59 lines
1.6 KiB
Markdown
59 lines
1.6 KiB
Markdown
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---
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tags: [ham-study]
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---
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## Earthing
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Where a safety earth has been fitted, it must not be removed. If changes are
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necessary, a competent professional must be consulted.
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## Plugs, fuses and circuit breakers
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Need to know the plug colours:
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| Colour | Cable |
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| ------- | ---------------- |
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| Live | brown |
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| Neutral | blue |
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| Earth | green and yellow |
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- The flex of the plug cable should be secured.
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- The fuse must match the plug
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- A fuse comprises a thin wire that melts when excessive current flows through
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it, breaking the circuit. When a fuse blows, you should investigate the cause
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and not just blindly replace especially if it is recurrent.
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- Better than a fuse is a Residual Current Circuit Breaker with Overcurrent.
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This can detect currents to earth of over 30mA whereas a fuse just captures a
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few amps and only detects short circuits.
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## General points
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- Only work on the inside of equipment, having first disconnected the power
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source
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- Have a master switch for all radio equipment
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- Safety measures must be taken when using radio equipment outside
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- Wear protective goggles when soldering
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- Very high antennas require lightening protection
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- Antennas and feeders must not be sited close to overhead cables
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- A ladder should be used at a 4:1 height to base ratio and be used with an
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assistant
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- The main health damage from EM radiation is heating of body tissue, especially
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the eyes
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- Antennas and other conductors must not be touched when transmitting
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- Antennas must not be mounted in such a way that people would accidentally come
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into contact with them
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- You must not look down a wave guide
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