4. Earthing & Bonding for Protection · Page 5 of 6
External LPS Meets Internal SPDs
How air terminals and down conductors interact with power SPDs.
Separation distance
External LPS conductors can induce voltages on nearby cables. Maintain separation or bonding as required by IEC 62305 practice and local codes.
Service entrance bond
Where the LPS and electrical earthing meet, Type 1 SPDs often become necessary to equalize potential between power conductors and the LPS earth.
One system, two teams
Roof LPS installers and electrical panel builders must share drawings. Split responsibility is a common root cause of incomplete protection.