To safeguard telecommunication lines, transient suppression products for example 3 mil carbon blocks (IEEE C62.32), ultra-low capacitance varistor metal oxide , and avalanche diodes are
utilized. For greater wavelengths, for example
radio communication equipment, a gas discharge tube (GDT) might
be utilized.[citation needed] An average surge protector power strip is made using xatge MOV . Low-cost versions could
use just one varistor, in the hot (live, active) towards the neutral conductor. A
much better protector consists of a minimum of three varistors one across each one
of the three pairs of conductors. Within
the U . s . States, an electrical strip protector must
have an Underwriters Laboratories
(UL) 1449 3rd edition approval to ensure that catastrophic MOV failure doesn't produce a fire hazard.
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