UFC 3 -520-01
June 10, 2002
11-3.4.8 For surge protectors with visual indications of proper operation (indicating
lights), verify that the surge protector displays normal operating characteristics.
11-3.4.9 Record the date of installation.
Periodic Maintenance. Ensure periodic maintenance is assigned to perform
checks of installed surge protectors in accordance with Section 7.19 of NETA MTS,
Maintenance Testing Specifications for Electrical Power Distribution Equipment and
The following systems, including related systems, should have surge
Fire alarm systems .
Computer data circuits.
Coaxial cable systems.
Electronic equipment data lines.
Electrical power to the above equipment should be protected against surge
transients in accordance with the criteria provided in the previous sections.
systems is listed with UL 497A, Standard for Secondary Protectors for Communication
, or UL 497B, Standard for Protectors for Data Communication and Fire Alarm
Circuits, as applicable.
Ensure telephone communication interface circuit protection is listed to UL
497A and it should provide a minimum surge current rating of 9,000 amperes. Ensure
central office telephone line protection is listed to UL 497A and it should have multi -
stage protection with a minimum surge current rating of 4,000 amperes.