** Single core cables without sheath are generally not recommended for circuits supplying socket outlets (SSOs) because they lack the necessary protection, but saying they "cannot" be used is too absolute and not entirely accurate if proper protection measures like conduits are in place. - **Option 2:** Without a sheath, single core cables typically do not have a very high current-carrying capacity compared to other types like multi-core or sheathed cables. - **Option 4:** The restriction to lighting circuits is not accurate. While single core cables may be more commonly used in lighting, they are not exclusively limited to that application provided they are adequately protected. **Answer:** The cable must be installed within trunking or conduit; it has to be run in a cable trunking or conduit.