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Greenlee FAQ

Meeting today’s stringent safety standards is essential.
Greenlee’s certification of selected instruments to both the most recent IEC and UL requirements brings you assurance of the highest level of protection currently available.

What you should know about Measurement Category ratings.

IEC Category standards specify protection levels that are far above a system’s rated capacity. Without this additional protection, transient overvoltages, which are becoming increasingly common, can lead to serious injury or death.

Measurement Category I is the signal level for telecommunications and electronic equipment.

Measurement Category II
is the local level for fixed or nonfixed powered devices – everything from lighting to appliances to office equipment such as copiers. May also be used in Category I areas.

Measurement Category III
is the distribution level – fixed primary feeders or branch circuits. These circuits are usually separated
from Category IV (whether utility service or other high-voltage source) by a minimum of one level of transformer isolation. May also be used in Category II and Category I areas.

Measurement Category IV
is the primary supply level. Greenlee is leading the way in offering protection certified to conform with the highest level of protection as specified by UL & IEC standards. May be used in all Category environments.

Greenlee Instruments
– Independently tested and certified to meet the standards.

Throughout this catalog, you’ll see Category designations for many Greenlee instruments indicating that they comply with UL & IEC
Category II, III, IV. All of these designations reflect third-party testing by independent testing organizations such as UL and TUV – added assurance for you. While there is no requirement for independent verification, we believe you deserve it.

Get the right protection for the job.

Wherever you need overvoltage protection, choose at least the rating appropriate to the type of work you expect to be doing. If you have any questions on using Greenlee test instruments to help ensure user safety, please contact Greenlee.

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