Final answer:
The statement about Class 2 circuits conductors needing to be separated by at least 50 mm from other conductors is false. High-voltage power lines are not insulated but held aloft and separated by air for insulation. Plastic insulation on live/hot wires prevents both shock and thermal hazards.
Step-by-step explanation:
Conductors of Class 2 circuits must be separated by at least 50 mm from insulated conductors of non-metallic sheathed cable supplying electric lighting, power, or Class 1 circuits operating at 300 V or less. This statement is false. The National Electrical Code (NEC) specifies the separation requirements for different types of conductors to ensure electrical safety and avoid potential interference.
Regarding the other examples provided, high-voltage power lines are indeed held aloft by insulating connectors. However, these wires are not wrapped in insulating material; they are bare, relying on the surrounding air and their height above ground for insulation, which makes the statement false.
In the calculation of magnetic force between two parallel conductors, the current, separation distance, and length of wires all play a role in determining the magnitude and direction of the force. Such forces can have practical consequences, like exerting stress on the wires or supporting structures, potentially leading to mechanical failure if not properly managed.
Plastic insulation on live/hot wires is designed to help prevent both shock and thermal hazards by providing a non-conductive barrier between electrical conductors and people or objects that might come into contact with them.