While the provided documents do not specifically mention 'trench shoring water taps,' they do offer crucial information regarding trench safety and protective systems. Here's a synthesis of relevant points:

1. Protective Systems: When workers are in a trench deeper than 1.2 meters, employers must ensure protection from cave-ins using methods like sloping the walls, installing temporary protective structures (shoring), or a combination of both [1].
2. Shoring: Shoring systems must be designed and installed to prevent cave-ins and structural collapses [1]. Components should be securely connected to prevent failure, and individual components must not be overloaded [1].
3. Competent Person: If a worker is in a trench deeper than 1.2 meters, a competent person must be stationed on the surface to watch for unsafe conditions and provide emergency assistance [1].
4. Water Accumulation: Employees should not work in excavations with accumulated water unless adequate precautions have been taken [2]. These precautions may include special support or shield systems, water removal, or safety harnesses and lifelines [2].
5. Temporary Protective Structures: These structures must be designed, constructed, installed, used, maintained, and dismantled to provide adequate worker protection [3]. They should also extend at least 300mm above the excavation wall to prevent material from falling in [3].
6. Professional Engineer: Trenches deeper than 3 meters may require a temporary protective structure designed and certified by a professional engineer 1, 11.
7. Access and Egress: Employers must install ladders, stairways, or ramps for safe entry and exit, located within 8 meters of any worker in the trench [4].

Given the above information, if 'trench shoring water taps' refers to a system for water removal or control within the shoring structure, ensure the system is monitored by a competent person [2] and does not compromise the integrity of the protective system. If the water taps are part of a dewatering system, ensure it is functioning properly to prevent water accumulation, which could lead to cave-ins [2].