Utilities are obligated to provide voltage at the meter in an acceptable range to ensure equipment runs efficiently and is not damaged. If the service voltage is intended to be 120 volts, the meter would have to measure between _____ and ______.
Construction of underground systems is approximately _______ times more expensive per mile than overhead construction.
Distribuition lines are almost always installed underground in residential subdivision jointly with other ______.
Utilities may choose to install underground distribution lines in areas where ________ is commonly encountered.
Name the parts of a snatch block.
Snatch blocks can reduce ________ in some rigging configurations.
Haul line tension
Snatch blocks are commonly used when performing work on ________.
When inspecting the hook and safety latch of a snatch block, what are you looking for?
defective safety latch
excessive wear at contact points
Where is the weight rating found on snatch blocks?
Stamped or cast on the hook or shell, or in some cases a tag riveted to the shell.
When inspecting the locking pin, pivot pin, and swivel of a snatch block, what are you looking for?
Swivel operates freely
Lubricate if recommended
When inspecting the shell of a snatch block, what are you looking for?
Sharp edges that could damage the rope
When inspecting the center pin of a snatch block, what are you looking for?
Tightly seated and secure.
When inspecting the sheave of a snatch block, what are you looking for?
Sheave turns freely
Excessive wear of bearing
Sharp edges that could damage the rope
If you cannot find the weight rating on a snatch block you should ___________.
remove it from service
The tension on a snatch block is dependent on the _______ the rope is passing through.
When a rope passes through a block, there is a _____ and a ______.
As a rope passes through a snatch block, the end that is connected to the object being lifted is called the ___________.
What is the formula for calculating snatch block tension?
line out X angle factor
If your snatch block becomes soiled you should ________.
Rinse it thoroughly and lubricate the sheave bearing per the manufacturers recommendations.
What is the unique feature of a snatch block?
It can open near the swivel to trap the bight or middle of the rope.
The tension applied to the snatch block determines the size of the _____, ______, and _______.
Knowing the tensions involved with the snatch block will:
Ensure a safe working environment
Prevent damage to the equipment
The strong points of transmission structures where snatch blocks should be placed are:
The point where the structure meets the ground
The top of the structure
The point where the insulator is connected to the structure
Where a horizontal member meets a vertical member
Failure to place a block at a strong point when lifting heavy conductors could jeopardize the:
Safety of the crew
Stability of the structure
What is the formula for calculating line out tension after passing through a snatch block?
Line in X friction (1.1)
The distribution system is different from the transmission system because the direct delivery of power is more _________.
What five items impact the reliability of a distribution system?
Size and type of structures
Size and type of conductors
Route of the power line
Location of protective equipment
Overhead or underground system
What is the primary use of a snatch block?
To redirect the pulling forces applied to a haul line, rope, or a moving load.
A tap in the middle of a line where there is no pole present is called a ______.
Where does the main line radiate from?
A grounded WYE has a neutral line or __________ line.
What voltage range is considered "low voltage" in the distribution system?
0 - 600 volts
Name the four types of customers in the distribution system.
What two types of customers make up the bulk of a utilitie's customer base?
What is the primary objective of the Distribution system?
To deliver power to the customer with a minimum amount of loss.
The main lines and the tap lines are both part of one _________.
What is the formula for calculating Line Voltage when given a system voltage?
System voltage divided by 1.732
What is the formula for calculating System voltage when given a line voltage?