electrical design and installation

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EDINSProjectBriefOct23.pdf

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Diploma in Architectural Technology &

Building Services

Diploma in Integrated Facility

Management

Electrical Design and Installation

(EBT2009)

Project (35%)

Electrical Design

1. Objective

The aim of this Project is to carry out an electrical design of a residential unit.

2. Project Brief

2.1 This is an individual project and is worth 35% of the subject marks.

2.2 This Project is break down into two (2) parts. Part 1 is on electrical loads information

gathering and total connected load calculation. Part 2 is on applying diversity factor,

maximum demand calculation and cable sizing.

2.3 You have to use the template provided for the submission of your works.

2.4 Late submission will be penalised as follow:

2.5 The assessment rubric is attached in Annex E for your reference.

3. Part 1 (15%) – Submit online by Week 7

3.1 Draw the layout of your home (living room, kitchen, bedroom/s, toilet, store room,

bomb shelter, etc.) and indicate all the equipment/appliances in the layout plan.

Prepare a legend of all the loads indicated in the layout plan. An example is shown in

Annex A for your reference.

3.2 List down all the electrical equipment/appliances that are in your home together with

the specification, power rating and the quantity using the template provided. An

example is shown in Annex B for your reference.

3.3 Take photos of different parts of the interior of your home showing all the electrical

loads that are listed in the table. Label the electrical loads on the photos accordingly.

Attach all the photos at the back of the report.

3.4 Calculate the power of each load and determine the Total Connected Load of all the

equipment/appliances in your home using the template provided. Show all your

calculation clearly. An example is shown in Annex B for your reference.

3.5 Calculate the load current demand of each load and the total current using the template

provided. Show all your calculation clearly. An example is shown in Annex B for your

reference. You may use 230V as the single-phase voltage for the calculation.

The general formula for determining the load current of a single-phase load is shown

below:

factor Correction Efficiency factor Power Voltage

Power Current 

 =

For motor-driven loads, you may use a power factor of 0.85 and efficiency of 0.9 for

your calculation.

For fluorescent lighting, you have to use a correction factor of 1.25 for your calculation.

4. Part 2 (20%) – Submit online by Week 16

4.1 Indicate the type of final circuit and the diversity factor to be applied for each load

using the template provided. An example is shown in Annex C. The Diversity Table

is attached in Annex D for your reference.

4.2 Apply diversity factor and determine the demand for each load. An example is shown

in Annex C for your reference.

4.3 Determine the maximum demand in Amperes and kW for the whole house.

4.4 Based on the maximum demand current obtained above, determine the main cable size

and its voltage drop. Show all calculation and how you obtain all the various

parameter in the table provided.

4.5 The following information will be used for the cable sizing.

i. The cables to be used are single-core general purpose PVC insulated cables.

ii. The cables will be enclosed in metallic/non-metallic trunking (Method 3).

iii. The protective device is MCB.

iv. The maximum ambient temperature is 40°C.

v. There is no thermal insulating material.

vi. The number of circuits is obtained based on the table below:

Type of housing Number of circuits

Landed property 1

Condominium, x apartment in the

same storey

Example: if there are 4 apartments

in the storey you are staying, then

it is 4 circuits. HDB, x apartment in the same storey

vii. The cable length is obtained based on the table below:

Your apartment level Cable length (metre) – every level increase by 5m

2nd storey 20m

3rd storey 25m

4th storey 30m

5th storey 35m

and so on …..

For landed property, you may assume a cable length of 30m.

Annex A – Layout Plan (Example)

Legend

Fluorescent fitting (36W)

Circular light fitting (32W)

Circular light fitting (22W)

Television

Ceiling fan

Annex B – Total Connected Load Tabulation (Example)

S/N Location Appliance Specification

(Type)

Power

per unit Qty Sub-total Load Calculation Load current Calculation

1. Room Fluorescent

Lighting

Philips 2xT8 Tubular

fluorescent lamp

18W 2 2 x 2 x 18 = 72W 𝐼 =

𝑃

𝑉 =

230 𝑥1.25 = 0.39𝐴

2. Room Ceiling Fan KDK 5-speed ceiling

fan

55W 1 1 x 55 = 55W

𝐼 = 𝑃

𝑉 𝑥 𝑝𝑓 𝑥 𝑒𝑓𝑓

= 55

230 𝑥 0.85 𝑥 0.9 = 0.31𝐴

3. Room Television PRISM+ 32-inch

television

40W 1 1 x 40W 𝐼 =

𝑃

𝑉 =

230 = 0.17𝐴

4. Kitchen LED Lighting Osram Circular LED

lamp

32W 1 1 x 32 = 32W 𝐼 =

𝑃

𝑉 =

230 = 0.14𝐴

5. Bath & WC LED Lighting Osram Circular LED

lamp

22W 1 1 x 22 = 22W 𝐼 = 𝑃

𝑉 =

230 = 0.10𝐴

Annex C – Maximum Demand Tabulation (Example)

S/N Location Appliance Power

per unit Qty

Sub-total Load

Calculation Load current Calculation

Type of

Final Circuit

Diversity

Factor Demand

1. Room Fluorescent

Lighting

18W 2 2 x 2 x 18 = 72W 𝐼 =

𝑃

𝑉 =

230 𝑥1.25 = 0.39𝐴

Lighting 66% I = 0.39 x 0.66 = 0.26A

2. Room Ceiling Fan 55W 1 1 x 55 = 55W

𝐼 = 𝑃

𝑉 𝑥 𝑝𝑓 𝑥 𝑒𝑓𝑓

= 55

230 𝑥 0.85 𝑥 0.9 = 0.31𝐴

Motor - I = 0.31A

3. Room Television

40W 1 1 x 40W 𝐼 = 𝑃

𝑉 =

230 = 0.17𝐴

Heating and

Power

100% of total

current

demand up to

10 Amperes +

50% of any

current

demand in

excess of 10

amperes

I = 0.17A

4. Kitchen LED Lighting

32W 1 1 x 32 = 32W 𝐼 = 𝑃

𝑉 =

230 = 0.14𝐴

Lighting 66% I = 0.14 x 0.66 = 0.09A

5. Bath &

LED Lighting 22W 1 1 x 22 = 22W 𝐼 = 𝑃

𝑉 =

230 = 0.10𝐴

Lighting 66% I = 0.10 x 0.66 = 0.07A

Annex D - Allowance of Diversity Table

Purpose of final

circuit fed from

conductors or

switchgear to which

diversity applies

Type of Premises

Individual household installations, including individual dwellings of a block

Small shops, stores, offices and business premises

Small Hotels, boarding houses, guest houses, etc.

1. Lighting 66% of total current demand

90% of total current demand

75% of total current demand

2. Heating and Power (Also see 3 to 10 below)

100% of total current demand up to 10 Amperes + 50% of any current demand in excess of 10 amperes

100% f.l. of largest appliance + 75% f.l. of remaining appliances

100% f.l. of largest appliance + 80% f.l. of 2nd largest appliance + 60% f.l. of remaining appliances

3. Cooking Appliances

10 amperes+30% f.l. of connected cooking appliances in excess of 10 amperes + 5 amperes if socket outlet incorporated in unit

100% f.l. of largest appliance + 80% f.l. of 2nd largest appliance + 60% f.l. of remaining appliances

4. Motors (other than lift motors, see 8)

— 100% f.l. of largest motor + 80% f.l. of 2nd largest motor + 60% f.l. of remaining motors

100% f.l. of largest motor + 50% f.l. of remaining motors

5. Water-heaters (instantaneous type)

100% f.l. of largest appliance + 100% f.l. of 2nd largest appliance + 25% f.l. of remaining appliances

6. Air conditioners 100% f.l. of the air- conditioner(s) in the bed- room(s) or in the living room(s), whichever is larger and 40% f.l. of the remaining air- conditioner(s)

100% of current demand of largest point of utilization + 75% of current demand of every other point of utilisation

100% of current demand of largest point of utilisation + 75% of current demand of every other point of utilisation

7. Standard arrangement of final circuits in accordance with Appendix H

100% of current demand of largest circuit + 40% of current demand of every other circuit

100% of current demand of largest circuit + 50% of current demand of every other circuit

8. Socket outlets other than those included in 7 above and stationary equipment other than those listed above

100% of current demand of largest point of utilization + 40% of current demand of every other point of utilisation

100% of current demand of largest point of utilization + 75% of current demand of every other point of utilisation

100% of current demand of largest point of utilization + 75% of current demand of every point in main rooms (dining rooms, etc.) + 40% of current demand of every other point of utilisation

Annex E

Project Report 1 Assessment Rubric (50 marks)

Learning Outcome

Criteria Excellent (A) Good (B) Average (C) Satisfactory (D) Poor (F)

Layout Plan Completeness Exceptional layout plan (drafting software) with dimension and all fixed loads indicated.

Clear layout plan with all fixed loads indicated and missing dimension.

Clear layout plan with missing loads and missing dimension.

Layout plan not so clear with missing loads.

Poorly drawn layout. Demonstrates minimal knowledge of the layout plan.

15 13-15 11-12 9-10 7-8 0-6

Equipment listing Completeness All equipment are listed with all specification recorded.

All equipment are listed with some specification not recorded.

Basic equipment are listed with all specification recorded.

Basic equipment are listed with some specification not recorded.

Few equipment are listed with relevant specification recorded.

10 8-10 7 6 5 0-4

Equipment photo Completeness All relevant equipment photos are attached with label.

80% - 99% of relevant equipment photos are attached with label.

60% - 79% of relevant equipment photos are attached with label.

40% - 59% of relevant equipment photos are attached with label.

<40% of relevant equipment photos are attached with label.

5 5 4 3 2 0-1

Connected load in kW

Accuracy 80% or more Calculation is correct with NO/negligible errors.

70 - 79% Calculation is correct.

60 - 69% Calculation is correct.

50-59% Calculation is correct.

<50% Calculation is correct or no calculation.

10 8-10 7 6 5 0-4

Connected load in Amperes

Accuracy 80% or more Calculation is correct with NO/negligible errors.

70 - 79% Calculation is correct.

60 - 69% Calculation is correct.

50-59% Calculation is correct.

<50% Calculation is correct or no calculation.

10 8-10 7 6 5 0-4

Project Report 2 Assessment Rubric (50 marks)

Learning Outcome

Criteria Excellent (A) Good (B) Average (C) Satisfactory (D) Poor (F)

Type of Final Circuit

Accuracy All load assigned correctly in accordance with DF table.

80% - 99% of load assigned correctly in accordance with DF table.

60% - 79% of load assigned correctly in accordance with DF table.

40% - 59% of load assigned correctly in accordance with DF table.

<40% of load assigned correctly in accordance with DF table.

5 5 4 3 2 0-1

Diversity Factor Accuracy 80% or more DF applied correctly.

70 - 79% DF applied correctly.

60 - 69% DF applied correctly.

50-59% DF applied correctly.

<50% DF applied correctly.

10 8-10 7 6 5 0-4

Maximum demand computation

Accuracy 80% or more Calculation is correct with NO/negligible errors.

70 - 79% Calculation is correct.

60 - 69% Calculation is correct.

50-59% Calculation is correct.

<50% Calculation is correct or no calculation.

10 8-10 7 6 5 0-4

Parameter for Cable selection

Accuracy 80% or more parameter selected correctly.

70 - 79% of parameter selected correctly.

60 - 69% of parameter selected correctly.

50-59% of parameter selected correctly.

<50% of parameter selected correctly. Minimal or no knowledge of the topic

15 13-15 11-12 9-10 7-8 0-6

Cable Sizing and Voltage Drop

Accuracy 80% or more Calculation.

70 - 79% Calculation is correct.

60 - 69% Calculation is correct.

50-59% Calculation is correct.

<50% Calculation is correct or no calculation.

10 8-10 7 6 5 0-4