Should cable limiters and other current limiting devices be connected to the supply side of a service disconnect?

Connecting cable limiters and other current limiting devices to the supply side of a service disconnect is generally incorrect practice. Current limiting devices are designed to protect the electrical system and equipment from overcurrent conditions. They should be installed in a manner that allows them to effectively monitor and control the current flowing within the system.

When these devices are connected on the supply side of the service disconnect, they can potentially operate outside their intended range or expose the entire system to unprotected conditions during maintenance or service interruptions. The proper approach is to position them on the load side of the disconnect. This placement ensures that they only engage when the service is in operation, providing protection to downstream circuits and devices while allowing for safe servicing of the equipment without risking unwanted tripping or disruptions in service.

While there might be scenarios where certain equipment may allow for specific configurations, general practice and safety standards dictate that these devices should be kept on the load side of the service disconnect. This ensures optimal function and reliability of the safety mechanisms put in place to guard against overcurrent situations.