Lamp holder rated voltage:
The maximum operating voltage expected by the manufacturer for the light bulb socket.
When the lamp works under normal conditions and the lamp is pulled out of the lamp holder, the highest voltage may occur at either end of the insulator at the lamp holder.
Maximum current expected by the manufacturer for the lamp holder.
Built in lamp holder:
Design and installation of lampholders for luminaires, enclosures, and similar devices.
In order to meet the requirements of electric shock protection for this standard, an internal lamp holder is required to take additional measures (e.g., enclosure).
Its own fully meet the requirements of this standard anti electric shock protection of the internal lampholders
Rated operating temperature:
The highest working temperature of lamp holder design.