SLC21/WK6: Electricity bill and Electrical Cable, Circuit Breaker size Calculation!

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Another interesting week. I learned a lot from your courses, which were six weeks long. So I thank you both Professors @solaymann and @mahadisalim who arranged this course. And tried to explain electrical engineering concepts in a very simple way.

Even if one is not an electrical engineering student, he / she can easily understand these concepts. Unfortunately, I could not participate in all your courses. I have only participated in one course before.

So there were my papers. That's why I didn't participate. So I learned about this course and made a post, so I request my steemit team that you give another chance to both professors and Steemian learn about various concepts which is related to the field of electrical.

I pray to Allah that Allah may always keep you safe and give you success in every field.

Write three key differences between XLPE and PVC cables?

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Difference	Cross-linked Polyethylene (XLPE) Cable	Polyvinyl Chloride (PVC) Cable

Connection	XLPE cables are used for electrical connection of line above 33KV.	PVC Cables are used for electrical connection of line up to maximum 11KV.

Durability	The durability of this cable is high.	The durability of this cable is short as compared to XLPE.

Cost	Expensive as compared to PVC cables	Cheaper as compared to XLPE cables

Temperature	Temperature resistance of this cable up to 90 degrees Celsius	Temperature up to 70 degrees Celsius

Usage / Voltage	XLPE cables are used in high voltage lines	PVC cables are used in low voltage lines

Write three key differences between single-core, two-core, and three-core cables?

Difference	Single-core	Two-core	Three-core

Usage	Single core cables are used in Electrical connection for home	These are used in home appliance	These are used in three phase motor

Connection	Loads are connected through single wire	Loads are connected through two wires	Loads are connected through three wires i-e (Red, yellow, black or green)

Size	The size of single core cables up to (1-500) RM and these are used in low voltage	The size of two core cables up to 220 V	The size of three core cables up to (1-300) RM and are also used in low voltage

Write about peak and off-peak hours in your country?

Peak & Off-peak hour

I clearly understand the concept of peak and off peak hours. Earlier I didn't know about these concepts because I'm student of law.

You explained to us about these concepts in a very easy way.

According to Official website of FESCO the peak and off-peak hours are below:

Months	Peak Hours	Off-peak Hours

December to February	5 PM to 9 PM	Remaining 20 Hours

March to May	6 PM to 10 PM	Remaining 20 Hours

June to August	7 PM to 11 PM	Remaining 20 Hours

September to November	6 PM to 10 PM	Remaining 20 Hours

B. Calculate your house load and prepare the electricity bill for November 2024 by following Example 1?

• In my house, four lights of 12 watts are on for 6 hours per day

• Five fans of 62 watts (size 48 inches)are on for 4 hours per day

• Refrigerator of 4k watts is on for 1 hour per day due to change in season because winter has arrived.

• Our electricity company's (FESCO) electricity bill per unit is 0.14 Steem / 11.7 PKR.

Solution

Account to Formula

Electricity consumption= Watt × Number Of Loads × Hours

1KW = 1000W

Calculate the Electricity consumption of Lights / Lamps

Electricity consumption of Lights/ Lamps per day= Watts × Number Of Loads × Hours

= 12 × 4 × 6

= 288 WH =0.288 KWH

Calculate the Electricity consumption of Fans

Electricity consumption of Fans per day= Watts × Number Of Loads × Hours

= 62 × 5 × 4

= 1240 WH =1.24KWH

Calculate the Electricity consumption for Refrigerator

Electricity consumption for Refrigerator per day= Watts × Number Of Loads × Hours

=4,000 × 1 × 1

= 4,000 WH = 4KWH

Total Electricity consumption in a day

Lights/ Lamps + Fans + Refrigerator

=(0.288+1.24+4)KWH

=5.52 KWH

1KWH = 1Unit

5.52 unit consume per day.

Total Electricity consumption for November 2024

|Using Formula = Total Electricity consumption in a day × 30

=5.52 × 30

= 165.6KWH

165.6 units

Electricity bill per unit = 0.14 steem

Total Electricity consumption bill for November 2024 = Total Electricity consumption for November 2024 × Per unit cost

= 165.6 × 0.14

= 23.184 steem

C. Calculate the total electricity bill with the HT meter values ​​given in Example 2 and design an electricity bill in Excel?

Peak Rate 1.5 steem

Off peak Rate 1.0steem

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Formula

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R1 (Peak) = (2665.26-2625.20) × 18,000 = ?

= (40.06) × 18,000

= 7,21,080 KWH

R2 (Off Peak) = (9825.21-9692.81) × 18,000 = ?

= (133) × 18,000

= 2,394,000 KWH

Total KWH = R1 + R2 = ?

R1 = 7,21,080 KWH

R2 = 2,394,000 KWH

= 7,21,080 + 2,394,000

= 3,115,080

TOTAL KWH = (12490.47-12318.01) = R1 + R2

= 172.46 = 3,115,080

Total Electricity Consumption Bill= R1 (Peak) × 0.15 = ?

= 7,21,080 × 0.15

= 108,162

Total Electricity Consumption Bill= R2 (Off Peak) × 0.10 = ?

= 2,394,000 × 0.10

= 2,39,400

Sorry 😔 professors I don't know the use of Excel sheet to generate bill. It is very difficult task for me. So due to this reason I don't generate the bill. I apologize to you.

D. 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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V = Voltage = 220 volts

I = Current = 20 Amp

PF = Power factor = 0.9

Power = P = ?

P = V × I × PF

P = 220 × 20 × 0.9

P = 3960 W

According to Instructor Instructions mentioned in course

So we dividing the answer of power (3960) by three

= 3960/3

= 1320 W

From my answer I clearly know that 1320 Watt load would require a 2.0 RM cable size mentioned in above figure in course and C10 (10 Amp) circuit breaker for that electrical home appliance load.

I invited to my friends to participate in this amazing contest

@aaliarubab, @wuddi and @missyleo

Best Wishes 😍 Always be happy