General requirements

15272 Pole Accessories

152721 Insulators

Porcelain insulators (Pin Type Insulators) type N80 and N95 with arrangement for pin and hook tips to be fixed with plaster of Paris shall be used. N80 is to be used for small size conductors and N95 with conductors larger than 25sq.mm. Porcelain glazed insulators (Shackle Insulators) Type Y-9732 with shaft hole diameter of about 18-25mm with major lobes about 60-100mm in diameter are to be used at dead end; at T-junction and at bent poles.

Hot drip galvanized steel sawn rock hooks are to be screwed into wooden poles for insulations of N80 and N95.
Hot drip galvanized pins shall be used with steel cross arms for insulators N80 and N95.

Guy or stay insulators of glazed porcelain are to be used to break the continuity of galvanized steel wires used for guying. Guy insulators are to be placed at heights of about 3-5m above the ground depending on the length of the pole used.

For shackle insulators D-iron with bolt and nut constitutes the hardware part. The D-iron is a rectangular hot dip galvanized steel at least 38x6mm in cross-section. The assembly is used for dead-ending low tension line.

152722 Cross arms of types specified in the Bill as per EELPA specification shall be produced from various sizes of steel channels. Cross arms shall include fixing collars, bolts and nuts with holes for insulator pins.

152723 Aerial fuses with porcelain type fuse holder and section switch with rating as specified in the Bill shall be mounted on poles.