Where should EOL resistors be installed?
What makes EOL resistors so important is that they can supervise the wires only when they are at the end of the line. When properly placed in the circuit, EOL resistors prevent wire tampering on normal switches. EOL resistors in the control panel are usually ineffective. The usual net effect of putting the EOL resistors in the panel is that the panel acts as if it has no EOL resistors. Even open circuit devices like smoke detectors and hold-up buttons are not properly supervised when the EOL resistor is attached in the panel before the end of the line.
