Which of the following cables is NOT suitable for 3 -phase equipment? \( 1 \times 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC}+35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \) \( 2 \times 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC}+35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \) \( 4 \times 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC}+35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \) \( 1 \times 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{XLPE} / \mathrm{PVC}+50 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \)

The cable **\( 2 \times 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC}+35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \)** is **NOT suitable** for 3-phase equipment. ### Explanation: For 3-phase equipment, you typically require three phase conductors along with a neutral or protective conductor (CPC). Let's evaluate each option: 1. **\( 1 \times 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \)** - **Suitable:** Contains four conductors, which can accommodate three phases plus a CPC. 2. **\( 2 \times 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \)** - **Not Suitable:** Only provides two phase conductors, which is insufficient for a three-phase system that requires three separate phase conductors. 3. **\( 4 \times 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} \)** - **Suitable:** Offers four individual conductors, suitable for three phases plus a CPC. 4. **\( 1 \times 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{XLPE} / \mathrm{PVC} + 50 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \)** - **Suitable:** Similar to the first option but with different insulation, still accommodating the necessary conductors for a three-phase setup. Therefore, the second option does not provide the necessary number of phase conductors for a three-phase system, making it unsuitable. **Answer:** The second cable option with 2 × 1 C 70 mm² Cu/PVC plus 35 mm² Cu/PVC CPC is not suitable.