24 free calculators for LT/HT customers: load and maximum demand, LT vs HT, bills, transformer, cable size, voltage drop, fault level, PF correction, earthing, solar and more.
Add up your loads to find connected load, maximum demand, and whether you need LT or HT supply.
Compare a year of bills on LT and HT tariffs, add the substation cost, and see the payback.
Estimate a monthly bill for HT or LT industrial and commercial connections, with ToD and PF effects.
Enter 12 months of recorded demand to find the contract demand with the lowest yearly demand charges.
The steps, documents, typical time and indicative cost for a new HT service in Tamil Nadu.
From your load, diversity and growth to the next standard transformer rating and its loading.
Compare transformer offers on price plus the cost of their losses over the years.
Running load plus the starting of your largest motor gives the DG rating and fuel use.
UPS rating and battery capacity for the load and backup time you need.
System size from your consumption and roof, yearly generation, savings and payback.
How much demand your chargers add, and whether your connection needs an upgrade.
Pick a cable size with derating, then check voltage drop and short-circuit withstand.
Voltage drop for a cable, current, length and power factor, against the allowed limit.
Short-circuit current at the transformer and at your panel, and the breaker breaking capacity you need.
MCB, MCCB, ACB or VCB rating and breaking capacity for a load or feeder.
Full-load current, suitable starter, starting current and cable for a three-phase motor.
kVAR needed to reach your target power factor, APFC steps, and what you save.
Risk of harmonic problems from VFDs, UPS, LED and EV chargers, and what to do next.
LED retrofit, VFDs on pumps and fans, and efficient motors: kWh, rupees, payback and CO₂.
Resistance of one earth electrode, how many pits you need, and the conductor size.
Does your building need a lightning protection system? A quick risk score and a starting class.
How many fixtures a room needs for the right light level, and the lighting power density.
Convert between kW, kVA, HP and amps for single and three phase supplies.
What to keep ready for a new LT or HT service, load change, CEIG approval or name transfer.