2
Following are some typical situations where the Chance
E
qui-Mat
™
Protective Grounding Grid can be used for personnel
protection. Each individual situation must be evaluated for proper installation and work technique before work begins. If
questions arise about any particular situation, please contact Hubbell Power Systems / Chance with all available informa-
tion for recommendations.
Several of these grids may be connected together to cover large or irregular shaped areas. Refer to page 3 for typical con-
figurations. Use the supplied bolt, lock washer, and nut to connect the lug terminal together as shown in the illustration.
The terminals and hardware must be clean and tight to ensure an adequate connection.
TYPICAL USE SITUATIONS
NOTICE: Bolt torque - 400 in./lb. (33 ft./lb.) - 482 N/m.
•
Bucket trucks, digger derricks, cranes, cement pumpers, etc.
Properly attach the vehicle to the electrical system neutral or ground, or to a driven ground. Connect the
E
qui
M
at
™
Protective Ground Grid to the vehicle at the same ground point as the vehicle ground cable.
•
Stringing equipment, boring machines, excavating equipment, URD cable fault locators (thumper), etc.
Properly attach the equipment to the electrical system neutral or ground or to a driven ground.
Connect the
E
qui-Mat
™
Protective Grounding Grid to the vehicle at the same ground point as the equipment ground
cable.
•
Overhead switches, communication towers, control boxes, etc.
Connect the switch operator mechanism, or the equipment to be used at the base of the tower to the system ground
point (if available) or to a driven ground. Connect the
E
qui-Mat
™
Protective Grounding Grid to the switch operator
or equipment being used. The grid will now be a parallel path with the system ground in the event the equipment or
tower becomes energized.
•
Pipeline welders and installers.
Connect the pipe to a driven ground rod with an adequately sized ground cable. Connect the
E
qui-Mat
™
Protective
Grounding Grid to the driven ground rod. This will help equalize the electrical potential between the pipe and ground
should the pipe become energized.
•
Substations (permanent and portable), portable generators.
The
E
qui-Mat
™
Protective Grounding Grid will supplement the grid system in substations if corrosion has reduced its
effectiveness.
Connect the grid to the ground connection of the substation.
The
E
qui-Mat
™
Protective Grounding Grid can provide personnel protection around portable generators that may not
be adequately grounded. If the frame of the generator is at an elevated voltage, the grid can prevent shock when touch-
ing the frame. Connect the grid to the frame or ground lug of the equipment.
•
Metal enclosed switch gear, circuit breakers, etc. DE-ENERGIZED and GROUNDED.
Properly ground the equipment to the electrical system neutral or ground, or to a driven ground. Connect the
E
qui-
Mat
™
Protective Grounding Grid to the same ground point as the equipment.
USE OF THIS GRID FOR URD CABLE SPLICING. Attaching the grid to an energized conductor will
result in the worker being in the path to ground. The grid should only be attached to a URD cable
after the cable is verified to be de-energized and properly grounded at both sides
of the cable splice.
DO NOT energize the URD cable while the grid is attached. This will result in severe electrical shock
injury or death by electrocution.
DO NOT USE THIS GRID FOR
ENERGIZED
METAL CLAD SWITCH GEAR. Working on or operat-
ing metal clad switch gear that is energized while standing on this grid presents a danger to the
worker if they make contact with an energized component. Since the grid is solidly grounded, the
path to ground will be directly through the worker.
Failure to follow this warning will result in severe electrical shock injury or death by electrocution.
▲
!
DANGER
This grid may become slippery when wet, frosty, or used on snow covered ground. Under these
conditions, place the grid side up and secure the corners with plastic tent pegs. DO NOT USE METAL
PEGS. Failure to follow this caution may result in injury from a fall.
▲
!
CAUTION