An Explanation of NEMA 12, 4 and 4X Enclosure Ratings

EXAIR Cabinet Cooler Systems are rated to NEMA 12, 4, and 4X. But what does that actually mean?

NEMA stands for National Electrical Manufactures Association. This organization, founded in 1926, sets standards for the manufacture of safe and effective electrical products. It is an ANSI-accredited standards developer and, as such, has much credibility in the industries it serves. Many companies require or encourage the use of NEMA-rated equipment. Not having it may limit a company’s access to certain markets. In that testing, if required, is not too involved, achieving a rated unit is actually quite doable and, in the long run, worth it for safety-sake. NEMA-rated enclosures are about controlling a substance’s ability to either enter or exit an enclosure protecting electronics. Keeping you, and the electronics, safe is what this is all about. NEMA ratings are 1 through 13 with EXAIR’s cabinet cooler systems meeting NEMA 12, 4, and 4X.

So, what are NEMA 12, 4, and 4X? Simply stated:

  • NEMA 12 = resistant to dirt and oil
  • NEMA 4 = splash resistant
  • NEMA 4X = splash and corrosion resistant
    • To be rated NEMA 12, the enclosure must be built in such a way to prevent solid contaminants like air-born dust, dropping dirt, fibers, fly-off shavings, and lint from getting inside. It must also prevent dripping or slightly splashing water and oil and non-corrosive coolants from seeping, spraying, or being splashed into it.
    • NEMA 4 must be resistant to splashed or sprayed water and rain, sleet, or snow and not be damaged by ice forming on the outside. It must also prevent entry of solid contaminants like dust and dirt.
    • NEMA 4X is identical to NEMA 4 with the addition that the enclosure must be corrosion resistant.

How does this apply to EXAIR Cabinet Cooler Systems?

With our UL listed NEMA rated Cabinet Coolers, we can cool your cabinet and maintain its original enclosure integrity to protect your electronics just as needed. Our NEMA 12 cabinet cooler system is ideal for general industrial environments. Our NEMA 4 cabinet cooler system incorporates a low pressure relief valve for both the vortex tube and the cabinet air exhaust that closes and seals when the cooler is not operating to maintain the integrity of the NEMA 4 enclosure. Our NEMA 4X cabinet cooler system has the same low pressure relief valve as the NEMA 4 and is made of stainless steel, allowing for protection in corrosive and/or wash-down environments.

To further enhance their effectiveness, EXAIR offers thermostat controls to turn the units on and off as needed, which conserves compressed air. They are available with a simple thermostat (120V and 240V), an electronic temperature control or ETC thermostat (120V and 240V) which is adjustable from outside the enclosure and provides feedback of the internal temperature. Other models include a non-hazardous purge thermostat control, continuous operation, and high temperature versions that comply with NEMA 12, 4, and 4X ratings. We can meet cooling capacities (Btu/hr) at 100psig ranging from 275 to 5600. To assist in determining which system will work in your cabinet, a sizing guide is even available on our website.

Cabinet Cooler Family
EXAIR’s Cabinet Cooler Systems

If you have a cabinet that needs cooling and it is rated to NEMA 12, 4, or 4X, let us know how we can help. Chances are pretty good we can provide the cabinet cooling system you need.

John Pinchek
Application Engineer
johnpinchek@exair.com
@EXAIR_JP

Video: How To Install A Cold Air Distribution Kit

The video below shows how to install an EXAIR Cabinet Cooler’s Cold Air Distribution Kit

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

Can We Help Identify Your Existing EXAIR Product? – Yes.

From time to time we have customers call in and say “We have one of your products and need another. But we installed it so long ago that we no longer have the paperwork to know which model we bought.” That’s a great thing to hear in a way. Our products have outlasted their filing system, and not only that, but now we have potential to solve another problem for the same customer.

When this happens, we can sift through our files to find out which model was purchased, or if the original purchase was made through a third party, we can determine the model number in other ways. We can use the dimensions, material of construction, description over the phone, or a photo emailed to an Application Engineer such as the one below.

Cabinet Cooler

But, the needs of the application don’t end there. We may be able to pinpoint the model number of the device currently in use, but we also need to confirm that this model will be suitable for the new application. For the end user that sent in the photo above, this meant the completion of a Cabinet Cooler Sizing Guide for new heat load calculation.

What we determine in many cases is that the new application has specific needs which dictate the use of a product with different attributes (in this case a different Btu/Hr rating on a Cabinet Cooler). Whether it is because of heat load, ambient temperature concerns, required material, or any other variable, we are sure to provide the most suitable solution.

As spring gains momentum and warmer months are to come, it may be time to consider an EXAIR Cabinet Cooler solution for an overheating electrical panel in your facility. Contact an EXAIR Application Engineer for help calculating heat load and choosing the right system.

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

Cabinet Coolers Keep Working at Full Capacity After Six Years of Near Constant Operation

I was digging through my old application files today and ran across an application that I worked on with our Indonesian distributor (PT Interwira Lancar Mandiri).  Our distributor had a customer who was in the business of manufacturing automotive radiators. The end customer contacted them with a problem relating to a failed motor drive which caused one of their two production lines to come to a stop.

The end customer had a Freon based air conditioner set on his panel, but the air conditioner began leaking water into the inside of the panel. The water got into the motor drive, shorted it out and caused the production line to go down. Not only was the production down for 1 month, but the motor drive cost them $20 k USD to replace by the time they purchased, had it shipped and got it installed.

The customer was extremely wary of what he was going to use for an air conditioner unit because there was no getting around keeping these motor drives cool. So, our distributor introduced the customer to EXAIR Cabinet Cooler and the customer purchased Model 4330 for his panel.  Our distributor was back in the customer’s plant on another issue some six years later when he saw the old EXAIR Cabinet Cooler system still on the motor drive panel, cranking out cold air. No maintenance had been performed on the Cabinet Cooler System in that time (as none was necessary) even though the environment was quite dirty. You can see from the photos below that the place had not been cleaned in a long time.

CC1

When we talk to customers about the EXAIR Cabinet Cooler Systems, one of their initial concerns is how long they last. Because there are no moving parts to wear out, the life span can easily be in the range of 20 years or more. You would have to purchase 4 Freon based units, pay to have them changed out and pay for them to be maintained 2 – 4 times per year, changing filters, replacing compressors, and re-filling coolant in that time.

Not only does the Cabinet Cooler last a long time, but when it is operating, it produces a positive pressure onto the panel which keeps dust and debris from getting inside your cabinet over time.

CC3

Neal Raker, Application Engineer
nealraker@exair.com

High Temperature, Dual Cabinet Cooler Systems Make the Grade for Extreme Duty Operation

HTDCC

EXAIR Corporation and our products have a robust presence in many overseas places. I should know. I work directly with many of our overseas clients, especially in the Middle East region where just the ambient temperatures climb to 60°C (140°F). If you take that high heat ambient condition and throw in the fact that our customers are working in petrochemical, chemical, cement, glass and plastic industries, the conditions in these manufacturing plants can be torturous not only to personnel but also to the many cabinets which reside in these processes.

I am working presently with a customer in Saudi Arabia who specializes in production of specialty pipe products which combine glass-fiber, resin and sand to produce pipes which can withstand highly corrosive and/or abrasive applications. When you have these kinds of raw materials moving around a production environment, you not only have the issue of high heat conditions, but also the egress of these fine materials into various panels causes many pre-mature failures. As many of us know, housekeeping will usually take a back seat to production. So, the customer is looking for a solution that can keep their panels cool enough to operate and also provide a means to keep a positive pressure to keep these raw materials from migrating inside their panels.

The specific application we are starting with is a panel located very near to where the sand charge is dumped into a mixer to be combined with the resin. The cabinet size is 1200 mm (h) X 1200 mm (W) X 400 mm Depth. The temperatures in this area get up to 60°C and with his internal heat load, his cabinet is getting up to 51°C under present conditions. I asked the customer to fill out a Cabinet Cooler Sizing Guide for me so I could have all the data necessary to run heat load calculations for him. We performed the calculations and came up with 1,170 Btu/hr. that he needed in this case.

After determining the heat load, I evaluated our available HT Cabinet Cooler models and settled on one of the Dual Cabinet Cooler systems to provide them with trouble-free cooling. The specific model was HT4360-240 (NEMA 12, High Temperature, Dual Cabinet Cooler System with 240 VAC thermostat control).

Since this is a technology that the customer was not familiar with prior to our contact, he is exercising prudence and has installed one unit for the time being and is evaluating its performance. This is a fairly new installation. So far, the customer has been satisfied with the performance.

Cabinet Cooler Systems can withstand very demanding applications like the one above. With proper selection and guidance from our experienced Application Engineering staff, you can be assured of similar, good performance in your application as well.  Present us with your challenging application today!

Neal Raker, Application Engineer
nealraker@exair.com

Like a Donkey Between Two Haystacks

90Day_Temp

Having been born and raised in the northern climates, for me 80 degrees is hot. So when temperatures soar into the 90’s I really struggle to cope. Bad news is that according to NOAA, we are in store for above average temperatures for the remainder of the summer!

High temperatures are not only uncomfortable for we humanoids, electronics suffer as well. The demand for panel cooling is extensive and my company, EXAIR, produces Cabinet Cooler systems. There in lies my dilemma. I would like to wish for the heat to go away but then that would be wishing ill for my company. I’m like a donkey trying to decide between two hay stacks.

So, I will stay in my air conditioned cubical and calculate cooling requirements for customers. I would welcome the opportunity to assist you with your panel cooling requirements. Give me a call at 1-800-903-9247

Joe Panfalone
Application Engineer
Phone (513) 671-3322
Fax (513) 671-3363
Web: http://www.exair.com
Twitter: http://www.twitter.com/exair_jp
Facebook: http://www.facebook.com/exair

Doomsday Prepper or Just Being Prepared?

I watched “Doomsday Preppers” for the first time on TV. My initial take was that these folks have a screw loose. But then I remember the pictures of  the devastation Hurricane Sandy caused. It was cold and people were without food and shelter. Mobility was limited due to fallen trees and gasoline unavailable. Many of the residents were overcome with anxiety and mental breakdown.sandy

When hurricane Ike came through Cincinnati we lost power for several days. Lucky for us it was mild weather so shelter was not an issue and we still had water service. The worst was overcoming the temptation to open the fridge to get a beer.

This really got me to thinking. What would I do if I were thrust into a real dire situation. What if that meteorite had landed in Texas and taken out the refineries. A major disruption in fuel supplies would cripple the trucking industry, without gas farmers could not harvest the crops, businesses could not open their doors, without a job to go to, people would not have the money to buy supplies. OMG! , I am starting to sound like a “prepper”! In all reality, one does not have to go to the extremes but at least be prepared.

How well is your facility prepared for the impending heat this summer? Will you wait to experience a shutdown because of overheated control panels, or you preparing now for panel cooling?  EXAIR has a complete line of Cabinet Coolers , to cool your electronic enclosures, that have no moving parts and use compressed air for power . Now is the time to be thinking of beating the heat. Feel welcomed to contact one of our application engineers to go over your cooling requirements.

Joe Panfalone
Application Engineer
Phone (513) 671-3322
Fax (513) 671-3363
Web: http://www.exair.com
Twitter: http://www.twitter.com/exair_jp
Facebook: http://www.facebook.com/exair