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TESTING & MEASUREMENT
TRUSTED
SINCE
1862
USA
CANADA
INT’L
FAX
800.451.2632
FAX
800.524.2853
FAX
+1.815.397.9247
PHONE
800.435.0786
PHONE
866.384.8813
PHONE
+1.815.397.7070
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 or other circuits that are not
directly connected to the utility mains.
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 ETL –
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.