Safety Yamatake Corporation
16 ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
e) Rod and pipe electrodes. Not less than 8 ft (2.44 m) in length, consisting of the
following materials, and being installed in the following manner:
• Electrodes of pipe or conduit shall not be smaller than 3/4 inch trade size and,
where of iron or steel, shall have the outer surface galvanized or otherwise
metalcoated for corrosion protection.
• Electrodes of rods of iron or steel shall be at least 5/8 inch (15.87 mm) in
diameter. Stainless steel rods less than 5/8 inch (15.87 mm) in diameter, non-
ferrous rods, or their equivalent shall not be less than 1/2 inch (12.7 mm) in
diameter.
• The electrode shall be installed such that at least 8 ft (2.44 m) of length is in
contact with the soil. It shall be driven to a depth of not less than 8 ft (2.44
m).
f) Plate electrodes. Each plate electrode shall expose not less than 2 sq ft (0.186
sq m) of surface to exterior soil. Electrodes of iron or steel plates shall be at
least 1/4 inch (6.35 mm) in thickness. Electrodes of non-ferrous metal shall be
at least 0.06 inch (1.52 mm) in thickness.
A single electrode consisting of a rod, pipe, or plate that does not have a resis-
tance to ground of 25W or less shall be augmented by one additional electrode of any
of the types specified in a) to f). Where multiple rod, pipe, or plate electrodes are
installed, they shall not be less than 6 ft (1.83 m) apart.
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