The formula to calculate the design power is:

\[ DP = \frac{P_t \cdot S}{MSF} \]

Where:

• \(DP\) is the design power in Watts.
• \(P_t\) is the power to be transmitted in Watts.
• \(S\) is the service factor, ranging from 1.0 to 1.7.
• \(MSF\) is the multiple strand factor, ranging from 1.7 to 3.3.