Echelon FT 3150 Smart Transceiver - Manual (Page 109)

FT 3120 / FT 3150 Smart Transceiver Data Book 103
Lightning Protection
Shield Protection
Gas Discharge, MOV, or TVS devices may be used for the shield-to-ground protection. MOV and TVS devices
may not be used to protect the network data lines.
Suggested Gas Discharge Arresters
Three-electrode device configurations are suggested for the data network lines, as this will require the use of only
one physical device to protect both lines. The network lines should be connected to the two outside ends of the
arrester, while the middle terminal must be connected to a stable earth ground. Alternatively, two each of two-
electrode configurations may be used (contact manufacturer for details). The following table provides a list of
three-electrode Gas Discharge device manufacturers.
* Manufactures of Suggested Gas Discharge Arresters
Figure 4.8 illustrates a typical outdoor twisted pair network in which Gas Discharge arresters have been
incorporated.
Figure 4.8 Network and Shield Lightning Protection
Vendor and Configuration Series Model Voltage
Sankosha, 3 Electrode
www.sankosha-usa.com/cp6htm 3YW A 90VDC
Citel, 3 Electrode
www.citelprotection.com BT (or BTR) ---- 90VDC
Sumida, 3 Electrode
www.srcdevices.com PMT8 ---- 90VDC
Outside
Shielded Twisted Pair
Inside
Building Wall
Lightning
Protector
Gas Discharge
Surge Protectors
(Typically <5pF)
Net A
Net B Shield