This step-by-step guide shows you how to use a power distribution terminal block for a secure connection every time. Before you connect anything, you need to. Connecting power to a junction box may seem like a simple task, but it's crucial to make sure it's connected correctly to avoid any electrical hazards or system failure. Mistakes can result in system failure, dangerous electrical failures and costly downtime, and knowing the correct steps and. This guide serves as an authoritative resource, engineered to clarify the process of connecting a power supply to a terminal block. Installing a new electric motor requires careful consideration of the power supply voltage.