Installation procedure
otee:
N
In the event that safety and operating procedures
do not exist for installing this arrester to, or
removing it from a circuit, we suggest the
following:
•
Select a mounting location as close as possible to the
apparatus that the arrester is to protect. Make the line
lead and ground lead as short as possible.
•
De-energize the electrical system.
•
Connect the ground (earth) lead to the arrester ground
terminal stud. Torque the hex nut to 27 Nm maximum.
•
Install all mounting hardware on the arrester. Torque
the hanger bracket hex nut to 27 Nm. See Figure 2 for
NEMA
®
brackets.
otee:
N
Make the arrester ground connection as short and
direct as possible to a solid, effective, permanent,
low-resistance ground. If the arrester has a ground
lead disconnector, (isolator) the ground lead must
be flexible enough to allow the disconnector to
operate properly.
•
Connect the line lead to the arrester line terminal stud.
Torque the hex nut to 27 Nm maximum.
otee:
N
The standard arrester terminals accommodate
conductor diameters from 4 mm through 11 mm.
•
Re-energize the electrical system.
Field testing
All UltraSIL polymer-housed VariSTAR surge arresters
have passed a complete series of production tests prior
to shipment; therefore, no field testing prior to initial
energization is necessary. Never, even briefly, apply
any power frequency voltage in excess of COV (Uc) as
stamped on the arrester top cap. There are currently no
industry accepted methods for field testing of arresters.
Figure 3. Typical nameplate data.
VARISTAR
®
SURGE ARRESTER
ULTRASIL
™
TYPE UNS-ZNO
IN = 5 kA IEC 60099-4
P.R. = 20 kA sym
ULTRASIL
™
TYPE UHS-ZNO
IN = 10 kA CLASS 1 IEC 60099-4 P.R. = 20 kA sym
VARISTAR
®
SURGE ARRESTER
U___S
RATING
(U )
___kV
MMYY
___kA
MCOV
(U )
___kV
UltraSIL
™
VariSTAR
®
DIST. ARRESTER
UltraSIL Nameplate - Stamped
in Stainless Steel Top Cap
r
c
ULTRASIL
™
TYPE U2R-ZNO
IN = 10 kA CLASS 2 IEC 60099-4 P.R. = 40 kA sym
VARISTAR
®
SURGE ARRESTER
UltraSIL Arrester Auxillary Nameplates
UNS - Normal Duty (5 kA)
UHS - Heavy Duty (10 kA Class 1)
Assembled in
Mexico
ARRESTER
HANGER
BOLT
HEX NUT*
LOCK WASHER
FLAT WASHER
NEMA
®
HANGER
BRACKET
Figure 2. Installation of arrester to NEMA® hanger
bracket.
*Torque requirement of hex nut is 27 Nm max.
WARNING
Before performing any test on an arrester, contact
your Eaton representative. Some test procedures
may damage the arrester externally and/or internally,
making it incapable of protecting the apparatus or the
circuit on which it is installed or shortening its service
life significantly.
2
ULTRASIL POLYMER-HOUSED VARISTAR SURGE ARRESTER IEC 60099-4 INSTALLATION INSTRUCTIONS
MN235005EN February 2016
