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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

Chelmsford Amateur Radio Society Intermediate Course(9) Safety

Remember the foundation slides
Remember the Foundation Slides

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
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, high winds, icing, bird strikes

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.

  • Damage to self.

  • Damage to Equipment.

  • Cost 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 here 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?

  • Formula 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 known OFF 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 NRPB and ICNIRP produce guidelines on what constitutes safe exposure. See “Investigation levels” document which gives in reasonably straightforward terms guidance on limits, above which a more detailed investigation is required to ensure the level of radiation and absorption is acceptable.