VDV Study Guide v1.0
additional manual fire boxes shall be so the travel distance to the nearest fire alarm box will not be farther than
200 ft
What is the delay time for ground fault trouble at the main panel?
200 sec
How many feet over the edge shall extension ladder extend?
36" or 3'
A ceiling shall be treated as smooth if the beams project no more than how many inches below the ceiling?
4 inches
After batteries have discharged one full cycle, how many hours do you have to recharge?
48 hours
Unlisted Nonconductive Optical fiber cables are permitted to be installed in a building where the length of the cable does not exceed
50 ft
Where practicable, a seperation of how much distance shall be maintained bewtween communications wires and cables on buildings and lightning conductors?
6 feet
What type of termination for voice application?
66 Block
Where to use bridging clips?
66 block
In communication circuits a bonding jumper shall be used to connect the communicating grounding electrode and power grounding electrode system by a wire not smaller than
6awg (800.100(d))
What best describes signalling line circuit?
A circuit over which multiple input & output signals are carried
For class 2, which portions of abandoned cable shall be removied if not tagged for future use?
Accessible portion
First step on finding resistance using a multi-meter?
Disconnect power (de-energize)
GFCI used for safety on a jobsite can not be
Electrical Cord
Where can you find MSDS? (Material safety data sheet)
Employer
What connector is used for satellite?
F-type
The location of the circuit disconnecting means shall be permanently identified at the
Fire alarm center unit
Cold wind exposed to skin will cause
Frost bite
Purpose of notification appliance device for fire alarm system?
Get building occupants attention
For series circuit involving 240v load and 5ohms resistor, find current
I = E/R = 240V/5ohms = 48 amps
What meter does not detect open or short?
VFL
What statement does not apply to voltage marking?
Voltage marking have to be 1/2" from voltage marking. 820.179(F)
Whatt can be determined by observing the direction of current flow through a circuit?
Voltage polarity
Where the communications cable enters a building, the metallic sheath members of the cable shall be the grounded or interrupted by a
insulating joint [800.93(a)]
Circuit integrity cable is estimated bya minimum fire resistance rating of how many hours?
2 hours
dB is a ratio of
2 quantities
What prevents equipment from cooling down?
DUST
Maximum untwist at connector of CAT 5E
.5 inch (13mm)
Smooth ceilings shall have a detector located within how many times the selected spacing?
0.7 times
How far should you be from powerlines when working on a boom lift
10 ft
how long should a water pipe be burried to be used as a grounding pipe
10 ft
Activation time of alarm notification appliances shall be within how many seconds after actication of an initiating device?
10 seconds
Total sound pressure level with all audible notification appliances operating shall not exceed what DBA at the minimum hearing distance?
110 dBa
What is the minimum size grounding conductor of a community antenna television system?
14 awg
Wall mounted telephone applicance or related firemans phone jack shall be mounted no higher than?
1680mm (66in)
What is the minimum size of a class 3 conductor?
18awg [725.170(h)]
Fire alarm systems shall be provided with at least how many independant& reliable power sources?
2
What is not needed for focal length
Area
In a community antenna television system, what is a permitted substituton for CATVP cable?
BLP
In antenna television system, what is a permitted substitution for CATVP cable?
BLP
Best connector for surveillance systems?
BNC
What type of connector to use for CCTV?
BNC
Which connector for CCTV is used to terminate both sides?
BNC
Dynamic Range means?
Between the loudest & quietest portion of a program in decibels
What system uses a one piece pass through system
Bixby or Bix
What listed cable is used for dwelling?
CATVX
What is the cable marking for Class 3 plenum?
CL3P
Hierarchy of cables
CMP>CMR>CM>CMG>CMX [820.154(B)]
Four components required for a cctv system
Camera, lens, transmission media, and monitor.
What does the acronym for CRT stand for?
Cathode Ray Tube
What info is not on TR plan?
Ceiling info
Which of the following statements is correct regarding the support of communication cables?
Communications cables should not be strapped, taped or attached by any means to the exterior of any conduit or raceway as a means of support.
What was the best method to terminating copper?
Compression
What date do batteries have to have on a booster panel?
Month/Year/Manufacturer
What type of detector is microwave?
Motion sensor
Which type of cable is permitted substitution for OFNP?
NONE
Which type of optical fiber cable is listed as being suitable for use in ducts?
OFNP
What type of plan would you use to troubleshoot?
Point-to-Point
What happens if you put a multimeter across a load on a de-energized parallel circuit?
Reading will be resistance
What hinders the flow of current through a circuit
Resistance
How do you measure cable length?
TDR (Time domain reflectometer)
Backbone cables does not provide interconnection for?
Telecommunication outlets
When you are sound masking, what is white noise used for?
To produce ambient noise
What is the rule for current in parallel circuit?
Total current is equal to the sum of the current through all branches.
Radiant energy detectors shall be categorized as
flame-detector
What is the final step in certification testing?
saving each test
Video signal carry 3 types of signal brightness, color and
synchronization
What is not used for pulling & installing cable?
vacuum
