Grain Systems PNEG-119 - Manual (Page 13)

PNEG-119 Inline Centrifugal Fan 13
5. Fan Installation
Figure 5A
Previously Installed Units
It is recommended that previously installed units be checked to see that a machine to earth ground has
been installed by an electrician.
Machine to Earth Ground
It is very important that a machine to earth ground rod be installed at the fan. This is true even if there is
a ground at the pole 15 feet (15') away. This ground needs to be as close to the fan as possible, but no
more than 8 feet (8') away. The ground rod should be connected to the fan control panel with at least a #6
solid bare copper ground wire or in accordance with local requirements. The machine to earth ground
provides additional safety if there is a short. It also provides the grounding necessary for long life and
operation of the solid state.
Cross-sectional area of phase conductors
supplying the equipment S (mm 2 )
Minimum cross-sectional area of the external
protective conductor S (mm 2 )
S<=16 S
16<=S<35 16
S=>35 S÷2
Use a #6 or approved size bare copper ground wire. Install a 5/8" diameter 8' long
copper-clad ground rod, 2' away from the foundation and 1' below the surface of the
ground or in accordance with local requirements.