that grounding devise out there is called surge suppressor/protector which will help protect your canopy from power surge. a power surge, or transient voltage, is an increase in voltage significantly above the designated level in a flow of electricity, in this case will be probably caused by lightning. normal household and office wiring in the Philippines, the standard voltage is 220 volts. If the voltage rises way above 220 volts, there is a problem, and a surge suppressor/protector helps to prevent that problem from destroying the device.