Journeyman Electrician Practice Exam 2026 – The All-In-One Guide to Exam Success!

A Type 2 Surge Protective Device (SPD) is specifically designed to be installed on the load side of the service disconnect. This placement allows the SPD to protect the entire electrical system and connected equipment by intercepting voltage surges coming through the service entrance or generated internally.

By being on the load side, the SPD can effectively route excess voltage away from sensitive equipment and circuits after the service disconnect has been engaged. This location ensures that any surge that passes through the utility service will be addressed before it can reach individual branch circuits, thus offering maximum protection.

Situating the SPD on the load side of the service disconnect adheres to code requirements and best practices to ensure safety and efficacy in surge protection. In contrast, positioning it on the line side or after specific protective devices like the main breaker or fuse may not provide comprehensive protection across all loads connected to the service, thereby potentially leaving some equipment vulnerable to surges.