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
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
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
Greenlee Instruments – Independently tested and certified to meet the
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
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.