Dear Mr. or Ms ,
Transition of Recognized Component Transient Voltage Surge Suppressors (XUHT2)
Surge protection devices, such as metal oxide varistors (MOVs), gas discharge tubes (GDTs) and similar devices, are typical “Critical Components” used in power supplies and equipment such as Information Technology Equipment (ITE). The requirements used to evaluate these devices are found in UL 1449.
There is an on-going Industry File Review (IFR) for UL 1449 2nd Ed that requires all existing Recognized Component surge protection devices complying with UL 1449 2nd Ed to be upgraded to the latest requirements contained in UL1449 3rd Ed by September 30, 2009. One result of this IFR is that the upgraded devices are certified under the new category (control number) VZCA2 and the current category XUHT2 will become obsolete.
Our engineering staff is aware of the ongoing IFR and when surge protection devices are used in the end products, they will confirm the current certification category for the protector used in the end product. However, there are still many end product procedure descriptions in place that reference the XUHT2 category. This raises the concern that an existing XUHT2 device described as a critical component in an end product report but is now certified under VZCA2 could be identified as a Variation Item during the end product Follow-Up Services inspection. To ensure a smooth transition without having unintentional Variation Notices (VNs) written for end products, UL’s field staff received instructions regarding handling of this issue when conducting a Follow-up Service inspection.
The instructions provided to UL’s field staff are intended to allow for a smooth and practical transition to the new category for the surge protectors (VZCA2) so end product manufacturers can utilize remaining stock of XUHT2 components. A summary of the various scenarios that might be faced in your end product Follow-up Service Procedure is as follows:
When surge protectors are described as Recognized Components under XUHT2, the verification of the component in the end product may be as follows:
1. If the surge protector device’s manufacturer and part number matches the Procedure description of the XUHT2 component, Recognition information of the existing component description under VZCA2 shall be determined.
(a) If the existing part number is found in VZCA2 and the device’s manufacturer name, type designation and other technical specifications comply with the parameters specified under VZCA2; the part may be used in the end product.
(b) If the existing part number is not found in VZCA2, the end product manufacturer will be asked for documentation from the device manufacturer confirming eligible Recognition under XUHT2 (i.e. the parameters described in the procedure and produced prior to the effective date.) If confirmed, the existing stock of Recognized XUHT2 components may be used.
In the above cases, no VN will be issued. However, the Procedure description will need to be updated to reflect the current component Recognition. For this purpose, the UL Field Representative will issue a Procedure Error Report (PER) for the sake of convenience. The Applicant/Manufacturer will also be encouraged to submit a request for the updated Surge Protective Device’s description (at no charge) so the end product Follow-up Service Procedure is accurate.
2. If the surge protector device’s manufacturer and part number do not match the Procedure description of the XUHT2 component, Recognition of the new component will be checked under VZCA2.
(a) If the new part number is found under VZCA2 and the Procedure parameters, including manufacturer’s name and technical specifications, comply with the parameters specified per the Procedure and as described under VZCA2, the device may be used in the end product. The end product manufacturer will also be asked for documentation from the device manufacturer confirming the correlation between the new part number under VZCA2 and previous part number under the obsolete XUHT2 category. In this case, no VN will be issued. However, the Procedure description needs to be updated to reflect the current component Recognition. For this purpose, the UL Field Representative will issue a Procedure Error Report (PER) for the sake of convenience. Applicant/Manufacturer will also be encouraged to submit a request for the updated Surge Protective Device’s description (at no charge) so the end product Follow-up Service procedure is accurate.
(b) If the new part number is not found in VZCA2, a Variation Notice will be issued since this represents an alternate part number being used.
3. Should the Procedure description indicate the device is Recognized under the new category, VZCA2, components under XUHT2 will not be accepted, even if the described parameters are met. XUHT2.GuideInfo
Transient Voltage Surge Suppressors - Component
The basic standard used to investigate products in this category is UL 1449, "Transient Voltage Surge Suppressors."
VZCA2.GuideInfo
Surge Protective Devices - Component
The basic standard used to investigate products in this category is ANSI/UL 1449, "Surge Protective Devices" (third edition).
2 个 CCN 都是跟据 UL 1449, 只是要求版序更新, 但这个版序更新连名称及CCN 亦一同更改! 是要变了,我们总公司今天也通知我们了 UL 1449-2009 Surge Protective Devices 不知道这个新的CCN是否是强制要求Varistor通过6KV / 3KA的测试呢？因为申请ITE第二版时老是遇到这个问题。 不是2010，而是2009.9.2９，也就是说现在就要用ＶＺＣＡ了。
还有楼上的问题，并不是所有的ＶＺＣＡ都会做６ＫＶ／３ＫＡ的测试的。具体的你可以看看ＵＬ１４４９－３的Ｃｌａｕｓｅ ３７．１。
其他的没有做过６ＫＶ／３ＫＡ的会放在Ｏｔｈｅｒ这个ｃａｔｅｇｏｒｙ里面，对于Ｔｙｐｅ １， ｔｙｐｅ ２， ｔｙｐｅ ３， ｔｙｐｅ ４等，也可以看看ＵＬ黄卡上的Ｇｕｉｄｅ ｉｎｆｏｒｍａｉｔｏｎ是怎么说的。
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