Where can a Type 1 TVSS installation be connected?

A Type 1 Transient Voltage Surge Suppressor (TVSS) is designed to be installed on the line side of a service disconnect. The purpose of this placement is to provide surge protection at the point where the electrical service enters a building or facility. By connecting the Type 1 TVSS on the line side, it can effectively protect all downstream equipment from voltage spikes, which are often caused by external electrical disturbances, such as lightning strikes or utility switching actions.

This installation method ensures that the TVSS can act on surges before they reach sensitive electrical equipment, thus preventing potential damage. It is crucial for maintaining the integrity of electrical systems and safeguarding operational continuity.

In contrast, installing on the load side of the service disconnect or to the neutral bus bar would not provide the same level of protection for all circuits fed from the service disconnect, as it would only protect equipment downstream of the installation point. Additionally, connecting a TVSS anywhere in the circuit may lead to inadequate protection and does not conform to the recommended practices outlined in the National Electrical Code (NEC) or other relevant standards.