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

6M (6-messenger)

Answer

7 No. 10 strand

Answer

4/0 AWG copper-clad

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

To reduce electromagnetic interference on the cable

Answer

To test the continuity of the messenger strand

Answer

To mechanically anchor the strand to the pole

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

Cable pressure plugs

Answer

Fiber optical splice closures

Answer

Underground transition conduit

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

Cable weight only

Answer

Wind pressure only

Answer

Temperature and UV degradation factors

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

Lower cost per foot of cable

Answer

Higher fiber count capacity

Answer

Easier to splice in the field

Question 6

In the context of aerial OSP, what is a 'service drop'?

Accepted Answer

The vertical section of cable from an aerial run down to a customer's premises

Answer

A reduction in cable grade at the end of a route

Answer

A temporary cable installation pending underground burial

Answer

A cable section that has failed and needs replacement

Question 7

What is the recommended practice when a new telecommunications cable must cross above an existing power line on a different pole route?

Accepted Answer

Design the crossing so the telecom cable passes beneath the power line at the required NESC clearance

Answer

The telecom cable automatically has right-of-way over power lines

Answer

Only underground crossing is permitted where power lines exist

Answer

Telecom cables may not cross active power lines under any circumstances