OSP Aerial Plant & Pole Line Design 3

Question 1

Which gauge of galvanized steel strand is most commonly used as aerial messenger for lightweight telecommunications cables?

Accepted Answer

7 No. 8 EHS (Extra High Strength)

Answer

7 No. 8 EHS (Extra High Strength) galvanized steel strand is the most common messenger for telecom aerial cables, offering the right balance of tensile strength and weight for typical spans.

Question 2

What is the function of a 'bonding wire' installed between the aerial strand and a ground rod at each pole?

Accepted Answer

To provide electrical continuity for the strand and safely dissipate fault currents and lightning

Answer

Bonding the aerial strand to ground rods at each pole provides electrical continuity and a low-impedance path to earth for fault currents and lightning energy, protecting equipment and personnel.

Question 3

When designing aerial plant on a curve, what additional hardware is typically required that would not be needed on a straight run?

Accepted Answer

Corner or angle pole with guy wire

Answer

At curve or angle points, the change in cable direction creates unbalanced horizontal forces that require a corner/angle pole design with guy wire to keep the pole upright.

Question 4

A pole loading calculation must account for which of the following combined forces?

Accepted Answer

Vertical load, horizontal wind load, and tension load from cables and guys

Answer

Pole loading analysis must consider the combined effects of vertical loads (cable and hardware weight), horizontal wind loads, and tension loads from cable pulls and guy wires to ensure the pole can safely withstand all conditions.

Question 5

What is the primary advantage of self-supporting aerial cable (ADSS) over lashed cable on a messenger strand?

Accepted Answer

Eliminates the need for a separate metallic messenger, reducing weight and avoiding galvanic corrosion issues

Answer

ADSS (All-Dielectric Self-Supporting) cable contains its own strength members and requires no metallic messenger strand, eliminating the weight, cost, and corrosion concerns associated with a separate steel messenger.

(OSP) Outside Plant Designer Practice Test

(OSP) Outside Plant Designer Practice Test

OSP Aerial Plant & Pole Line Design 3