What Are the Basics of Electrical Safety?
Safety is always the priority when working with electronics and electricity. Low-voltage circuits are usually safe, but high voltages like the mains (230 V) can be lethal. A few basic rules eliminate most of the risk.
Low- and High-Voltage Risk
A 5 V circuit is generally harmless; but as the voltage rises, the current that can pass through the body becomes dangerous. What really harms a person is the current passing through the body.
Basic Safety Rules
- Where possible, cut the power before working on a circuit.
- When working with mains voltage, work one-handed and don't touch with wet hands.
- Don't use cables/tools with damaged insulation.
- Don't touch high-voltage circuits without grounding.
Fuses and Insulation
A fuse and circuit breakers cut the circuit when the current exceeds a safe limit, preventing fire and damage. Insulation prevents contact with dangerous voltage.
Short Circuits and Heating
A short circuit leads to overcurrent and heating; that means a fire risk. A heating cable, melting insulation or a burning smell requires immediate action.
Common Mistakes
- Working under power: unnecessarily working on an energized circuit is the most common accident.
- Wrong fuse rating: a fuse with too high a rating provides no protection.
- Skipping grounding: chassis grounding on metal-body devices is for safety.
Frequently Asked Questions
Is low voltage always safe?+
Is working with mains voltage safe?+
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