equipment ground การใช้

• In older houses, the receptacle could be in place but not wired to an equipment ground.
• Older houses may not have that equipment ground.
• This new wire was called the equipment ground, and it became a standard feature on all residential wiring.
• If there are no equipment ground circuits the old receptacles should ideally be replaced with properly grounded receptacles.
• What he did was to swap hot ( red ) and equipment ground ( green ) in some 480 volt extension cords.
• A severe risk of electric shock occurs when equipment grounds are improperly removed in an attempt to cure the problems thought to be caused by ground loops.
• Shortly after this, I was working as an electrician at International Exposition Center and had to check the equipment grounds in a bunch of 480 volt extension cords.
• In such cases the receptacles must be labeled " no equipment ground " and " GFCI protected "; GFCI manufacturers typically provide tags for the appropriate installation description.
• For the purpose of protecting humans against electric shocks, the National Electrical Code permits such replacement if the installer marks the GFCI as having " No Equipment Ground ".
• In building wiring, a "'bootleg ground "'is an electrical GFCI and leave the grounding terminal screw unconnected, then place a label that says " No Equipment Ground " on the GFCI and a marking that states  GFCI Protected and  No Equipment Ground on all downstream receptacles.
• It is theoretically possible for a color vision impaired electrician to get a license-one of my buddies had a white electrician ( as an employee ) for 6 or 7 years until this white electrician accidentally swapped a black hot wire and a green equipment ground and nearly killed himself and several other people.