domains / families / science / eol-resistor-calculator
eol-resistor-calculator
authentic
Calculates and validates end-of-line (EOL, SEOL, DEOL, TEOL) resistor loops for intrusion alarm panels (Honeywell, DSC, Paradox, Bosch) with wire gauge drop and state tables. Trigger phrases: eol resistor, deol wiring, alarm zone resistor, calculate end of line, double eol tamper.
When to use
- Sizing, retrofitting, or diagnosing hardwired security loops on alarm panels (DSC PowerSeries/Neo, Honeywell Ademco Vista, Paradox EVO/Spectra, Bosch B/G Series, Texecom Premier Elite).
- The user asks: "How do I wire double EOL on a DSC panel?", "Calculate zone loop resistance for a 200m cable run", "Troubleshoot a constant zone tamper fault", or "What resistor values does Honeywell Vista use?".
- Differentiating between Normal, Alarm, Tamper (Short), and Cut (Open) circuit states across varying panel threshold windows.
- Sizing copper loop resistance drops on long perimeter runs (e.g. 22 AWG over 150+ meters) to prevent phantom false alarms.
- Designing wireless sensors or addressable polling loop multiplexers (polling loops use digital transponders, not passive EOL resistors).
- Bypassing safety or life-safety supervision circuits (never advise strapping out resistors or bypassing line supervision).
- Working on 2-wire smoke detector loops without consulting panel-specific smoke circuit polarity and current-limiting specs.
When not to use
- EOL values, wiring topologies, and zone states are panel- and detector-specific. Use the installation manual and approved wiring diagram for the exact model; the examples are not universal specifications.
- Work on alarm systems only with owner authorization and qualified personnel. Do not bypass supervision, disable an active alarm, or leave a protected site without a verified restored state.
- Cable resistance and resistor tolerances are estimates. Measure the installed loop and confirm the panel's published acceptance ranges before changing configuration.
Skill page
Source