B-003-19: Electrical safety ground, capacitor discharge, fuse replacement
B-003-19-01:
For best protection from electrical shock, what should be grounded in an amateur station?
All station equipment
The antenna feed line
The AC power line
The power supply primary
B-003-19-02:
If a separate ground system is not possible for your amateur station, an alternative indoor grounding point could be:
a metallic cold water pipe
a plastic cold water pipe
a window screen
a metallic natural gas pipe
B-003-19-03:
To protect you against electrical shock, the chassis of each piece of your station equipment should be connected to:
a good ground connection
a dummy load
insulated shock mounts
the antenna
B-003-19-04:
Which of these materials is best for a ground rod driven into the earth?
Copper-clad steel
Hard plastic
Iron or steel
Fiberglass
B-003-19-06:
Where should the green wire in a three-wire AC line cord be connected in a power supply?
To the chassis
To the white wire
To the "hot" side of the power switch
To the fuse
B-003-19-07:
If your third-floor amateur station has a ground wire running 10.05 metres (33 feet) down to a ground rod, why might you get an RF burn if you touch the front panel of your HF transceiver?
Because the ground wire is a resonant length on several HF bands and acts more like an antenna than an RF ground connection
Because of a bad antenna connection, allowing the RF energy to take an easier path out of the transceiver through you
Because the transceiver's heat-sensing circuit is not working to start the cooling fan
Because the ground rod is not making good contact with moist earth
B-003-19-08:
What is one good way to avoid stray RF energy in your amateur station?
Keep the station's ground wire as short as possible
Make a couple of loops in the ground wire where it connects to your station
Drive the ground rod at least 420 cm (14 feet) into the ground
Use a beryllium ground wire for best conductivity
B-003-19-09:
Which statement about station grounding is true?
RF hot spots can occur in a station located above the ground floor if the equipment is grounded by a long ground wire
A ground loop is an effective way to ground station equipment
If the chassis of all station equipment is connected with a good conductor, there is no need to tie them to an earth ground
The chassis of each piece of station equipment should be tied together with high-impedance conductors
B-003-19-10:
On mains operated power supplies, the ground wire should be connected to the metal chassis of the power supply. This ensures, in case there is a fault in the power supply, that the chassis:
does not develop a high voltage with respect to the ground
does not become conductive to prevent electric shock
becomes conductive to prevent electric shock
develops a high voltage compared to the ground
B-003-19-11:
The purpose of using a three-wire power cord and plug on amateur radio equipment is to:
prevent the chassis from becoming live in case of an internal short to the chassis
prevent the plug from being reversed in the wall outlet
prevent short circuits
make it inconvenient to use
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