How do you calculate total demand when combining continuous and non-continuous loads?

To calculate total demand when combining continuous and non-continuous loads, the approach involves considering the nature of these loads and their contribution to the overall demand. Continuous loads are those that operate for three hours or more at their maximum rating, while non-continuous loads do not run continuously and can be treated differently for calculation purposes.

The correct method involves taking 100% of the continuous loads, as it is essential to account for their full capacity to ensure reliable operation. In addition, it is standard practice to take 125% of the largest non-continuous load. This increase accounts for potential simultaneous operation and demand variations, ensuring that the system is sized appropriately to handle peak loads without risk of overload.

This method balances the need to cater for both types of loads appropriately, reflecting their operational characteristics and ensuring electrical systems are designed to manage potential demand safely.

Other options suggest different combinations or percentages that do not align with the typical methodologies used in load calculations, particularly regarding the treatment of the largest non-continuous load and the continuous load's full capacity.