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

Question

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

UpStudy AI · Accepted Answer

The cable **$$ 2 	imes 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC}+35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} $$** 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. **$$ 1 	imes 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} $$**  
   - **Suitable:** Contains four conductors, which can accommodate three phases plus a CPC.

2. **$$ 2 	imes 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} $$**  
   - **Not Suitable:** Only provides two phase conductors, which is insufficient for a three-phase system that requires three separate phase conductors.

3. **$$ 4 	imes 1 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} + 35 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} \mathrm{CPC} $$**  
   - **Suitable:** Offers four individual conductors, suitable for three phases plus a CPC.

4. **$$ 1 	imes 4 \mathrm{C} 70 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{XLPE} / \mathrm{PVC} + 50 \mathrm{~mm}^{2} \mathrm{Cu} / \mathrm{PVC} $$**  
   - **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.
The second cable option is not suitable for 3-phase equipment.

Which of the following cables is NOT suitable for 3 -phase equipment?

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