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3rd Edition
Comparison of Test Results
Followed by: Food For Thought -
"Doing The Remarkable" |
December 2009 |
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CONGRATULATIONS Bobby Braun
SGM Engineering, Inc., Orlando, FL -
winner of the $25. Home Depot gift card.
Mr. Braun was the first to correctly complete the following sentence:
'A Type 2 SPD is a permanently connected device that can be installed ONLY on the load side of the main overcurrent protective device.'
Answer can be found in the SSI 3rd Edition #5 Newsletter -
"Nominal Discharge Current - What and Why?" released 9-1-2009
( Link to newsletter archive) |
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Spread a Little Cheer...
Let's face it - big or small, we all love toys!
Be the first to correctly answer the 3rd Edition
challenge question below to win a $25.00
Toys-R-Us gift card.
The staff and management of SSI extends
warm holiday wishes including good health
and prosperity in the coming year. |
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Special Edition Featured Article:
Standard for Surge Protective Devices
'Comparing the Test Results -
Understanding the Rating Levels' |
To recap some of our previous discussions, we have looked closely at the various ratings required by UL 1449 Third Edition. These included the Nominal Discharge Current Ratings (IN) and the Voltage Protection Ratings (VPR).
If you recall, we also discussed the difference between the waveforms for Second Edition and Third Edition of UL 1449. Specifically the Second Edition waveform utilized to determine the Suppressed Voltage Rating (SVR) was a 6 kV/500 A combination wave. By contrast, the waveform utilized to determine the Voltage Protection Rating (VPR) in the Third Edition is a 6 kV/3 kA combination wave.
In the Second Edition, the Duty Cycle test, conducted using the 6 kV/3 kA combination wave, was conducted before and after the measured limiting voltage tests used to determine the Suppressed Voltage Ratings.
The same basic principle applies to the Third Edition. However, in the Third Edition, the Voltage Protection Rating is based on the 6 kV/3 kA and, for permanently connected devices (Type 1 and Type 2, typically) the duty cycle test is replaced by the Nominal Discharge Current Test discussed in the previous article. For Type 3 devices (cord connected and plug in devices) the Voltage Protection Rating is the same (6 kV/3 kA) and the duty cycle test using the same waveform is conducted.
Taken from Table 63.1 of UL 1449, the following shows how the VPRs are determined based on specific measured limiting voltage test results when conducting the surge testing according to Section 37 of UL 1449:
VOLTAGE PROTECTION RATING (VPR)
Measured Limiting Voltage Minimum Voltage Protection Rating (V)
330 or less 330
331-400 400
401-500 500
501-600 600
601-700 700
701-800 800
801-900 900
901-1000 1000
1001-1200 1200
1201-1500 1500
1501-1800 1800
1801-2000 2000
2001-2500 2500
2501-3000 3000
3001-4000 4000
4001-5000 5000
5001-6000 6000
When comparing test results and ratings marked, it is critical to understand how this chart comes into play. For example, if a product has a measured limiting voltage of 401, it will have a VPR of 500. At the same time, if a product has a measured limiting voltage of 499 or 500, it has a VPR of 500. In essence, there can be a 99 volt difference in measured limiting voltages between products and they can both have the same VPR. In some situations and application, this may not be significant. In other applications, it can be critical. This is why it is important to not only compare VPRs and other ratings, but to also compare additional test results to ensure that the product needed for the application is the product being installed.
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| COMING SOON...
...In our next 3rd Edition newsletter, join us for the 'Difference in Current Tests' (specifically the low, intermediate and high current abnormal overvoltage tests).
No need to be empty-handed...
Be the first to answer the following
question correctly and win a $25.00
Toys-R-Us gift card:
"The Voltage Protection Rating (VPR) is
based on the 6kV/3kA combination
waveform and, for permanently
connected devices (Type 1 and Type 2,
typically), the duty cycle test is
replaced by the ____________ Test."
E-mail your answer to
your contact information today. Good luck!
(Contest excludes employees/distributors/resellers of SSI) |
Click on link to inquire about anything related to 3rd Edition. Submittals have a chance to be featured in a future newsletter!
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Food For Thought |
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Doing The Remarkable By: Jim Rohn |
When it comes to meeting and conquering the negativity in your life, here is a key question: what can you do, starting today, that will make a difference? What can you do during economic chaos? What can you do when everything has gone wrong? What can you do when you've run out of money, when you don't feel well, and when it's all gone sour? What can you do?
Let me give you the broad answer first. You can do the most remarkable things, no matter what happens. People can do incredible things, unbelievable things, despite the most impossible or disastrous circumstances.
Here is why humans can do remarkable things: because they are remarkable. Humans are different from any other creation. When a dog starts with weeds, he winds up with weeds. The reason is because he's a dog. But that's not true with human beings. Humans can turn weeds into gardens.
Humans can turn nothing into something, pennies into fortune, and disaster into success. And the reason they can do such remarkable things is because they are remarkable. Try reaching down inside yourself; you'll come up with some more of those remarkable human gifts. They're there, waiting to be discovered and employed.
With those gifts, you can change anything for yourself that you wish to change. And I challenge you to do that because you can change. If you don't like how something is going for you, change it. If something isn't enough, change it. If something doesn't suit you, change it. If something doesn't please you, change it. You don't ever have to be the same after today. If you don't like your present address, change it - you're not a tree!
If there is one thing to get excited about, it's your ability to make yourself do the necessary things, to get a desired result, to turn the negative into success. That's true excitement!
Reprinted with permission from Jim Rohn International ©2009. The late Jim Rohn was a world-renowned motivational speaker and success expert. For more information on Jim and his popular personal achievement resources, visit www.JimRohn.com. | |
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