GB 50057-2010 第6.3.4条
| Local equipotential bonding terminal boxes (LEB) shall be installed in hotel bathrooms (especially shower and bathtub areas), connecting all metal objects in the bathroom (such as metal water supply and drainage pipes, metal floor drains, metal grab bars, metal towel racks, and metal bathtub components) and socket PE conductors to the LEB. Connection conductor cross-sectional area: copper not less than 4 mm², steel not less than 16 mm².