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Safety

Safety. High Voltage Electricity and Water are a Dangerous Combination and is one of the greatest hazards students will encounter in these projects, therefore, this section should be thoroughly taught, tested , and constantly reiterated. AC versus DC . AC (Alternating Current).

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Safety

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  1. Safety High Voltage Electricity and Water are a Dangerous Combination and is one of the greatest hazards students will encounter in these projects, therefore, this section should be thoroughly taught, tested , and constantly reiterated.

  2. AC versus DC AC (Alternating Current) DC (Direct Current) • Alternates its current in a sine wave pattern • Typically osculates between 50 and 60 HZ • Typically found in all building wiring. • Typically above 100V (varies from country to country) • Can be deadly! • The current travels the same direction and the voltage is constant • Most commonly comes in the form of Batteries and Power Adapters or Inverters that change AC to DC • Typically low in voltage (1.5V – 32V • Can be deadly! http://phet.colorado.edu/en/simulation/circuit-construction-kit-ac http://www.kropla.com/electric2.htm

  3. A/C Electrical Power Safety • 115 Volts AC can and does kill roughly 100 people each year • Working around water GREATLY increases the risk of serious physical injury • Although it is common for many commercial ROVs to use very high voltages, the people designing and operating them are trained and certified professionals – you are not! • Therefore: • A/C Power should never enter water at any time and • Working with A/C power near water should be done minimally and with the highest regard of safety

  4. If you must… …work with A/C Power around water, commit the following to memory or retype and post near outlets in the room as a reminder to all. • NEVER touch a device that is plugged in if either you or the device is in contact with the water

  5. CERTIFY • that any device plugged into a wall socket around water is plugged into a working GFI Outlet GFI and GFCI are the highest rated quickest to respond to any short circuit The cord on the right uses an in-line circuit breaker, and should only be used in conjunction with a GFI wall outlet

  6. NEVER • Work on any electrical system while it is plugged in (this includes small DC wall adapters and Batteries of all types) Let your body become the electrical pathway to the ground

  7. ALWAYS • Have a responsible person with you (preferably trained in CPR and First Aid) • Work in a dry uncluttered place • Use tools with insulated handles • Check and Double-check that everything is unplugged before working with hands or tools • Ensure that there is no latent charge in components that may have stored voltage after the device has been unplugged

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