electrical safty

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?