TUMUSICA

Portable Generators are a reliable source of power in the absence of utility power. They provide electrical power to supply our critical power needs when the utility company is unable to supply us…

UPS stands for Uninterruptible Power Supply. A UPS system is an autonomous source of alternate power that is used to supply sensitive electronic loads such as computer centers, telephone exchanges …

Now that you know how to install and wire a photocell in a lighting installation . The next step would be to know how to determine the current rating of the photocell for a given application so tha…

In three - phase electrical circuits, there is often the need to transform from a Delta configuration to a Star configuration and vice versa. The formulas for making these conversions are detailed b…

A photocell switch is essentially a light dependent resistor, LDR. Its resistance decreases with increasing incident light intensity. They are used in many applications for on-off control especiall…

Working with single phase, three-phase and DC (direct current circuits) and you quickly need to reference formulas for voltage drops and power calculations for a given conductor? The table below pr…

In a balanced three phase systems, the current in the neutral conductor is theoretically zero. However in a practical electrical installation, this is not the case. In fact there is always some cur…

Harmonics are essentially distortions in the electrical power systems. An electrical power system can be represented by a sinusoidal waveform which varies with time. The harmonic with frequency cor…

Below are the characteristics of the common lighting technology in use in different electrical installations. Also stated are their place of application, advantages and disadvantages: …

Power factor is very critical for calculating or measuring the electrical power consumed by an electrical device on an alternating current supply. To be able to determine electrical power on alter…

The selection of batteries for any application is a critical exercise. A number of factors must be considered in selecting the best battery for a particular application. The characteristics of each…

In an electrical installation, determination of voltage drop from the point of supply to the load is very important. Excessive voltage drop on the supply line impacts most electrical equipment but…

Owing to the effect of voltage drop on electrical equipment, determination of the voltage drop of an electrical conductor is very important in helping to predict voltage drop level and ensure t…

An explosive atmosphere is an atmosphere that develops explosively because of an uncontrollable combustion. Explosive atmosphere consists of air and some sort of combustible material such as gas, v…

The following tables list the current in amperes for different KVA values for both single and three phase circuits for 120, 240, 480 and 600V circuits. To get the corresponding value of AMPS for a…