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Enclosure Used
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Industrial enclosures come in a wide variety of shapes and sizes. When purchasing an enclosure, you will likely have many options to choose from and many decisions to make. Fortunately, this means you will be more likely to easily find the indoor or outdoor enclosure that fits your needs. One very important decision you'll need to make is determining the National Electrical Manufacturers Association (NEMA) rating requirement you'll need your enclosure to meet.
NEMA is the trade association for the electrical manufacturing industry. This association provides technical standards that are in the best interest of the electrical manufacturing industry and users. When shopping for your indoor or outdoor enclosure, you'll probably note a NEMA rating assigned to each enclosure type. Understanding these ratings is important to your shopping process and to ensure you purchase the right kind of enclosure for your needs.
There are 13 levels of NEMA ratings. A rating of 1 or 2 indicates an enclosure approved for indoor use. A level 1 enclosure protects equipment from contact with people or falling dirt. Level 2 offers the same protection, but also protects from lightly splashing liquids.
NEMA 3, 3R and 3S ratings are indicated for both indoor and outdoor enclosures. All three levels protect equipment from incidental contact, falling dirt, rain, sleet and snow. Level 3 also protects from windblown dust and indicates that the enclosure will be undamaged by the formation of ice. Level 3R does not protect against windblown dust. Level 3S does protect against windblown dust and also indicates that external mechanisms on the enclosure will remain operable when ice laden.
NEMA 4 and 4X rated enclosures may be for use indoors or outdoors and provide protection against incidental contact, falling dirt, rain, sleet, snow, windblown dust, splashing water and hose-directed water. These enclosures will also be unharmed by the formation of ice. NEMA 4X type enclosures also protect against corrosion.
Type 5 enclosures are for indoor use only and provide protection from incidental contact, falling dirt, settling airborne dust, lint, fibers and flyings. These enclosures also protect against dripping and light splashing of liquids.
Enclosures with a 6 or 6P rating may be for indoor or outdoor use and will protect against incidental contact, falling dirt, hose-directed water and the entry of water during temporary submersion at a limited depth. These will also be unharmed by the formation of ice on the exterior. A 6P rated enclosure will also protect against the entry of water during prolonged submersion at limited depths.
NEMA 7 rated enclosures are indicated for those constructed for indoor use in hazardous or classified locations. Level 8 enclosures may be for indoor or outdoor use and are also indicated for use in hazardous or classified locations. These two levels are used in Class I; Division; and Groups A, B, C, or D classified locations. NEMA 9 enclosures are for indoor use in Class II; Division I; and Groups E, F, or G classified locations. Type 10 enclosures meet the requirements of the Mine Safety and Health Administration.
Ratings of 11 are intended for indoor use and are corrosion resistant and drip proof. NEMA 12 and 12K ratings are also intended for indoor use and protect against falling dirt, circulating dust, lint, fibers and flyings, dripping and light splashing of liquids. Enclosures rated 12 are constructed without knockouts, while 12K rated enclosures are constructed with knockouts.
NEMA 13 rated enclosures are for indoor use and designed to protect against falling dirt, circulating dust, lint, fibers and flyings as well as against the spraying, splashing and seepage of water, oil and non-corrosive agents.
Understanding NEMA ratings will ensure that you purchase the enclosure that's right for your needs. All indoor and outdoor enclosures should be NEMA rated. These ratings not only help ensure industry standards and best practices are maintained, they are also there to help make your buying process go smoothly.
Maggie White writes articles about all sorts of topics. Currently she's focusing on information about industrial enclosures made by companies like American Products.
Using Local Exhaust Ventilation to Control Hazardous Chemical Exposures
There are several methods to control hazardous chemicals. The best method is to eliminate it; the next best solution is to substitute a less toxic or less hazardous chemical for the one in use. If the substance in use cannot be engineered out and there is no way to prevent all harmful levels of exposure, then ventilation is used. The next best method is the wear of personal protective equipment and, when there is no way to control exposure, to regulate the amount of time an employee can be exposed to the chemical through administrative controls. A combination of general ventilation (whole area air circulation) and local ventilation is commonly employed.
Local ventilation is provided through vacuum air suction for removing vapors, gases, and particulates at the source of the airborne contamination. It is a major engineering control for removing hazardous chemical vapors, dusts, and fumes from the point of generation. The vacuuming action prevents the contaminant from entering the worker's breathing zone or from entering general air. There are several types and many applications of local ventilation systems.
Use an enclosed hood when conducting chemical experiments and pouring hazardous materials. These types of enclosed hoods are called chemical fume hoods. They control vapor or particle generation during pouring operations, involving highly reactive or corrosive chemicals or carcinogens. These hoods have a lift or swing door for access at the front of the enclosure.
Use the glove box for greater contaminant exposure control. During normal use, the hood can not be opened; operations and manipulations are performed by putting hands and arms into rubberized/flexible gloves. Glove boxes are normally used when the risk of exposure to minute amounts of a hazardous substance can not be tolerated for the amount of time it takes to complete a task.
A commonly used local ventilation vacuum system is the movable "elephant trunk." The exhaust intake is at the end of a movable or fixed position intake system consisting of a hood over the generation point. Examples of local ventilation at the generation point include capture of airborne contaminants generated by use of solvents, cutting oils, soldering and brazing materials.
For more information about the content of this article, consult Material Safety Data Sheets (MSDS)/Globally Harmonized System Safety Data Sheets (SDS), Section 8, "Exposure Control/Personal Protection." For information about references, products, and solutions involving equipment systems to provide local ventilation, click on this link to access the blog, "Using Local Exhaust Ventilation to Control Hazardous Chemical Exposures."
About the Author
Fredric May is a former occupational safety and health professional who worked for the Occupational Safety and Health Administration and private sector companies providing industrial hygiene expertise in training and work place practices. He is currently a business process management analyst and project management specialist.
How to make a trampoline enclosure?
We have a 30 year old rectangular trampoline. Its been in the fam for years and is now being passed down to me for my children. I need an enclosure for it but its so old that none of the available sites can accommodate attachments for it. Can anyone figure how to rig one? I know gymnastics centers don't have commercial enclosures, they just use netting and ropes attached to the floor and ceilings. My trampoline is outside with no trees.
Do you mean an enclosure to protect your children?
If the bed will be stationary, then it means (without seeing it) that you probably need to put posts into the ground. You'll need to also create a metal frame linking each post at the same level as the trampoline frame as the tramp frame itself usually does this.
I suppose it should resemble this picture:
http://images.google.co.uk/imgres?imgurl=http://www.vipkids.co.uk/Trampolines%2520GB/safety-enclosure02_md.jpg&imgrefurl=http://www.vipkids.co.uk/tgt_trampoline-rctdenc..htm&usg=__8e4Xt-jnXn0IerK2arE94OG_JuI=&h=240&w=350&sz=34&hl=en&start=4&um=1&tbnid=13Wl0JzGgvhtmM:&tbnh=82&tbnw=120&prev=/images%3Fq%3Drectangular%2Btrampoline%2Benclosure%26hl%3Den%26safe%3Doff%26rlz%3D1C1CHMI_en-USGB292GB304%26sa%3DN%26um%3D1
...but instead of the poles are your posts. If it folds away, you would still have room to manoeuvre. After that just use the same type of netting as the normal enclosures in your DIY store use. Or you even buy the attachments and then fix them to the respective post.
You will need some thick foam padding to then go round the posts if they present a danger.
If I find a better way, I'll let you know!
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Town Council will consider financing tipping floor enclosure at May 27 special meeting
The Friday Harbor Town Council will have a special meeting May 27, noon at Town Hall to discuss the County Council's request that the town finance the construction of a structure around the tipping floor at the solid waste transfer station on Sutton Road. The transfer station property is owned by the town. The county leases the site and operates the transfer station. The tipping floor is the ...
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