Which of the following is a requirement when mechanically securing splices?

When mechanically securing splices, ensuring that they are made electrically secure is a fundamental requirement. This is crucial because an electrically secure splice will maintain continuous electrical conductivity, preventing power loss and avoiding potential hazards such as overheating or fire risks due to poor connections. An electrically secure connection minimizes resistance at the splice point, which could otherwise lead to instability in the electrical system.

Additionally, while other considerations such as corrosion resistance and enclosure might be important in specific contexts (like environmental conditions), the primary focus for splicing in terms of immediate safety and functionality lies in ensuring that the electrical integrity is uncompromised. This is why the requirement for splices to be made electrically secure takes precedence.