While it is TRUE that you can get a shock from batteries (try touching the end of your tongue to the terminals of a 9 volt radio battery) the shock can hurt but generally they won't be fatal. HOWEVER please read the following:
Risks Associated with 48V DC
Electric Shock: Although 48V DC is less likely to cause fatal electric shocks compared to higher voltages (like 120V AC), it can still be dangerous under specific circumstances. For instance, if a person has wet skin or if the current finds a path through vital organs, it could potentially lead to serious injury or death.
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Current Levels: The danger of electric shock is not solely dependent on voltage; it also depends on the current flowing through the body. For DC, the threshold for causing fibrillation (a life-threatening heart condition) is higher than for AC. Generally, currents above 20 mA can be dangerous, and while 48V DC is less likely to reach these levels, it is not entirely without risk.
I don't know what voltage this device operates at, but always be safe around electricity!
I don't know what voltage this device uses, but be safe around electricity.
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Environmental Factors: The risk increases in environments where the body’s resistance is lowered, such as in wet conditions. Additionally, if a person is trapped in a position where they cannot let go of a live conductor, even low voltages can become dangerous.
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Conclusion
In summary, 48V DC is generally considered safe for most applications, especially when proper safety measures are in place. However, it is essential to treat all electrical systems with caution and respect, as even low voltages can be hazardous under the right conditions. Always ensure that installations are performed by qualified professionals and that safety protocols are followed to minimize risk