Which of the following is NOT a location where a neutralising trap would be necessary?

A neutralising trap is typically designed to treat acidic or caustic wastewater before it is discharged into the sewer system. This is particularly crucial in industries and environments where chemical processes generate hazardous waste.

In scientific laboratories, battery plants, and tanneries, the materials and processes involved often produce acidic or harmful waste that requires neutralisation to prevent damage to the sewer system and to protect public health and the environment. For example, battery plants handle acids used in lead-acid batteries, while tanneries process leathers that can create highly acidic waste.

Conversely, residential homes generally do not produce wastewater that is acidic enough to necessitate a neutralising trap. The waste typically generated in homes, like dishwater, laundry, and human waste, is usually neutral and does not pose the same risk as that created in industrial settings. Thus, a neutralising trap is not required in residential contexts, making it the correct answer.