View
665
Download
9
Category
Preview:
DESCRIPTION
for course towards Amateur radio license
Citation preview
ELECTRICAL SAFTY
HEART
1. Sinoatrial node2. Atrioventricular node3. Bundle of His4. Left bundle branch5. left posterior fascicle
6. left-anterior fascicle7. Left ventricle8. Ventricular septum9. Right ventricle10. Right bundle branch
HEART
ELECTRICITY
Current kills 10 mA for women 15 mA for men Through the heart
Resistance Skin resistance
About 500 kW when dry About 1 kW when wet
Internal resistance About 80 – 600 W
ELECTRICITY
Stay dry Avoid electricity through the heat
One hand in pocket. Don’t work alone or when tiered No headphones on
ELECTRICITY
Repairing equipment Make sure you have no current in the system Discharge capacitors Power off unplug
LEAD ACID BATTERY
12 V car battery Deep cycle batteries Electrodes
Lead Lead(IV) oxide (PbO2)
Sulphuric acid electrolyte (H2SO4)
LEAD ACID BATTERY
Explosion risk Overcharging Oxygen and hydrogen
Acid risk Add acid to water!
NICAD BATTERIES
1.2V per cell Positive plate : nickel(III) oxide-hydroxide Negative plate : Cadmium Electrolyte: potassium hydroxide (KOH) Explosion risk: release oxygen or hydrogen
Overcharging Reverse charging
GRID POWER SUPPLY
230 V RMS AC, up to 15 A, 3 phase Insulation Earthing
All metal! Morse key Microphone
Remove metal Rings Watches
CE MARK
EU safety mark Health Environment
Groups Electromagnetic Explosion Voltage
POWER SUPPLIES
Isolation Transformer Opto-isolation Bleed resistor
Circuit breakers Switch Current overloads / short circuits Several amps
Residual Current Device (jordfelbrytare) Imbalances between live and neutral 5-30 mA leakage current
ANTENNAS
Watch out for power lines!!! Antennas can heat up
Power losses in the antenna Static Grounding
Don’t touch Live voltage
ANTENNAS
Category 1: < 7 W Category 2: 7-50 W
Category 3: > 50 W
Distance / time
0 m - 0.5m 0.5 m 1 m 1.5 m 2 m
0 s forbidden x x x x30 s x x x x2 min x x x4 min x x6 min x
Distance / time
0 m - 2 m 2 m 4 m 6 m 8 m 10 m
0 s forbidden x x x x x30 s x x x x x2 min x x x x3 min x x x5 min x x6 min x
QUESTIONS?
Recommended