GROUNDING THE MACHINE
- WARNING -
Improper grounding of the machine could result in damage to the control and se
-
vere electrical shock to personnel in the event of an electrical fault. To properly
ground the machine, a supplemental earth ground is recommended.
The minimum ground wire size for all machines is 8 AWG.
- NOTE -
If a supplemental earth ground is to be installed, the customer must supply and
install the ground rod, ground rod clamp, and ground conductor according to all
applicable electrical codes.
All electrical components should have the same reference base to assure that voltage potential, in
the event of circuit shorts or other malfunctions, is limited. This is accomplished by having a neutral
reference wire common to all voltage sources within the system.
Since safety requirements vary with locality, consult local codes that will take precedence over the
following guidelines.
SUPPLEMENTAL EARTH GROUND
Earth ground connections in their order of effectiveness are as follows:
1. Effectiveness of continuous water pipe when properly buried will depend on conditions of soil.
When installed below permanent moisture level, the impedance of this type of ground is
typically below 3 OHMS.
2. Effectiveness of man-made, driven or buried electrodes will depend on condition of soil. When
installed below permanent moisture level, the impedance of this type of ground is typically
below 5 OHMS.
3. Other available electrodes, such as metal frames of buildings or metal well castings must be
well chosen, since they are substantially below 25 OHMS, but exceed 5 OHMS.
Ground connections, wires, and electrodes should not exceed 5 OHMS, as measured from the
equipment ground stud through the primary electrode through earth, to another independent elec
-
trode separated by 20 feet of earth. Additional grounding should be installed when necessary, to in
-
sure that the impedance does not exceed 5 OHMS.
1-34 M-507C
To Next Page
Loading...
