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CDMTET
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What order requires CG to maintain safety and occupational health program IAW OSHA for civilians?
Executive order 12196
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What is the base material for a radhaz sign?
.004 in thick white vinyl
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What is the size requirements of radhaz signs for ships?
5in square
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What is the size requirments of radhaz signs for land units?
12 in square
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What is a type 1 radhaz sign?
Warn personnel of PEL
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What is a type 2 radhaz sign?
Restrict personnel unless they comply with radhaz safety procedures.
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What is a type 3 radhaz sign?
Warn personnel of RF burn hazards.
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What is a type 4 radhaz sign?
Warn personnel of HERF
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What is a type 5 radhaz sign?
Below deck to advise operators of specific safety precautions.
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What is a type 6 radhaz sign?
Warn personnel to no operate transmitters, cells, wireless comms
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What is a type 7 radhaz sign?
Warn personnel of HERO
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What is a type 8 radhaz sign?
Advise operators to refer to hero emission control plan before operating transmitters
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Requirement to place CPR sign in all work areas has been established by?
Offices of health services (CG-112)
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What voltage level requires a danger high voltage sign?
500v
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On a ship what can be used to warn personnel in place of a radhaz sign?
4 in wide red painted line
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What is the average exposure time limit for occupational population/controlled exposure?
6 minutes
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what is the average exposure time limit for general population/ uncontrolled exposure?
30 mins
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What is the PEL for DGPS broadcast site?
25 feet
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What is the frequency range for DGPS?
MF
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What is the frequency range for Loran?
LF
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What is the purpose for PEL?
Warn personnel of limits for general population MPE around a broadcasting antenna
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What is the purpose for MPE?
Let personnel know of how long they can work in or near radiation field w/o sustaining injury
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What organs are most susceptible to higher frequency ranges?
Eyes and testes
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What is the startle effect?
A reflexive action from obtaining a shock resulting with further physical harm
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How is a power source defined?
Any power source above 12 vdc
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What type of sign advises operators to familiarize with HERO control plan before operating transmitters?
Type 8
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What equipment should you not use a megger on?
VHF/UHF, waveguide, whip antenna, wire antenna
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What resistance readings for transmission lines/antennas require maintenance?
200Mohms or less, slow degradation over time
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What resistance level requires urgent action to correct transmission line/antenna problem?
5Mohm
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What material are cable tags made out of ?
Soft aluminum
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How do you determine which cable to trace?
Identification of tags on both sides of space
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What does the first letter on the cable tag represent?
Identical system marker
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What does the letter R as the second character on a cable tag represent?
States cable is for electronic equipment
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If the second letter on a cable tag is an A, what does this mean?
Cable is active
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An ES to begin the second set of characters after the hyphen represents what?
Surface search radar
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What is the length and diameter of a typical grounding rod?
10ft by ¾ in
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What should down conductors be made of?
Aluminum, copper, copper clad steel
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The metal framework of an earth electrode subsystem should have a resistance of less the ____ ohms?
10ohms
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What class of bonding is welding?
Class A
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DC resistance across bonding and grounding junctions shall not exceed how many ohms?
.1 ohms
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What size should the grounding cable for lightning protection be?
0000 AWG
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What is advantage to using a floating ground subsystem?
Noise reduction in signal circuits
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A single point ground configuration is recommended for use in what frequency range?
LF, up to 300khz
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What does MCT stand for?
Multi-cable transit
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What are two types of MCT’s?
Nelson firestop and roxtec
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What are two types heliax cables?
Waveguide and coaxial
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Who manufactures heliax products?
Andrews Corporation
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What are two types of stuffing tubes?
Metal and nylon
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When are the Facility ground systems inspected and site surveys conducted?
After major changes to the facility, structure or equipment are made, At least annually inspected.
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What components make up the facility ground system?
Fault protection subsystem, Signal reference ground system, Earth electrode subsystem or shipboard ground plane
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What are the primary functions of a facility ground system?
- 1. Personnel safety
- 2. Equipment and facility protection
- 3. Electrical noise reduction
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What is a Class C bond?
Bridging using a metallic (conductive) strap
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What is a Class A bond?
Joining two metallic surfaces by welding or brazing
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What is a Class B bond?
A bond established by bolting or clamping two metallic surfaces together
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What must the DC resistance be across the bond surface using a Class C bond?
less than 0.1 ohms
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What class of bonding should be used for electrical or electronic systems requiring permanent bonds?
Class A
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What is a type 1 Class C bond?
A corrosion-resistant copper/nickel alloy assembly
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What is a type 2 Class C bond?
Flat CRES 316 with mounting holes in each end
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What is a type 3 Class C bond?
Flat copper with mounting holes in each end
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What is a type 4 Class C bond?
Flat copper braid with mounting holes in each end
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What is a type 5 Class C bond?
TRFX-84 cable with mounting lugs and hardware to suit individual install
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Which fault protection subsystem incorporates grounding conductors (green wires) that are built into the electrical system?
Fault Protection
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Which facility ground subsystem uses a network of interconnecting rods, wires, pipes, or other configurations of metals?
Earth electrode
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What is the minimum length and diameter for a copper-clad steel ground rod for an Earth Electrode Subsystem?
10 feet long and 3/4" inch diameter
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What are examples of lightning protection devices?
Air terminals, Down conductors, Ground rods
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What is the proper bend radius of a down conductor?
No less than 8 inches
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What is the recommended size of a down conductor?
6 AWG copper wire
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The angle of any bend in a down conductor should be no less than how many degrees?
90
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What is the minimum length and diameter for a ground rod used in lightning protection?
8 feet long and 1/2 inch diameter
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RF impedance across bonding and grounding junctions shall not exceed what on a shipboard grounding plane?
25 ohms at 30MHz
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What type and size cable interconnect earth electrode subsystem grounding rods?
1/0 AWG or larger bare copper cable
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At what distance must a structure be in order to require a separate earth electrode subsystem?
20 feet
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What method is used to determine the resistance of the earth electrode subsystem?
Fall of potential method
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Fault protection conductors should be physically separate from signal reference ground conductors except?
Where they connect to the earth electrode subsystem
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What are examples of fault protection devices?
- 1. Fuses
- 2. GFCI's
- 3. Circuit Breaker
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A small deformation at the tip of a lightning rod is an example of what type of lightning effect?
Thermal effect
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Insulation breakdown and component and device failure are an example of what type of lightning effect?
Electrical effect
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Where can you find the basic requirements for personnel protection from a lightning strike to a structure?
NFPA No. 780
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If a building has a pitched roof, then an air terminal should be placed within how many feet of the ends?
2 feet
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On down conductors more than 75 feet, the maximum dc resistance shall not be greater than what?
0.088 ohms per 1000 feet
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How often should a visual inspection be done to the lightning protection subsystem?
Bi-Monthly
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The tip of the air terminal must be a minimum of ___________ inches above the structure?
14
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Metal objects within sex feet of lightning down conductors should be bonded to the down conductors in order to avoid ______________.
Flashover
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What ground configuration is preffered for signal ground subsystems for communications electronics (C-E) facilities?
Multi-point (or equipotential) ground configuration
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Which type of equipotential ground plane must be installed during new construction of a facility?
Concrete floor with embedded copper grids
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In a single-point ground system, how many paths are there for the signal reference to ground?
One
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When inspecting low frequency equipment, what should the resistance be when measuring between the signal ground terminal and the equipment case?
Greater than 1 megohm
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When inspecting fault protection subsystems, what should the resistance be when measuring between the green safety wire and the equipment case?
.1 ohm or less
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Electronic and telecommunications equipment are effectively grounded through _______?
- 1. Capacitive coupling
- 2. Accidental contact
- 3. Intentional connection
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For down conductors less than 75 feet in length what is the maximum dc resistance allowed?
0.176 ohms per 1000 feet
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________ from buried electrodes entering buildings often serve as the principal ground point for connections to equipment ground systems.
Extensions
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For metallic and non-metallic hull ships, all Class ____ extensions to the ship's ground potential shall be designated as the ship's ground plane.
Class A bond
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To reduce the possibility of ___________ effects, cables that terminate electronic devices (such as power, signal, and control lines) should not be run in parallel to down.
Induced voltage
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Due to __________ effects, all elements of the lightning protection subsystem must be securely fastened.
Mechanical
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Field changes are issued by __________.
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Which type of field change furnishes documentation, parts, and special tools required to complete a change.
Type 1
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Which type of field change furnishes documentation only?
Type 2
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Which type of field change furnishes documentation and some of the required parts or special tools?
Type 3
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Which type of field change implements changes to technical documentation only and requires no alteration to the equipment?
Type 4
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What / Who is the authority for the installation of a field change?
Field change bulletin
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