Electrical Services Report: Commercial Building Electrical Design

This report presents the electrical services design for a six-level commercial building, detailing the load calculations, power distribution, and lighting plans. The report begins with an introduction to the building's layout, including areas like parking, storage, and lettable spaces. It then provides a breakdown of power equipment and light fixtures used in different areas, followed by load calculations to determine the apparent power (kVA) considering a demand factor. The report calculates the power requirements for lighting, mechanical ventilation, and various electrical outlets. Furthermore, it analyses the load distribution across different floors and phases, supported by schematics and layouts for the ground floor and other levels. The report also considers the use of LED lighting for energy saving and includes references to relevant sources.

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[Electrical services]
[Name]
[Professor]
[Course]
[Date]

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Introduction
The building is a commercial building covering an area of 1478ft2. This building
comprises of 6 levels, where there are two basements, (mainly used for parking), a ground floor, and
three more levels above the ground floor. Apart from the parking areas in the basements, the other
spaces are lettable spaces with specific locations for kitchenette, storage areas, toilets (for gents and
ladies) and one for the persons living with disability, and a community centre. With the mantra of
saving power (Khatri, 2016), the design, and installation shall adopt the LED system. On power
installation, there shall be outlets for air conditioning system and the same shall be considered in the
load calculation, the same as the basement where the water pump shall be installed to pump water
from the underground tank, as well as the mechanical ventilation, to condition the air in the basement
at the same time drive away the fumes. Table 1 shows the specific light fixtures and equipment used
at different areas of the building. After the determination of what goes in where, what is installed
where, the load requirement is then taken into consideration with an aim of determining the apparent
power or (kVA), different from Kilowatt (kW) (Power Electronics, 2015). The kVA is determined
after considering the demand factor, see Table 2, which is what is utilized in the building (Jignesh,
2011), in our case, the demand factor is 70%. This is the power that can be used in cable sizing and
back-up power consideration.
Load break down
Table 1:Power equipment and light fixtures at different areas of the building
Floor Areas Lighting Power
Basement 1 Parking space
27 double batten 4ft 36W Fluorescent
light T8 Mechanical Ventilation 8x 1kW
Store 1 and 2 5 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 2
Storage 1 and 2 4 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 2
Ramp 5W LED recessed ramp lights
Stair case 1 and 2 4 x 15W Standard LED Light
Basement 2 Parking space
27 double batten 4ft 36W Fluorescent
light T8 Mechanical Ventilation 8x 1kW
Storage services 2 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 3
Storage 4 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 3
Ramp 5W LED recessed ramp lights

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Stair case 1 and 2 4 x 15W Standard LED Light
Ground
Floor Tenancy 1 12 x 23W Standard LED Light 2 x 10 A socket (Double GPO) = 3
Tenancy 2 15 x 23W Standard LED Light 2 x 10 A socket (Double GPO) = 4
Tenancy 3 13 x 23W Standard LED Light 2 x 10 A socket (Double GPO) = 4
Common areas and
lobbies 14 x 40W Downlight
2 x 15W Standard LED Light
Tenancy 4 1 x 3W Emergency Exit lights 4 x 20 kW Air-Conditioning Unit
11 x 44W Core view 2 lights
2 x 10 A socket (Double GPO) =
10
25 x 40W Downlights
Tenancy 5 1 x 3W Emergency Exit lights 4 x 20 kW Air-Conditioning Unit
11 x 44W Core view 2 lights
2 x 10 A socket (Double GPO) =
10
25 x 40W Downlights
Community Centre 25 x 40W Downlights 3 x 20 kW Air-Conditioning Unit
1 x 3W Emergency Exit lights 2 x 10 A socket (Double GPO) = 4
Stores 3 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 2
Retail 6 x 40W Downlights 3 x 20 kW Air-Conditioning Unit
2 x 10 A socket (Double GPO) = 2
Ladies toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Gents toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Disabled toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Kitchenette 3 x 40W Downlights 2 x 10 A socket (Double GPO) = 2
Level 1 Tenancy 1 x 3W Emergency Exit lights 4 x 20 kW Air-Conditioning Unit
11 x 44W Core view 2 lights
2 x 10 A socket (Double GPO) =
10
25 x 40W Downlights
Terrace 16 x 40W Downlight
Store 3 x 4ft 15W Fluorescent light 1 x 10 A socket (Double GPO) = 2
Gents Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Ladies Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights

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Disabled toilets 1 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
2 x 3W LED mirror lights
Common areas 14 x 40W Downlight
2 x 15W Standard LED Light
Level 2 Tenancy 3 x 3W Emergency Exit lights 4 x 20 kW Air-Conditioning Unit
16 x 44W Core view lights
2 x 10 A socket (Double GPO) =
10
19 x 40W Downlights
Terrace 16 x 40W Downlight
Gents Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Ladies Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Disabled toilets 1 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
3 x 3W LED mirror lights
Common areas 15 x 40W Downlight
5 x 15W Standard LED Light
Level 3 Tenancy 3 x 3W Emergency Exit lights 4 x 20 kW Air-Conditioning Unit
39 x 44W Core view lights
2 x 10 A socket (Double GPO) =
10
21 x 40W Downlights
Gents Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Ladies Toilets 6 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
8 x 3W LED mirror lights
Disabled toilet 1 x 21W LED Downlight Weatherproof 1 x2.2 kW Hand dryer
2 x 3W LED mirror lights
Common area 15 x 40W Downlight
5 x 15W Standard LED Light

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Table 2: Load calculation and determination of kVA
Floor Elec. Type Watts kW Power
factor kVA Demand
factor (DF)
kVA after
DF
Basement 1 Lighting 1,172.00
Power 9,200.00
Total 10,372.00 10.37 0.8 12.97 0.7 9.08
Basement 2 Lighting 1,127.00 -
Power 13,800.00 -
Total 14,927.00 14.93 0.8 18.66 0.7 13.06
Ground Lighting 6,302.00 -
Power 339,500.00 -
Total 345,802.00 345.80 0.8 432.25 0.7 302.58
Level 1 Lighting 3,089.00 -
Power 155,600.00 -
Total 158,689.00 158.69 0.8 198.36 0.7 138.85
Level 2 Lighting 3,112.00 -
Power 109,600.00 -
Total 112,712.00 112.71 0.8 140.89 0.7 98.62
Level 3 Lighting 3,567.00 -
Power 109,600.00 -
Total 113,167.00 113.17 0.8 141.46 0.7 99.02
Common
areas Lifts 17,000.00 -
Water Pump 6,000.00 -
Mechanical
Ventilation 16,000.00 -
Miscellaneous 4,500.00 -
Total 43,500.00 43.50 0.8 54.38 0.7 38.06
Total 799.17 998.96 699.27

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Number #2
When calculating the loadings of the office spaces, we have to consider what each load
has in terms of power, while doing this we must know that we are using a 3-phase system, so there are
some load that will be connected to a single phase, like the sockets, the hand dryer, the lights etc, but
the HVAC or air conditioning, shall use all the three phases, so we shall consider a HVAC system that
is rated 3-phase, see table 3. After this, we are able to determine the loadings, which has been
displayed on the schematic, such that we know that each phase carries what amount of load, shown in
the figure 1.
Watts kW kVA
Ground floor Lights 6,302.00 6.30 7.88
HD 6,600.00 6.60 8.25
Sockets 46,000.00 46.00 57.50
AC 280,000.00 280.00 350.00
- -
Level 1 Lights 3,089.00 3.09 3.86
HD 6,600.00 6.60 8.25
Sockets 27,600.00 27.60 34.50
AC 80,000.00 80.00 100.00
- -
Level 2 Lights 3,112.00 3.11 3.89
HD 6,600.00 6.60 8.25
Sockets 23,000.00 23.00 28.75
AC 80,000.00 80.00 100.00
- -
Level 3 Lights 3,567.00 3.57 4.46
HD 6,600.00 6.60 8.25
Sockets 23,000.00 23.00 28.75
AC 80,000.00 80.00 100.00

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Figure 1:Schematic for the building (only the office spaces)
Since this is an office space and not an already partitioned space, meaning there’re no work going on,
so the load requirements have to be predictive. The distribution boards have to be installed at the
spaces so that whenever a tenant comes, they are able to tap from them and get their power for
whatever business they will have. The blue markings on the screen shot drawings are the distribution
boards and the red one is the MSB since it must be located at a duct. But each floor shall have a sub-
board where the distribution boards will feed from. It is important to note that the fixture like light,
HVAC, sockets and so on, shall have circuit breakers that connects them from the distribution boards.

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Figure 2: Ground floor power layout

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Figure 3: :Level 1 power layout

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Figure 4: Level 2 Power layout

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Figure 5: Level 3 power layout

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Figure 6:Ground floor lighting