LT panel meaning — what it is, where it is used, and what to check
An LT panel distributes low-voltage power (typically 415V 3-phase) from the transformer/DG to feeders like HVAC, lifts, lighting and pumps. Audits focus on protection, cable sizing, earthing, metering and thermal hotspots.
What is an LT panel (low tension panel)?
LT stands for Low Tension (low voltage). The LT panel is the main electrical distribution panel that houses the incomer breaker, busbars, outgoing feeders and metering at 415V/240V.
Typical LT panel components
- —Incomer: ACB/MCCB with protection settings
- —Busbar chamber and neutral busbar
- —Outgoing feeders: MCCB/MCB/contactor starters
- —Energy meters: kWh, kVAh, PF, demand, harmonics (if smart)
- —Surge protection device (SPD) and earthing
5 checks during an energy audit
- —Thermal scan for hotspots (loose lugs, imbalanced phases).
- —Power factor and kVAh billing impact at incomer.
- —Phase imbalance and neutral current.
- —Breaker coordination and protection settings.
- —Metering coverage (which feeders are measured).
Frequently asked questions
A DB is a small distribution board (often per floor/area). The LT panel is the main/large distribution assembly feeding multiple DBs and heavy loads.
Commonly 415V 3-phase (line-line) and 230–240V single-phase (line-neutral) for building distribution.
The incomer meter often determines kVAh/PF/demand readings that drive your tariff charges and penalties.