Download Siemens TPS3 15 Specifications

Sub-feed Lugs
Sub-feed lugs are mounted directly beside the main incoming
lugs on a panelboard and are used to connect one or more
additional panelboards to the same feeder. In the example
shown below, two adjacent main lug only panelboards are
connected to the feeder through a fusible switch or circuit
breaker. Power supplied by the overcurrent protection device is
routed to the panelboard on the left and through sub-feed lugs
to the panelboard on the right.
Circuit Breaker
Fused Disconnect Switch
Sub-feed Lugs from Left Panel
Connect to Main Lugs on Right Panel