ok its been a long time since i posted in MTC..topics. Billing:
MERALCO or Any electric cooperative.
1) residential: you pay for the actual power consumption (resistive onl),in kw-hour, meaning you consumed 1000watts in hour hour x the rate (see your meralco bill for the bill details>
2) For commercial users: you will pay for the following:
> Actual power consumed.
> Demand and demand penalties (meaning your contract is 1.5MVA and your actual load at a given time was 1.7MVA, then penalties is imposed.
> Power factor: 0.8 power factor is already penalized.
0.85 status quo, meaning no penalty and no bunos.
0.9 t0 0.95 Pf bunos is awarded, following a standard computation procedure usually stipulated in the contract.
Other topics. single phase and 3 phase power.
> For small power and lighting needs. single phase power is supplied. Its composed of two wires + G,
phase to phas3 220V for MERALCO and phase to neutral for COOPs.
> For large loads, specially those involving motors, 3 phase power is utilized. It's composed of 3 wires plus G.
Advantage of 3 phase vs single phase? 3 phase uses a smaller cable, why? check in google
sample: load is 1000VA..
calculating for Load current in single phase.
For 3 phase:
P=square root of 2 x VI
I-P/1.73 x 220= 2.6Amps
3 phase system has a lower load current, so u can use smaller cables, yon nga lang maging 3 sila.
depende na un sa econimic study ng project.
I hope this helps.