Are "S" loops allowed for ground movement where service lateral conductors emerge from an underground raceway adjacent to a pad-mounted transformer?

"S" loops are indeed allowed for ground movement where service lateral conductors emerge from an underground raceway adjacent to a pad-mounted transformer. The purpose of allowing "S" loops in this instance is to provide flexibility and accommodate ground movement, which is essential for reducing stress on the conductors due to soil movement, thermal expansion, and contraction.

When service lateral conductors exit an underground raceway near a transformer, they may experience various physical stresses due to environmental conditions. An "S" loop allows for a more effective strain relief mechanism, preventing damage to the conductors and connections. This design approach helps maintain the integrity of the electrical connections and ensures a reliable power supply to the transformer.

The presence of an "S" loop also improves the overall system's resilience to ground movement, which is vital in areas susceptible to seismic activity or other environmental factors that could cause shifts in the ground. By utilizing this design, electrical contractors can adhere to best practices in installation, ensuring safety, durability, and performance of the electrical system.