Definition & Operational Usage of Parasitic Load
What Is Parasitic Load?
Unintended battery depletion occurring when on-board electronics, such as mobile data terminals and radios, continue to draw current while the apparatus engine is off.
⚠️ Operational Safety Warning:Failing to connect shore power may result in a dead apparatus within hours.
Why Parasitic Load Matters on the Fireground
Prevents catastrophic battery failure during initial dispatch, ensuring units can start immediately.
Relevant NFPA Standards
- NFPA 1010: Standard on Professional Qualifications for Firefighters
- NFPA 1550: Standard for Emergency Responder Health and Safety
Field Procedures & Tactical Steps
- Verify engine shut down.
- Check ammeter for baseline draw.
- Connect auto-eject shoreline.
- Confirm charger indicator is green.
- Log any unusual voltage drops.
Common Context & Application
Commonly addressed by shore power connections at the station.
Frequently Asked Questions about Parasitic Load
What causes it?
Computers and communication gear.
How is it managed?
Using trickle chargers.
Other Names for Parasitic Load
standby loadidle load
Parasitic Load may also appear in training materials, NFPA standards, or department SOPs as: standby load, idle load.
Relevant Tools
Operational calculators related to Parasitic Load:
Category:Fireground Operations
— Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.