Can anybody share how to convert 230 Volt in to 24 Volt for working in confined space. Can we use LED lights in confined space if can which capacity (Watt) ? Thanks & Regards Kailash
From India, Mumbai
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4From India, Mumbai
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Dear Kailash Bharadwaj,
As per approved safety measures, what you have asked is correct. In a confined space, only 24 Volts supply is to be taken inside for lighting purposes. There are approved safe STEP DOWN TRANSFORMERS (240 / 24 volts) available for this purpose. These will be located outside. Only the output lead carrying 24 Volts will be taken to the confined space. These lamps come with special shades/grill-type cover. Wattage will depend on the number of lamps you need. A safety-approved vendor will furnish the details. In a closed space, you have to be careful about obnoxious vapor/gas as well. Furthermore, you have to exercise caution if the inside ambiance is likely to be wet.
V. Raghunathan
From India
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As per approved safety measures, what you have asked is correct. In a confined space, only 24 Volts supply is to be taken inside for lighting purposes. There are approved safe STEP DOWN TRANSFORMERS (240 / 24 volts) available for this purpose. These will be located outside. Only the output lead carrying 24 Volts will be taken to the confined space. These lamps come with special shades/grill-type cover. Wattage will depend on the number of lamps you need. A safety-approved vendor will furnish the details. In a closed space, you have to be careful about obnoxious vapor/gas as well. Furthermore, you have to exercise caution if the inside ambiance is likely to be wet.
V. Raghunathan
From India
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Dear Kailash,
We had a great discussion on the use of 24V supply inside confined spaces in the past in this forum.
We came to a common conclusion that the supply inside confined space should be robust with earth leakage protection, instead of just being 24 volts. If your supply to a confined space is routed through a proper ELCB/RCCB/RCBO, then you can even use 230 V inside the confined space.
As mentioned by Raghunathan, people do use Step Down Transformers, and it is best practice to adopt this. In that case, what about your welding machine cables and grinders inside confined spaces? Are you going to ensure a 24V supply for those too?
If you are interested, please read our earlier post and the reply from Mr. Kesava Pillai:
https://www.citehr.com/231984-occupa...nload-pg4.html
If you want to learn more about Confined Spaces, please reply to the questions in the thread below asked by Mr. Kesava Pillai. I would love to participate if someone is interested.
https://www.citehr.com/537582-confin...ace-entry.html
I was thinking that I have a good understanding of confined spaces. Recently, I got this question during one of my training sessions and failed to answer, so I learned more. Why does it say to ventilate at a rate of at least four (4) volumes per hour inside confined spaces?
Dear V. Raghunathan,
Thank you for your response and active participation. Much appreciated. Please keep up the rhythm.
From India
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We had a great discussion on the use of 24V supply inside confined spaces in the past in this forum.
We came to a common conclusion that the supply inside confined space should be robust with earth leakage protection, instead of just being 24 volts. If your supply to a confined space is routed through a proper ELCB/RCCB/RCBO, then you can even use 230 V inside the confined space.
As mentioned by Raghunathan, people do use Step Down Transformers, and it is best practice to adopt this. In that case, what about your welding machine cables and grinders inside confined spaces? Are you going to ensure a 24V supply for those too?
If you are interested, please read our earlier post and the reply from Mr. Kesava Pillai:
https://www.citehr.com/231984-occupa...nload-pg4.html
If you want to learn more about Confined Spaces, please reply to the questions in the thread below asked by Mr. Kesava Pillai. I would love to participate if someone is interested.
https://www.citehr.com/537582-confin...ace-entry.html
I was thinking that I have a good understanding of confined spaces. Recently, I got this question during one of my training sessions and failed to answer, so I learned more. Why does it say to ventilate at a rate of at least four (4) volumes per hour inside confined spaces?
Dear V. Raghunathan,
Thank you for your response and active participation. Much appreciated. Please keep up the rhythm.
From India
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Thank you, Mr. Dipil, for your email.
A 24-volt light source is the safest way to start any activity in a confined space. It is just the beginning. As you rightly pointed out, we need to use higher voltages to carry out maintenance work. This is usually done after ensuring adequate safety measures. There are instances when scaffolding needs to be built, and these activities should be carried out step by step.
I am not exactly aware of the "four times volume sweep." However, the logic is not difficult to understand. It is somewhat similar to the concept of the factor of safety. What is your preferred number, two or three? The factor of safety is typically determined based on experience.
You can consider the thickness of lift/elevator ropes as an example. While higher numbers may provide more comfort, experience often leads one to opt for proven economical designs.
In a confined space, one can expect heat, dust, toxins, odors, vapors, etc. More air is needed to mitigate these effects and ensure an adequate air supply for individuals to breathe safely. While more than four units of air exchange are preferable, the number four may have been chosen based on reliable past experiences. Perhaps OHSAS covers this aspect.
Some of the largest operations I have witnessed include the underground mining of non-ferrous metals such as zinc, silver, cadmium, lead, etc. Numerous people work several meters below mean sea level, with very large machinery powered by diesel/electricity operating below ground level.
Adequate ventilation is ensured by pumping fresh air from the ground level. The Director General of Mines and Safety (DGMS) is the statutory authority governing these operations. Valuable lessons about high safety standards can be learned from these operations.
I recently came across an interesting presentation and a good article on the internet. Both are attached to this post. I hope these additions provide some value.
V. Raghunathan
From India
Acknowledge(0)Amend(0)
A 24-volt light source is the safest way to start any activity in a confined space. It is just the beginning. As you rightly pointed out, we need to use higher voltages to carry out maintenance work. This is usually done after ensuring adequate safety measures. There are instances when scaffolding needs to be built, and these activities should be carried out step by step.
I am not exactly aware of the "four times volume sweep." However, the logic is not difficult to understand. It is somewhat similar to the concept of the factor of safety. What is your preferred number, two or three? The factor of safety is typically determined based on experience.
You can consider the thickness of lift/elevator ropes as an example. While higher numbers may provide more comfort, experience often leads one to opt for proven economical designs.
In a confined space, one can expect heat, dust, toxins, odors, vapors, etc. More air is needed to mitigate these effects and ensure an adequate air supply for individuals to breathe safely. While more than four units of air exchange are preferable, the number four may have been chosen based on reliable past experiences. Perhaps OHSAS covers this aspect.
Some of the largest operations I have witnessed include the underground mining of non-ferrous metals such as zinc, silver, cadmium, lead, etc. Numerous people work several meters below mean sea level, with very large machinery powered by diesel/electricity operating below ground level.
Adequate ventilation is ensured by pumping fresh air from the ground level. The Director General of Mines and Safety (DGMS) is the statutory authority governing these operations. Valuable lessons about high safety standards can be learned from these operations.
I recently came across an interesting presentation and a good article on the internet. Both are attached to this post. I hope these additions provide some value.
V. Raghunathan
From India
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