"SLC21/WK6: Electricity bill and Electrical Cable, Circuit Breaker size Calculation."
Today I will be dropping my assignment entry for this technical learning challenge, is not an easy one at all and I always try my best to do my things right, walk with me as I take you round this post, hope you are having a nice weekend?
Write three key differences between XLPE and PVC cables. |
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| Factor | XLPE Cable | PVC Cable |
|---|---|---|
| Insulation material | It is made up of crossed-linked polyethylene material. | It is made up of Polyvinyl Chloride. |
| Temperature rating | It has higher temperature rating than PVC Cable, therefore it's suitable for high temperature applications because it can withstand temperature up to 90°C. | It does not have high temperature rating and can only withstand temperature of 70°C. |
| Flame Retardanc | It can withstand flame more than the PVC Cable therefore reducing the rate of fire outbreak when faulty. | It can't withstand flame like the XPLE Cable. |
Write three key differences between single-core, two-core, and three-core cables. |
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| Factor | Single core | Two core | Three core |
|---|---|---|---|
| Number of conductor | It's has one conductor | It has two Conductor | it has three Conductor |
| Applications | It can be used as earthing or as a neutral Conductor. | It can serve the purpose of simple power circuits. | It can be used for Three phase systems. |
| Load Capacity | It can accommodate higher Currents as a result of its single design. | It has lower Current capacity compared to Single-Core | It can handle higher loads than Two-Core because of its three Conductor |
| Write about peak and off-peak hours in your country. |
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The peak hour in Nigeria
This is the period of highest power demand in my Country Nigeria, it is usually around 7AM to 10AM in the morning and 5pm-10pm at evening.
Off-Peak hour
This is the period of time in which they is reduced demand for electricity. It is usually around 10AM-4PM and 10PM-6AM. During this period, people are usually not at home and when people are sleeping at night.
Calculate your house load and prepare the electricity bill for November 2024 by following Example 1. |
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So I will share the electricity consumed, based on the example shown by the Professor
| In my house, they're six lights bulb of 30watts that are on for 5hours per day, 3Fan of 70watts that is on for 3 hours per day and a Refrigerator of 400watts that is on for 6 hours per day. Our Electricity Company Electrical bill per unit is 0.18unit. How much will my bill be in November 2024? |
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Solution
Formula to calculate Electricity: Consumption= Watts* Number of Loads* Hours
Electricity Consumption of the Lamp per day is=
Watts* Number of Loads* Hours= 30 * 6 * 5=900WH
=0.9KWH(1KW= 1000 Watts)
**Electricity Consumption of the Fan per day is=
Watts x Number of Loads x Hours=
70 3 3=
630Watts
0.63KWH(1KW= 1000 Watts)
Electricity Consumption of the Refrigerator per day=
Watts x Number of Loads x Hours=
400* 1* 6=
2400Watts
2.4 KWH(1 KW= 1000 Watts)
Total Electricity Consumption in a day
=Lamps +Fan + Refrigerator
= (0.9+0.63 + 2.4) KWH
=3.93KWH (1 KW= 1000)
Total Electricity Consumption for November 2024=
Total Electricity Consumption in a day* 30(November= 30days)
=3.93* 30
=117.9KWH
Electrical bill per Unit= 0.18Steems
Total Electricity bill for November 2024= 117.9* 0.18
=21.222Steem.
Calculate the total electricity bill with the HT meter values given in Example 2 and design an electricity bill in Excel. |
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HT Meter Reading:
| Date | R1( Peak) | R2(Off Peak) | Total KWH | ||
|---|---|---|---|---|---|
| 01 | 11 | 2024 | 2625.20 KWH | 9692.81 | 12318.01 |
| 30 | 11 | 2024 | 2665.26KWH | 9825.21 KWH | 12490.47 |
| Peak rate | 1.5 Steem |
|---|---|
| Off rate | 1.0 Steem |
Formula:
R1(Peak)=(2665.26-2625.20)KWH * 18000= 721080
R2(Off Peak)=(9825.21-9692.81)KWH * 18000= 2383200
Total KWH = R1 +R2 = 721080 + 2383200 = 3104280
Total KWH = (12490.47-12318.01)KWH = R1 + R2
Total Electricity Bill = R1(Peak) * 0.15 = 721080 [Per Unit cost = 0.15 Steem(Peak)]
Total Electricity Bill = R1(Peak) * 0.15 = 721080 * 0.15
Total Electricity Bill R1(Peak) = 108162 [Per Unit cost = 0.15 Steem(Peak)]
Total Electricity Bill = R2(Off Peak) * 0.10 = 2383200 [Per Unit cost = 0.10 Steem(Off-Peak)]
1 KWH = 1 unit
Figure out the cable and circuit breaker sizes you need to setup a 20 ampere, 220 volts, and power factor (PF) 0.9 washing machine at home. |
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To determine the Cable Size and Circuit Breaker we may consider using the formula provided in the task which is given below.
Power, P= V * I * PF
Where;
P = Power = ?
V = Voltage = 220 volts
I = Current = 20 Amp.
PF = Power factor = 0.9
= 220 * 20 * 0.9
= 3960 Watt
To determine the cable size and circuit breaker from the above divide the total power by three.
P = 3960/3 = 1320 Watt
Therefore, 1320-watt load would require a 2.00 RM cable and C10 (10 Amp) circuit breaker for the washing machine at home.
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