485ELC View Datasheet(PDF) - ProTek Devices.
Part Name
Description
MFG CO.
'485ELC' PDF : 5 Pages View PDF
Only One Name Means ProTek’Tion™
package information
485ELC
installation instructions & DIAGRAM
This product should be located as close as possible to the equipment being protected. A low impedance grounding system is important to maintain a low clamping
voltage between the line-to-ground connection.
There are five (5) terminals on both the line and equipment side of the 485ELC - four data line terminals and two ground terminals. Both ground terminals, as shown
on the label, are connected internally. A single ground connection is sufficient. However, it is recommended that both ground connections be used for a lower imped-
ance path to earth. This connection can be made through the green AC power ground wire or a known earth ground. The ground wire should be #14 stranded wire.
Incoming data lines are cut or disconnected from the equipment to insert the 485ELC product. The line side of the terminals are to be connected to data lines from
the outside world or lines that carry the transient threats into the equipment to be protected. The equipment side of the terminals are to be connected to the equip-
ment to be protected . The location of the product should be such that these wires are as short as possible. A #18 or 20 gauge wire can be used for these connec-
tions.
ProTek’s data line protector is designed with a short circuit failure mode to give maximum protection. A fuse, fusible link, or circuit breaker is recommended for each
data/signal line on the input (line) side of the protector for those applications that require an open circuit failure mode.
Caution: A low DC resistance ground may not be indicative of a good lightning ground. Lightning contains a broad spectrum of frequencies - up to 1 MHz. A low
impedance path to ground at the transient frequencies is necessary. A ground strap is recommended or a #6 AWG stranded wire. For wire lengths over 1.5 meters,
there may be some excessive line to earth potential under severe thunderstorm conditions. For these applications, an additional protector may be necessary at the
equipment interface.
UNPROTECTED SIDE
1
2
GND
3
4
PROTECTED SIDE
1
2
GND
3
4
Earth Ground
Note: Both ground terminals are common. Use second ground wire
to reduce impedance on long runs to earth ground connections.
Earth Ground
05039.R5 9/12
Page 3
www.protekdevices.com
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