All measuring and test instruments used for testing of the lightning protection system installations shall be regularly tested and calibrated by the
manufacturers or test and calibration laboratories for their functionality and accuracy. Basic measurement accuracy for these instruments shall be within 5 %. In the case of analogue instruments, a basis accuracy of 2 % of full scale deflection shall be provided. Test and Calibration Reports or Certificates for the measuring and test instruments issued by the test and calibration laboratory shall be valid for two years from the date of issuance. The instruments and their Test and Calibration Reports or Certificates shall be submitted to S.O.’s Representative for verification two weeks before testing of the electrical installation being carried out. No test on the electrical installation shall be carried out without prior approval of the S.O.’s Representative.

Notwithstanding the validity of the aforesaid Reports or Certificates the measuring and test instruments shall be re-calibrated if so required by the S.O.’s Representative after any mechanical or electrical mishandling. Fee required for the testing and calibrating of the measuring and test instruments is deemed to be included in the Contract.


After the installation work has been completed and before Certificate of Practical Completion is issued, the whole lightning protection system
electrical installation covered under this part of the Contract shall be tested in accordance with BS 6651 and any other tests deem necessary by the
S.O.’s Representative. In the event the installation fails to pass any of these tests, the Electrical Contractor shall take such measures as are necessary to remedy the defects and the installation shall not be considered as completed until all such tests have been passed.

The tests to be carried out by the Electrical Contractor shall consist of the following tests as a minimum requirement: –

(a) Continuity of air termination network.
(b) Continuity of air termination network and the down conductors.
(c) Continuity of the down conductor and earth termination.
(d) Continuity of earth termination network.
(e) Continuity of earth termination and the main earthing bar for the electrical installation
(f) Earth electrode resistance.
(g) Earth termination resistance.

Fee required for the tests as described above is deemed to be included in the Contract.

The S.O.’s Representative reserves the right to be present at all tests and the Electrical Contractor shall give at least one-week notice in writing to the S.O.’s Representative for this purpose. In any case, no test shall be carried out without prior approval of the S.O.’s Representative. Copies of all the test certificates together with as-installed Drawings properly bound and titled shall be submitted to the S.O.’s Representative within one week after the completion of the testing.

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