Why is 24VDC used in confined space?
Why is 24VDC Commonly used in Confined Spaces?
There are additional concerns when working with electricity in confined spaces. Things like wetness, metal surfaces, and not being able to move around much can make electrocution far more likely. That’s why it’s typical to use low-voltage systems, such 24VDC or 24VAC, for temporary lighting and tools in these kinds of places.
IEC rules say that voltages below 50VAC or 120VDC are low voltage. When talking about voltages like 12V, 24V, or 48V, nevertheless, the phrase “extra-low voltage” (ELV) is sometimes used. ELV systems lower the chance of deadly shocks, making them better for dangerous and small spaces.
Even damaged cables delivering 110–240V can cause serious harm or death in small spaces like tanks, vessels, and offshore platforms. Not all enclosed areas are considered dangerous (Ex Zones), but many of them have conductive materials or excessive humidity, which makes the risk of electrocution higher. So, low-voltage options are better.
24VAC is the most common choice for ELV, but 48VAC is becoming increasingly popular for temporary lighting since it lets you run longer cables and put up more flexible systems. In places with stronger laws, like Belgium or some sections of the U.S., 12VAC may be needed in hot or humid areas, but this limits how far it may reach and how well it works.
Planning installations correctly is very important. To avoid dangers, transformers that change mains power to low voltage must stay outside the enclosed space. In the end, picking the correct voltage level, type of equipment, and layout makes sure that confined space operations are safe and work well.