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Chelmsford Amateur Radio Society Intermediate Course (9) Safety. Remember the Foundation Slides. Soldering - Safety Issues (Part 1). The soldering iron stand is a safe place to keep the iron when hot. This minimises risk of skin contact and burns.

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Chelmsford Amateur Radio Society Intermediate Course (9) Safety

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soldering safety issues part 1
Soldering - Safety Issues(Part 1)
  • The soldering iron stand is a safe place to keep the iron when hot.
  • This minimises risk of skin contact and burns.
  • It often also prevents the iron overheating when not in use.
soldering safety issues part 2
Soldering - Safety Issues(Part 2)
  • The fumes from soldering, usually the heated flux, can cause respiratory problems, especially for asthmatics.
  • The work bench must be kept well ventilated to minimise the inhalation of the fumes.
soldering safety issues part 3
Soldering - Safety Issues(Part 3)
  • Goggles or suitable glasses should be worn when soldering to prevent solder splashed and spitting flux causing eye damage.
  • Note: This will also be mandatory on this course.
workshop safety general part 1
Workshop Safety - General(Part 1)
  • Use tools carefully.
  • Clear tidy work place.
  • Work away from the hands or body in case of slips.
  • Items being worked on, must be securely held to prevent it moving when being drilled, sawn or filed.
workshop safety drilling part 2
Workshop Safety - Drilling(Part 2)
  • A chuck key left in the chuck can cause serious injury to self or others in the room or nearby.
  • Before drilling a hole use a centre punch.
  • This has a safety implication as well as aiding neat workmanship.
  • Any activity, especially drilling, can throw up swarf. This can cause cuts and eye damage.
  • Suitable precautions such as Goggles or suitable glasses should be worn.
ladders safety

4 Metres

1 Metre

Ladders - Safety
  • Take care when erecting ladders etc.
  • The correct angle can be expressed as a 1:4 ratio
  • Ladder should be suitably secured at the top or held at the bottom by an adult.
  • Over-reaching can cause a fall or cause the ladder to slip, rotate.
  • Use a tool belt to carry tools this will help prevent falling objects.
  • Wear hard hats when working at height or when others are working at height.
antenna installation safety
Antenna Installation Safety
  • Electric shock can result from Antennas and Ladders coming into contact with, or arcing from overhead power lines.
  • Even wooden ladders are dangerous in this context.
  • A wet wooden ladder will conduct electricity.
  • Antennas and feeders must be kept well clear.
  • Feeders / antennas must be soundly fixed in case of being accidentally being pulled by high winds, tree branches, icing, birds etc
safety earthing foundation
Safety Earthing (Foundation)
  • Ensure shack equipment is run from a common mains earth to prevent earth loops - use filtered mains boards and ferrite rings correctly.
  • Modern Gas & Water Pipes can give high resistance earth.
  • Beware of House earths above earth potential
  • Do not mix Mains Earth (for safety) with RF Earths (for Antennas)
mains cables
Mains Cables
  • Avoid trailing mains leads on the shack floor - Trip Hazards!
  • Same as for Foundation . . .
    • Avoid Damage to Self.
    • Prevent Damage to Equipment.
    • Avoid Costs of Replacement / Repair
mains plugs fitting
Mains Plugs Fitting
  • Flex Colours:- Live=Brown, Neutral=Blue Earth=Green / Yellow
  • Avoid whiskers, trapped wires, and ensure that Cord Grips are secure, but don’t pierce the insulation.
  • Fuses are to protect the equipment and you.
  • You will have to wire a plug on the course correctly
mains plug fuses
Mains Plug Fuses
  • The fuse must blow first
  • Not all faults are short circuits
  • So the fuse must blow before causing a fire.
  • Either in the cable or the equipment
  • A 1 Amp panel mounted fuse may protect the equipment, but what fuse is in the plug to protect the cable?
  • Recall P=VI or I=P/VFormula for correct fuse is Current = Power/230
  • A 1A current passing through the body may well be fatal before the fuse blows.
rcd s off switch lightning
RCD’s , OFF Switch, Lightning
  • The shack should be protected by an RCD and a well knownOFF switch, known to all in the house.
  • These operate much faster than a fuse and are much more sensitive to fault conditions, hence providing better protection against electrocution.
  • Any external use of mains power MUST use an RCD.
  • Lightning - Disconnect your Antennas !
  • A nearby strike can also be dangerous to you / equipment.
rf radiation issues
RF Radiation Issues
  • Strong fields from antenna and feeders cause energy to be absorbed by the body, cause heating as in a microwave oven.
  • RF burns can be painless at the time and are only apparent after the event when the damage is done.
  • The eyes are particularly susceptible since there is no cooling from the blood supply.
  • Standing in front of high gain antennas or looking down waveguides are actions most likely to risk over exposure - Don't !!

Dont Panic

  • The HPA and ICNIRP produce guidelines on safe exposure levels
  • See HPA “Investigation levels” document which gives guidanceon limits, above which a more detailed investigation is required to ensure the levels are acceptable. See -