What is typically used to ensure physical protection for electrical connections in outdoor tests?

Sealed enclosures are typically used to ensure physical protection for electrical connections in outdoor tests. These enclosures provide a robust barrier against environmental elements such as moisture, dust, and extreme temperatures, which can contribute to corrosion and electrical failure. Sealed enclosures are designed to be weather-resistant and can protect sensitive electrical components from physical damage and disruption of service, ensuring reliable operation in outdoor settings.

The other options, while they may provide some level of protection, do not offer the same comprehensive safeguarding that sealed enclosures do. For example, plastic wrap might offer minimal barrier protection but lacks durability and effectiveness against harsh weather conditions. Sandbags may be used for stability or weight but do not protect electrical connections directly. Insulated tape can provide some level of insulation and moisture protection, but it is not designed for long-term physical protection of electrical connections, particularly in outdoor environments. Therefore, sealed enclosures are the most suitable choice for this purpose.