If encountering a fourth conductor, how many intersystem bonding conductors can be connected at a termination device?

In the context of grounding and bonding systems, a termination device has specific allowances regarding the number of intersystem bonding conductors that can be connected. When dealing with a fourth conductor, it is established that a maximum of three intersystem bonding conductors can be attached at a termination device. This limitation is designed to ensure the integrity and safety of the grounding system by preventing overcrowding, which could lead to issues such as increased resistance or the potential for electrical faults.

A clear understanding of the regulatory framework, such as the National Electrical Code (NEC), supports the decision to limit intersystem bonding conductors to three, helping to maintain effective electrical performance and safety. This rule ensures that bond junctions remain accessible for maintenance and minimize complications during electrical events.

The other options suggest either fewer than three conductors or no limits. However, adhering to the maximum of three conductors at a termination device strikes a balance between sufficient bonding while ensuring system reliability and safety standards are upheld.