Fluke Cv400 Clirvu Application Note UL Recognized And Listed

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Application Note

UL Recognized and UL Listed:

What’s the difference?

Thermal imaging or infrared

imaging has become com-

monplace in most daily plant

operations. As the number of

infrared scans increases, so too

does the exposure to and risk

of arc flash. Enclosures must

be opened to scan with infra-

red (IR) and doing so greatly

increases the likelihood of an

arc flash explosion. IR windows

can mitigate this risk by allowing

infrared scans to be performed

without opening enclosures,

virtually eliminating the risk of

an arc flash.

While the reasons to install

IR Windows are quite clear, a

common question posed by those

considering the installation of IR

Windows into UL Listed switch-

gear is ‘Won’t the UL Recognized

IR Window de-rate my UL Listed

switchgear?’ The misconception

is that UL Recognized products

are somehow inferior to UL Listed

products. This is not true.

UL Listed products are ‘end

products’ or products that stand

alone and are not designed to

be included as a component in

another product. A computer or

electrical switchgear are exam-

ples of end products that you buy

and use as-is.

In contrast, UL Recognized

products are considered to be

components of an end product.

A UL Recognized product is not

considered to be an end prod-

uct in and of itself, as it must

be incorporated into an end

product in order to be used with

any real purpose. For instance,

a computer micro-chip is UL

Recognized because it would

never be used on its own; it

would always be installed in to

a computer. Similarly, electrical

fuses are UL Recognized because

they are designed to be used in

electrical control systems.

IR Windows are UL Rec-

ognized instead of UL Listed

because IR Windows serve no

real purpose by themselves.

They need to be installed into

an electrical enclosure, or onto

something, to be used for their

intended purpose. All Fluke IR

Windows are tested to meet

the UL50V Infrared Viewport

Standard. This standard outlines

the necessary testing criteria to

achieve UL Recognition.

To further this point, let’s

take a look at how electrical

switchgear manufacturers use IR

Windows.

A switchgear manufacturer

has various types of UL Listed

switchgear. In order to maintain

that UL Listing, the IR Window is

added to the switchgear manu-

facturer’s UL Listing or file as a

©2012 Fluke Corporation. Specifications subject to change without notice.

Printed in U.S.A. 3/2012 4161283A A-EN-N

Modification of this document is not permitted without written permission

from Fluke Corporation.

Fluke. Not just infrared. Infrared you can use.

™

UL Recognized component. This

allows the manufacturer to install

IR Windows into their switchgear

during assembly, prior to delivery

to the customer without violating

their UL Listing. As long as the

IR Window is installed according

to the IR Window manufacturer’s

instructions (instructions that

are approved by UL during the

UL50V testing), the UL Listing of

the switchgear is maintained.

Sources:

General: www.ul.com