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– Earth resistance or loop resistance at the individual test A maintenance routine should be prepared. This allows a com-
joints with information on the measuring method and parison between the latest results and those from an earlier
the type of measuring device maintenance. These values can also be used for comparison for
– Total earth resistance (measurement with or without a later inspection.
protective conductor and metal building installation)
¨ Inspector: Name of the inspector, inspector´s company / The following measures should be included in a maintenance
organisation, name of person accompanying the inspector, routine:
number of pages of the report, date of inspection, signature ¨ Inspection of all conductors and components of the light-
of the inspector´s company / organisation ning protection system

¨ Measuring the continuity of the installations of the light-
Sample test reports according to the requirements of Supple-
ment 3 of the German DIN EN 62305-3 standard are available ning protection system
at www.dehn-international.com. ¨ Measuring the earth resistance of the earth-termination
¨ For general installations: Test report No. 2110 system
¨ For installations located in hazardous areas: Test report ¨ Visual inspection of all surge protective devices (relates to
No. 2117 surge protective devices installed on the incoming lines of
the power installation and information system) to detect
whether they are damaged or have tripped
3.3.4 Maintenance ¨ Fixing components and conductors again
Maintenance and inspection of lightning protection systems ¨ Inspection to ascertain that the effectiveness of the light-
must be coordinated. In addition to the inspections, regular ning protection system is unchanged after additional in-
maintenance routines should therefore also be defined for all stallations or modifications to the structure
lightning protection systems. The frequency of maintenance
work depends on the following factors: Complete records should be kept of all maintenance work.
¨ Loss of quality related to the weather and ambient condi- They should contain modification measures which have been
tions or must be carried out.
¨ Effects of direct lightning strikes and resulting possible These records make it easier to assess the components and
damage installations of the lightning protection system. They can be
¨ Class of LPS required for the structure under consideration used to examine and update a maintenance routine. The main-
Maintenance measures should be individually determined for tenance records should be retained together with the design
each lightning protection system and become an integral part and the inspection reports of the lightning protection system
of the complete maintenance programme for the structure. for future reference.

58 LIGHTNING PROTECTION GUIDE www.dehn-international.com