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The network service wire is secured to the messenger at the pole by a span clamp. The span clamp is
attached a minimum of 10 cm (4") from the span side of the aerial terminal and 38 cm (15") from the pole on
the opposite side of the pole. Bridal rings will be used at the pole.
Drive hooks will only be used where proper road clearance cannot be met using a span clamp
Customers can either be on the field side or the road side of the messenger.
If the proper method is not followed to place the drop, it will get twisted into the messenger and cable when
construction crews “over spin” the cable. If this happens, the construction crews will be forced to cut the
drop.
Network service wire from a span clamp going to a building on the field side must be attached as shown here
in the top diagram.
Network service wire from a span clamp going to a building on the road side must be attached as shown in
the bottom diagram. This is achieved by looping the network service wire over the cable before attaching
network service wire to a backward facing span clamp.
Drop Placing Caution
Care must be taken when placing drops, particularly over or across roads. If a potential traffic hazard exists,
discuss traffic control options with your manager.
Never attach a drop to your body or equipment. Use a break-away clip or better still a hand line to raise a
drop.
Always attach and sag the drop to the messenger or drive hook before doing any other work aloft.
Always perform voltage hazard tests when working aloft and before ascending the pole.
Drive Hooks
Figure 57: Drive Hooks
The only time a pole is contacted with the network service wire is when additional height is required for road
clearance or no messenger exists on which to attach a span clamp. Use drive hooks to contact pole.
1.7.2 Aerial drop routing
