How to Connect Earth to SPD for Homes | Earthing Guide for Surge Protection Device | No Separate Earth For SPD
In this article, we discuss briefly How to Connect Earth to SPD and where to place SPD at your home. this complete article is based on Earthing Guide for Surge Protection Devices by Eaton. The limiting voltage can be lowered by re-positioning the earth connection. Locating the equipment earth (i.e. its zero-volt reference) at the SPD earth point produces the configuration shown in figure 19. Placing Type 1 & 2 SPD in energy meter box where power cable enters the house and at the same place is the nearest point to earth pit.
The equipment is now subjected to an inductive voltage transient across the earth cable. There is still a large transient voltage developing between the ground point and the SPD, but this does not appear across the equipment which receives only the limiting voltage of the SPD – which is as it should be.