Xerox 4219/MRP Operator's Manual page 5

NOTICES
Always use materials and supplies specifically designed for your
Xerox equipment.
WARNING: Use of unsuitable materials may result in poor
performance and can possibly create a hazardous condition.
Always use a Xerox specified cordset with the Equipment Leakage
Circuit Interrupter/Residual Current Device (ELCI/RCD).
Use caution when installing or modifying telephone lines.
Do not do this
Never use an extension cord with the ELCI/RCD.
Never use the ELCI/RCD where water may enter the casing.