ground bar การใช้

• The Ricoh Arena was the first cashless stadium in the United Kingdom, with customers using a prepay smartcard system in the grounds bars and shops.
• This configuration appears to display three violations of the current U . S . National Electric Code : the main panel does not have a grounding conductor ( here it is fed through the subpanel instead ), the connection between the main and subpanel lacks a grounding conductor ( it must have 4 instead of 3 wires ), and the subpanel neutral bar is bonded to the ground bar ( these should be separate bars after the first service disconnect, which in this case is the main panel ).