For Class II lightning protection, what types of connections are approved?

For Class II lightning protection, the approved types of connections are specifically crimp type connections, bolted clamps, and exothermic connections. This allows for a variety of reliable and robust connection methods which are essential for effective performance in lightning protection systems.

Crimp connections provide a strong mechanical bond that ensures reliability and continuity of electrical conductivity. Bolted clamps are similarly effective, providing solid connections that can withstand environmental stressors. Exothermic connections, also known as thermite welds, create a very durable bond with low resistance, making them particularly good for grounding applications.

The other options suggest either a limitation on types of approved connections or options that do not meet the necessary standards for Class II systems. Class II standards aim for security in connecting lightning protection components, ensuring safety and functionality. Therefore, having multiple approved methods as indicated reinforces the integrity of the lightning protection system installed.