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SEL-787 Relay Instruction Manual Date Code 20150130
Preface
General Information
Environmental
Conditions and
Voltage Information
The following table lists important environmental and voltage information.
Wire Sizes and
Insulation
Wire sizes for grounding (earthing), current, voltage, and contact connections
are dictated by the terminal blocks and expected load currents. You may use
the following table as a guide in selecting wire sizes.
Instructions for
Cleaning and
Decontamination
Use a mild soap or detergent solution and a damp cloth to carefully clean the
SEL-787 chassis when necessary. Avoid using abrasive materials, polishing
compounds, and harsh chemical solvents (such as xylene or acetone) on any
surface of the relay.
Technical Assistance
Obtain technical assistance from the following address:
Schweitzer Engineering Laboratories, Inc.
2350 NE Hopkins Court
Pullman, WA 99163-5603 U.S.A.
Phone: +1.509.332.1890
Fax: +1.509.332.7990
Internet: www.selinc.com or selindustrial.com
E-mail: info@selinc.com
Condition Range/Description
Indoor/outdoor use Indoor
Altitude
(Consult the factory for derating speci-
fications for higher altitude applica-
tions)
To 2000 m
Temperature
IEC Performance Rating
(per IEC/EN 60068-2-1
and IEC/EN 60068-2-2)
–40 to +85°C
Relative humidity 5 to 95%
Main supply voltage fluctuations To ±10% of nominal voltage
Overvoltage Category II
Pollution Degree 2
Atmospheric pressure 80 to 110 kPa
Connection Type Minimum Wire Size Maximum Wire Size
Grounding (Earthing) Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Current Connection 16 AWG (1.3 mm
2
) 12 AWG (3.3 mm
2
)
Potential (Voltage) Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Contact I/O 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Other Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Use of this equipment in a manner
other than specified in this manual
can impair operator safety safeguards
provided by this equipment.
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