Thursday, September 17, 2015



You might be wondering how to go about calculating the number of fittings for each room
The formula used is given as:
N =(E * A)/(Ø * UF * MF)
Ø: is the luminous flux emitted by the lamp chosen and its value is provided by the Manufacturer;
N: is the number of required lamp
E: is the illuminance level chosen based on IESNA recommendations;
A: is the area of the space to be lit;
M.F: is the maintenance factor (given by the lamp manufacturer usually 0.8 - 0.9 );
U.F: is the coefficient of utilization (is a ratio of utilized flux to the total flux emitted and is determined by the lighting scheme adopted, given by the luminaire manufacturer in their photometric data after calculating the room index).

Wednesday, September 16, 2015



Customer is the key person in determining the final arrangement. BS 7671 (the Wiring Regulations) will often recommends that a project should be discussed with the client.

IEEE regulation will be strictly adhere to for designs. the software used in this blog is  the AUTO-CAD software. 
Note: The lumen method of lighting calculation is used for this project.

What The Lumen Method Is All About
  After calculating the number of light fitting in each room. its was then placed appropriately in each of the rooms.


1. Lights should be placed at positions where it will be evenly distributed.
2. The distance of a light fitting from the wall should be approximately halve the distance between two light fittings

will continue on the next post...........



Distribution is done with the aid transmission and distribution networks which transmit electrical power at various voltages. Such distribution networks can be either overhead or underground. Power Holding Company of Nigeria (PHCN) is the agency of the government responsible for generation, transmission and distribution of electricity in Nigeria This Center controls every other transmission and power station linked to the grid in the country In Nigeria, after electrical power is generated by a power station at voltage of 16000V (16KV) .  The electrical energy generated is then stepped up by a step up transformer to a voltage level of 330000V (330KV) for transmission. It is more desirable to transmit electrical energy at very high voltage and low current level because doing this minimizes losses in transmission. The transfer of electrical energy at such a high voltage level is usually referred to as transmission. This voltage level is reduced at sub-transmission stations to 132000V (132KV) for sub-transmission. It is further stepped down to 33000V (33KV) at sub stations. Large industries and some customers are fed at this voltage level. The electrical energy is further stepped down to a voltage level of 11000V (11KV) for supply to distribution sub-stations. General consumers are fed from distribution sub-stations at a voltage level of 415/230V.

PLEASE  NOTE:   Most of the the illustration that i will use will be of my home country, but same is applicable for any country too.


Universities this days do not teach students properly how to make electrical building drawing. This platform will be use  to educate students on the basics of electrical service designs.
New post will be coming in every week, but i will always be available to answer any question you have....