Copper cable telecommunications plant measurements.

CFR · 2024-01-01 · US · Title 7

(a) (2) Measurement techniques outlined here for verification of shield or shield/armor continuity are applicable to buried cable plant. Measurements of shield continuity between splices in aerial cable plant should be made prior to completion of splicing. Conclusive results cannot be obtained on aerial plant after all bonds have been completed to the supporting strand, multigrounded neutral, etc. (3) (ii) Cable shield or shield/armor continuity within pedestals or splices shall be measured with a cable shield splice continuity test set. The step-by-step measurement procedure outlined in the manufacturer's operating instructions for the specific test equipment being used shall be followed. (4) (ii) A cable shield splice continuity tester shall be used to measure shield or shield/armor continuity within pedestals or splices. (5) (ii) All values of shield and shield/armor resistance provided in Tables 1 and 2 in (a)(5)(i) of this section are considered approximations. If the measured value corrected to 68 °F (20 °C) is within #30 percent (%) of the value shown in Table 1 or 2, the shield and shield/armor shall be assumed to be continuous. (iii) To correct the measured shield resistance to the reference temperature of 68 °F (20 °C) use the following formulae: (iv) The temperature coefficients (A) for the shield tapes to be used in the formulae referenced in paragraph (a)(5)(iii) of this section are as follows: (A) 5 and 10 mil copper = 0.0021 for English units and 0.0039 for Met

official document · source cfr-2024 · id 7:§ 1755.403