How to calculate the size of wire and mcbs for my house

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We received a query from one of our reader on how to calculate the size of MCB for my house. Since, the query is quite common we are here writing the solution.   QUERY – Dear Sir,   I am fond of your articles, i study them regularly. Sir i have a query regarding wiring of a 3 floor building. Each floor has 10.nos of shop, i have given main power to each shop 2000W, and backup power by 500w by seperate wiring through C/O in main Panel.   And at the DB end for Each Power line give 16A […]

How to calculate size of capacitor to increase power factor

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How to calculate the size of capacitor bank to improve the power factor of a system If you are searching a way to know how to correlate power kW and the required kVAR rating of capacitor. Thumb Rule Formula – required kVAR =  Power X Multiplying Factor (Table given below) Or in detail you can solve by given formula Required kVAR =  power (tan A – tan B) For example –  Power = 100 kW, P.F is 0.75 and required P.F is 0.9 Solution – Multiplying factor from table from 0.75 PF to 0.9 PF= 0.398 From above formula the […]

Rated Current of Cable – XLPE Insulated Aluminium Cable – 1100 Volts grade

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Current Carrying Capacity of Cable  – Aluminium XLPE insulated 1100 Volts grade LT Cable. Rated current for 1100 Volts Grade Cable. For diameter size of cables please click — HERE Unarmoured Cable Aluminium Cable Cross-sectional area        (Sq MM)  Current capacity in  in in Cross-sectional area        (Sq MM) Current capacity in  in in Cross-sectional area        (Sq MM)  Current capacity in  in in Cross-sectional area        (Sq MM) Current capacity in in in Cross-sectional area        (Sq MM) Current capacity in Ground Duct Air   Ground Duct Air   Ground Duct Air   Ground Duct Air   Ground Duct Air 1cX4  —  —  — 2cX4  34 […]

Diameter of 1100 Volts Grade XLPE, Insulated Cable (IS-7098- Part- I)

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Dear Reader, Below is a list of cable diameter (cable size) of armored and unarmored 1100 Volts Grade XLPE Insulated cables as per IS 7098. Please use this list as a reference only, please consult a professional designer for any design and procurement purpose. For electrical engineer jobs – Click Here Unarmoured Cable Cross-sectional area        (Sq MM) Overall Diameter (mm) Cross-sectional area        (Sq MM) Overall Diameter (mm) Cross-sectional area        (Sq MM) Overall Diameter (mm) Cross-sectional area        (Sq MM) Overall Diameter (mm) Cross-sectional area        (Sq MM) Overall Diameter (mm)                     1cX4 8 […]

How to create cable schedule for a project

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Hi reader, Wondering how to create cable schedule for approval of your project? It is easy. Do you have the SLD (single line diagram of HT/ LT Side) Do you have the equipment layout drawings, ask the consultant to provide. Do you have the Cable tray drawing, please get a cable tray drawing. This much information is good enough to get the job done. First of all make an excel using SLD and the equipment drawing Source Location Destination Location Cable Type Grade Length Ex : S.No Source Location Destination Location Cable Type Grade Length 1 SEB NA HT Panel […]

Technical specification of SPV – roof top solar power plant

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Tech specs for a standalone roof top solar plant 100 KW IS Codes to follow 1. IEC: 61215/IS 14286 : Requirements for photovoltaic modules 2. IEC 61730-I : Requirements for construction for photovoltaic modules 3. IEC 61730-II : Requirements for testing for photovoltaic modules 4. IEC 61683, 1999 : Requirements for efficiency of photovoltaic modules 5. IEC 60068-2-1, (2-2,14,30): Requirements for Environment capacity for photovoltaic 6. IEC 60529:1989+A1:1999 : Requirements for IP-65 protection of photovoltaic modules 7. IEC 62109 : Requirements for Safety of photovoltaic modules 8. IEC 61727 : Requirements for Grid connectivity of photovoltaic modules 9. IEC 60227/IS […]

33 kV Gas Insulated Switchgear Part 1

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33 kV Gas Insulated Switchgear In Underground metro stations, there are two 33 kV auxiliary substations in each station. These substations have GIS type switchgear installation, separate earth mats and METs, a switching room or feeder post for ROCS charging.   I tried to keep a short, crisp summary of a typical 33 kV GIS switchgear which might help in working in a 33kV substation.   The insulating gas for this switchgear would  be SF6 Sulphur Hexafluoride, at a temperature 20 °C at 0.05 MPa. Bus Rating would be 33 kV GIS, 25 kA for 3 sec, Single bus bar […]

How to calculate the size of MCBs while designing a circuit

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To decide the number and types of MCB/ ELCBs in your office/ home, you must note down the number of electrical equipment used in your premises. Then start dividing them into different electrical branches (on the basis of your wire size calculations and cost effectiveness). Example 02 — Click here   — For JOB Application, please mail at pratham6138@gmail.com —   Example 01 For example, suppose one building has 8 rooms with following equipment in each room. Room-1 3 X 40 W Bulb (NC) 1 X 60 W F an (NC) Room-2 2 X 40 W Bulb (NC) 1 X […]

MCB types based on Number of poles

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Types of MCBs used (Poles) SP – Single Pole In Single Pole MCB, switching & protection is affected in only one phase. Application: Single Phase Supply to break the Phase only. SPN – Single Pole and Neutral In Two Pole MCB, switching & protection is affected in phases and the neutral. Application: Single Phase Supply to break the Phase and Neutral. DP – Double pole In Two Pole MCB, switching & protection is affected in phases and the neutral. Application: Single Phase Supply to break the Phase and Neutral. TP – Triple Pole In Three Pole MCB, switching & protection is affected in […]

IP Codes

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IP Rating:  IP Rating First Digit Second Digit Third Digit (Optional) Solid Objects Protection Liquids Protection Mechanical impacts 0 No special protection No protection. No protection. 1 Protected against solid objects greater than 50mm in diameter ( such as large part of the body like hand) Protection against vertically falling drops of water e.g. condensation. Protects against impact of 0.225 joule (150 g weight falling from 15 cm height) 2 Protected against solid objects over 12 mm in diameter (person’s fingers) Protection against direct sprays of water up to 15° from the vertical. Protected against impact of 0.375 joule (250 g […]