What should be ensured about communication channels used by signalpersons?

Reliable and uninterrupted communication channels are essential for signalpersons to ensure safety and efficiency during lifting operations. Effective communication allows the signalperson to convey accurate commands to the crane operator and communicate any changes or hazards that may arise during the lift. If the communication channels are not reliable, it can lead to misunderstandings, errors in execution, and potentially hazardous situations. Therefore, establishing communication channels that maintain clear and ongoing interactions is crucial for successful and safe operations in the field.