safety considerations. high voltage high current power supplies can cause burns or start fires even...
TRANSCRIPT
Safety Considerations
High voltage
High currentPOWER SUPPLIES can cause burns or start fires even at low voltages
MAINS VOLTAGE is potentially lethal
Repairs
HIGH POWERED TRANSMITTERS also have lethal voltages inside
BATTERIES can also supply enough current to make wires red hot
Rings and watches must be removed before dealing with high voltages and currentsRepairs should only be undertaken by a suitably qualified technician
quite small currents can kill!
One hand should be kept in a pocket to avoid current passing through the chest
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Mains plugs & earths
A correctly wired plug
THE MAINS EARTH is intended to protect you under fault conditions
You are not expected to be able fit a plug until
Switch off the mains supply before touchingAccidents & Emergencies
reproduced from the RSGB publication 'Foundation Licence Now!'
A FUSE of the right rating fitted in a plug is a vital part of the protection system.PROTECTIVE MULTIPLE EARTHING (PME)
to recognise when it is safely fitted with thecorrectly rated fuse installed.
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shock and could still be touching a live wire!they may have suffered an electric
the Intermediate exam. It is useful to be able
The casualty!
Antennas & feeders
even if they are insulated!
FEEDERS must be:
ANTENNAS must be:
Routed to avoid being trip hazards
Fixed securely enough to survive gale force wind conditionsLocated where they can't be reached and won't be walked into
Out of reach if unscreened to avoid RF BURNS
Far enough away to avoid contact with overhead power lines
WORKING AT HEIGHTSErecting antennas must never be attempted alone
Hard hats should be worn by people on the ground
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At least one adult should be in attendance preferably twoOne person should “foot” the ladder to prevent it slipping
from the RSGB publication 'Amateur Radio Exam Secrets'
The ladder should be placed at the correct angle
from the RSGB publication 'Intermediate Licence Building on the Foundation'
from the RSGB publication 'Intermediate Licence Building on the Foundation'
from the RSGB publication 'Intermediate Licence Building on the Foundation'
Never lean out when on a ladder!
4:1
Car batteriesAre designed to supply very high currents sufficient to melt heavy gauge wires!Charging them causes the release of hydrogen
which can be explosive in an enclosed space!They also contain a very corrosive acid
spills and splashes can cause serious injury and damage!
HeadphonesWearing headphones carries risk:
Long periods of high listening levels can in time result in permanent hearing loss When servicing equipment could lead to electric shockIf you walk away with them on equipment could be dragged off the work surface
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Consider using the safer sealed batteries instead
Other hazardsThe shack can contain a number of other potential risks:Tools often have very sharp edges causing cuts
Cables trailing onto and across the floor are trip hazards
from the RSGB publication “Foundation Licence Now!”
Soldering irons get very hot and can cause severe burnsMost tools can cause injury when used incorrectly
Cables running under carpets can become fire hazards
Remember - most hazards can be avoided by thinking and planning ahead
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Revision questions
from the RSGB publication “Foundation Licence Now!”
What colour is the neutral wire in a mains pluggreen/yellow, blue or brown?
What's wrong here?
Why must unscreened feeder be out of reach?RF burns are possible even if wires are insulated.
The person footing the ladder could be in danger of serious head injury if something is dropped from the top of the ladder. Hard hat is essential!
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from the RSGB publication 'Amateur Radio Exam Secrets'