Weathermatic SmartWire 9600TW, Owner'S Manual

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4.0 Lightning Protection
• Use only DBY or DBR 3M Type waterproof connectors
encapsulating a twisted wire connection inside (SLCONN
included).
• For maximum protection, place an SLGDT every 600 feet
along the 2-wire system. (Example 1 in graphic on previous
page.)
• One SLGDT should be within 25 of the host SmartLine®
controller. (Example 2 on previous page.)
• A single stub line must not exceed 50 feet without an SLGDT
lightning arrestor. (Example 3 on previous page.)
• An SLGDT lightning arrestor must also be placed at the end
of the 2-wire run that is the maximum distance from the
SmartLine® controller, or if looped, at the point of maximum
distance from the SmartLine® controller. (Example 4 on
previous page.)
4.4 Grounding Requirements
• The GREEN ground wire must be attached to a #8 solid bare
copper wire using the included SLCONN wire connector.
Connect the bare ground wire to a grounding circuit with 12
Ohms or less resistance to earth ground, measured with a
ground resistance meter or Megger.
• A grounding circuit is comprised of 4 major components:
o Ground Rod(s) and/or Plate(s).
o Ground Conductor.
o Exothermic or Cadmium Weld connections.
o Soil and/or Ground Enhancement Materials.
• Ground Rods/Plates must be installed in a 6” min. valve
box, 6” below grade or below frost line, located within an
irrigated zone to maintain soil moisture and maximum ground
performance.
• Ground Rods shall be UL listed “copper clad”, 5/8” minimum
diameter, 8’ of length, and must meet the requirements of
NEC article 250-52(c).
• Ground Plates shall be a copper alloy specifically intended for
grounding, with a minimum thickness of 0.060”. Each plate
shall expose a minimum of 5 square feet of surface area to
contact the soil, and meet the requirements of NEC article
250-52(d).
• Grounding Conductor shall be a solid, bare copper wire
or strap used to connect the green ground wire to the
ground rod or plate, sized appropriately to achieve specified
resistance.
• Exothermic or Cadmium Weld products such as CADWELD
One Shot ®, shall be used to connect the #8 AWG bare
copper ground conductor to the ground rod or plate.
• Ground Enhancement Materials such as Powerset®, PowerFill®,
and GEM® shall be used as required to achieve specified
resistance to earth ground.
• Local soil and site conditions will dictate what extent of
grounding measures will be required. Generally there are 3
soil types that each require different methods and equipment
to achieve the 12 Ohm minimum resistance to ground:
o Clay soils: A single ground rod is typically sufficient, located
in an irrigated zone, with CADWELD connections and no
soil amendments. Some sites require a 6” diameter hole
to be augured and backfilled with Ground Enhancement
Materials.