Electrical Safety

Understand electrical hazards in industrial settings and the protective measures that prevent electrocution and arc flash.

The damage caused by an electric shock depends on the Intensity (Amperage), the Duration of exposure, and the Path through the body.

Electrocution: Interruption of the heart or respiratory rhythm that results in death.
Burns: Both external (at entry and exit points) and internal (destruction of organs and tissues).
Secondary Effects: Violent muscle contractions (tetanization) that can cause falls from heights or the ejection of objects.

Factor	Influence on Risk
Body Resistance	Dry skin offers higher resistance; wet or sweaty skin reduces resistance drastically.
Current Path	Paths passing through the heart or head (e.g., hand-to-hand) are the most critical.
Voltage (V)	Higher voltage increases the current’s ability to overcome body resistance.

Alternating Current (AC): Standard grid power. Highly dangerous as it can cause ventricular fibrillation even at relatively low voltages.
Direct Current (DC): Used in batteries and solar panels. Can cause deep internal chemical burns and cardiac arrest.
Static Electricity: Built up by friction on non-conductive materials. Primary industrial risk is spark generation in flammable (ATEX) atmospheres. Prevention: dissipative footwear, humidity control, and equipotential bonding.

Double Insulation: Tools marked with two concentric squares. They do not require a ground connection because their design prevents outer metal parts from becoming energized.
Grounding (Earthing): Channels leakage currents into the ground, preventing the worker’s body from becoming the conductor.
Residual Current Device (RCD / Differential Switch): Cuts the power in milliseconds when it detects a current leak.
Safety Voltage (SELV): Use of 12V, 24V, or 50V in high-risk environments like wet areas or metallic confined spaces.

Extension Leads: Must be fully unrolled to prevent overheating due to induction (the “coil effect”).
IP20: For dry interiors only (protected against finger touch).
IP44: Protected against splashing water (suitable for common outdoor use).
IP67: Protected against temporary immersion.

Never use cables with electrical tape repairs or plugs showing burn marks.

Never touch a victim who is still in contact with the current!

Isolate the source: Turn off the main switch or unplug the equipment.
No direct contact: If power cannot be cut, separate the victim using a non-conductive object (dry wood, plastic).
First Aid: Once the area is safe, check breathing and pulse. Start CPR if necessary and call emergency services.