What is a detonating cord?

A detonating cord is specifically designed as a flexible line that contains a core of high explosives. This cord is used to transmit a detonation signal and effectively detonate other explosives that are connected to it. The cord is often utilized in mining operations, construction, and demolition where controlled blasting is required. The advantage of using a detonating cord is its ability to ensure precise timing and synchronization in explosive detonations, which is critical for safety and efficacy in underground mining operations.

In contrast, the other options do not accurately describe the function or purpose of a detonating cord. It is not used for electrical wiring, nor is it a communication device, and it does not serve as a safety cord for workers. Each of those incorrect choices focuses on a different application that does not align with the specific explosive characteristics and uses of a detonating cord.