15-25. Poles which have to be stored for more than two (2) weeks shall be stacked in close piles upon treated or other non-decaying skids. The skids shall be of such strength and dimensions properly spaced so as to support the poles without producing noticeable distortion of any of them. CONDUCTORS: 15-26, Fer overhead distribution, unless otherwise approved, bare copper conductors shall be used for primary service, copper conductors with weatherproof covering shail be used for secondary service. 15-27. Taps shall be made with solderless connectors. 15-28. When facing the direction the power is coming from 15-29, Secondary lines on service racks shall be identi- the primary conductors from right to left will be Phase A, Phase B and Phase C. fied as follows: Top wire, neutral, second wire phase "A", third wire phase "B", bottom wire phase "C" 15-30. The following sag tables are intended as a guidance for installation in a tropical climate of hard and medium hard drawn bare copper for different span lengths: Wire stringing Span in Size AWG Temp. Deg. F. Feet 125 rT 90 60 0 0 15-31. span in Span Feet 175 Feet 200 13 9 18 13 24 18 28 18 9 13 18 18 90 13 90 60 13 9 60 Span in Feet 150 sag in Inches 18 18 13 a4 ek 18 23.5 23.5 18 For required clearance and minimum separation of conductors, see regulations referred to in paragraph 15-03. 15-32. UNDERGROUND PRIMARY CABLE shall be suitable for direct burial in wet or dry coral aggregate. Cable shall be installed in conduit at entry to buildings or structures or other points indicated on the drawings. 15-5