Electrical safty
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Transcript of Electrical safty
![Page 1: Electrical safty](https://reader033.fdocuments.net/reader033/viewer/2022051015/5538a0fc4a79597c778b47cf/html5/thumbnails/1.jpg)
ELECTRICAL SAFTY
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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
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HEART
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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
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ELECTRICITY
Stay dry Avoid electricity through the heat
One hand in pocket. Don’t work alone or when tiered No headphones on
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ELECTRICITY
Repairing equipment Make sure you have no current in the system Discharge capacitors Power off unplug
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LEAD ACID BATTERY
12 V car battery Deep cycle batteries Electrodes
Lead Lead(IV) oxide (PbO2)
Sulphuric acid electrolyte (H2SO4)
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LEAD ACID BATTERY
Explosion risk Overcharging Oxygen and hydrogen
Acid risk Add acid to water!
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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
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GRID POWER SUPPLY
230 V RMS AC, up to 15 A, 3 phase Insulation Earthing
All metal! Morse key Microphone
Remove metal Rings Watches
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CE MARK
EU safety mark Health Environment
Groups Electromagnetic Explosion Voltage
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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
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ANTENNAS
Watch out for power lines!!! Antennas can heat up
Power losses in the antenna Static Grounding
Don’t touch Live voltage
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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
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QUESTIONS?