Electrical Wiring Plan PDF

Electrical Wiring Plan is a technical representation of electrical system proposed to be installed in building or house. It includes material, devices and equipment. Sample Electrical Wiring Plan Parts of an Electrical Wiring Plan Floor Plan is a plan of a room or floor of a...

Electrical Wiring Plan is a technical representation of electrical system proposed to be installed in building or house. It includes material, devices and equipment. Sample Electrical Wiring Plan Parts of an Electrical Wiring Plan Floor Plan is a plan of a room or floor of a building drawn to scale as if viewed from above. Sample Floor Plan The Legend shows the meaning of each symbol used in the electrical plan. The following are sample symbols commonly used in the plan. The Load Schedule The following details can be seen in the schedule of load: Number of branch circuit of electrical wiring system Number of light outlet, power outlet and switches per branch Total wattage rating of the load per circuit branch Total current load per circuit and size of wire used Computation of the total power and current of each circuit branch. Size of conduit used for feeder line and branch circuits. The Riser Diagram is a single line diagram presentation of the entire electrical circuit from the service entrance up to the smallest circuit branch. It shows: Character and type of service, single phase 2 wire/ 3 wire Size of service entrance conductor and the conduit used Type and size of wire for each branch Size of protective device for main circuit breaker and each branch 230V Sample Riser Diagram: Single Line Diagram Title Block The title block or the name plate indicates the following details: 1. Name and location of the proposed installation. 2. Name and address of the owner. 3. Name and signature and dry seal of master electrician or electrical engineer. 4. Printed name of the owner 5. Initial of the draftsman and the data when drawing was done. RESIDENCE B-16 L-34 P-6 Pleasant Hill Subd. City of San Jose del LOCATION Monte, Bulacan DRAWN BY Arch. Shadrach Joseph Siguan CHECKED BY Engr. Steve John C. Sabocojan Sample Title block Specification Specification includes the following: 1. Classification of service 2. Type of wiring method to be used 3. Number of branch circuit and their corresponding sizes 4. Supplies materials to be used by the contractor Location map shows the following details: 1. Bordering areas showing the well known streets 2. Location of the utility company pole which supplies electric energy Sample Location Map CIRCUITING GUIDELINES based on the Philippine Electrical Code (PEC) requirements: 1. The code requires sufficient circuitry to supply residential load of 30 watts per square meter. 2. The requirement 30 watts per square meter is up to 80 square meters for 20 amp circuit (2400 watts) or 60 square meters for 15 ampere circuit (1800watts). 3. The code requires a minimum of 20 amperes for appliance branch to feed all small appliances outlet in the kitchen, dining, and living room. 4. The general purpose branch shall be rated 20 amperes. Wire no. 12 AWG is the minimum size of conductor required for all the convenience outlets. 5. The minimum circuit load of 15 ampere circuit breaker shall be used for light circuit. 6. Plug outlet or convenience receptacles shall be counted in computing the load if it’s not in the load of general lighting circuit. For 15 amp circuit: 9/1.5= 6 outlets For 20 amp circuit 12/1.5= 8 outlets 7. Convenience outlet should be planned properly. It should not be placed in onecircuit so that the failure of one will not deprive the supply of power to the other circuit. 8. All kitchen outlets should be fed from any of the circuits except lighting circuit. 9. Certain outlet in the room should be designed as appliances outlet. All kitchen receptacles Dining room receptacles  One in the living room 10.The code requires that at least one 20 amp circuit is supplied to the laundry outlets. 11. Provide a separate circuit for air conditioning units.( Consider it as a special purpose circuit / outlet ) SELF-CHECK 1.2 PARTS OF ELECTRICAL WIRING PLAN Directions: Identify what is being referred to by the following statement. Write your answer on a separate sheet of paper. 1. It is a technical representation of an electrical system proposed to be installed in building or house. 2. It is a part of the electrical plan which shows the size of service entrance conduit. 3. It is a part of the wiring plan which shows the number of branch of electrical circuit. 4. It shows the meaning of electrical symbols used in the electrical plan. 5. It shows the name and location of the proposed wiring installation. 6. It is a plan of a room or floor of a building drawn to scale as if viewed from above. 7. It is a part of the plan classification of service and type of wiring method to be used. 8. The PEC requires that at least one amp is supplied to the laundry outlets. 9. The PEC requires sufficient circuitry to supply residential load of watts per square meter. 10. The minimum circuit load of amperes circuit breaker shall be used for light circuit.  INFORMATION 1.3 SKETCHING AN ELECTRICAL WIRING PLAN Sketching an Electrical Wiring Plan Before starting to sketch an electrical wiring plan, the minimum requirements for each area or room in the building should be considered. BEDROOM: A bedroom is a private room where people normally sleep for the night or relax during the day. A general illumination should be provided in this area. Convenience outlets should also be installed on each side and within 1.5 to 2 meters of the centerline of each bed location. Lighting and power provision for the bedroom MASTER’S BEDROOM: The master’s bedroom is the principal bedroom in a house and is usually occupied by the head of the household. The lighting and power/convenience outlets requirement is similar to the ordinary bedroom. Lighting and power provision for the masters bedroom DINING AREA: A dining area is a part of the house for consuming food. In modern times it is usually adjacent to the kitchen for convenience in serving. This area should be well lighted and provided with convenience outlets. Lighting and power provision for a typical dining area LIVING AREA: A living area is a part in a residential house for relaxing and socializing. This should be provided with convenience outlets. Usually chandelier and pin lights are installed in this area as shown in the drawing. Lighting and power provision for the living area KITCHEN: A kitchen is a part of a house used for cooking and food preparation. This area should be well lighted and should be provided with convenience outlets. A special purpose outlets should be installed for cooking range and other kitchen appliances. Lighting and power provision for the kitchen Toilet and Bathroom: A toilet is a sanitation fixture used primarily for the disposal of human excrement and urine. A bathroom is a room for personal hygiene, generally containing a bathtub or a shower. Lighting should be installed in this room. Convenience outlet could also be installed but it should be near the mirror or awayfrom the shower area. Lighting and power provision for the Toilet & Bathroom PORCH: Some porches are simply attachments of a home to give the traditional appearance to a home. Similar to a living area, this should also be provided with convenience outlets. Usually chandelier and pin lights are installed in this area as shown in the drawing.  Typical Porch Lighting and power provision GARAGE: The traditional opening of garage door is through manual operation. But because of the high technology, garage door remote has been introduced. Lighting and convenience outlets should be provided in this area. Typical Garage Lighting and power provision GARDEN: A garden is a planned space, usually outdoors, set aside for the display, cultivation of plants and other forms of nature. Lighting and convenience outlets should be provided in the area. Garden Lighting and power provision The final design of the typical bungalow residential wiring plan is shown below, indicating service entrance, electric meter, position of the switches, convenience outlets, lighting outlets and panel board. Typical Bungalow Residential Electrical Wiring Plan  READING ELECTRICAL PLAN To read electrical plans, start with the floor plans where you can get an idea of the layout and intent of the space. Carefully study and understand the wiring diagrams, which show the paths that wires will take from each piece of equipment back to the panel. Electrical components are represented by various symbols and their corresponding meaning. Figure A: LIGHTING OUTLETS LAYOUT Figure B. CONVENIENCE OUTLETS/POWER LAYOUT Number of lighting outlets, switches, and convenience outlets (C.O.) found in figures A and B Part of the No. of No. of No. of C.O.-Type House Lighting Switch-Type Outlet Living Area 1 2- s2 2 1 - s3 Bedroom 1 2 1 & 1 - acu 1 - s3 Bedroom 2 2 1 & 1 - acu 1- s1 Kitchen 1 2 & 1 - Range Outlet 1- s3 1 - s2 Dining Area 2 1 Porch 1 1 Car Port 2 1 Toilet & Bath 1 1-s 1 1-s Family hall 1 2 Open Area 5 1 Passage 1 To determine total watts and current loads in figures A and B Figure A: Lighting Outlets Layout Examine the lighting layout in figure A. There are 19 lighting outlets. Split the 19 lighting outlets into two circuits 1 and 2. There are 19 light outlet divided into two Circuit 1 = 9 light outlets Circuit 2 = 10 light outlets A. Circuit – 1 Lighting Load (9 light outlets) 1. The Philippine Electrical Code provides that 100 watts be the maximum load light outlet. Thus, for 9 light outlets at 100 watts, multiply: 9 outlets x 100 watts = 900 watts 2. Compute the current load 900watts/230volts = 3.91amperes  B. Circuit – 2 Lighting Load (10 lights outlets) 1. For 10 light outlets, find the total load in watts: 10 light outlets x 100 watts = 1,000 watts 2. Compute current load: 1000 watts/230 volts = 4.35 amperes Figure B: Convenience Outlets/Power Layout Count the convenience outlets in figure B. There are 16 convenience outlets. Circuit – 3 = 6 convenience outlets Circuit – 4 = 6 convenience outlets Circuit – 5 = 1- range load Circuit – 6 = 1- water heater load Circuit – 7 = 1- Aircon Unit Circuit – 8 = 1- Aircon Unit C. Circuit – 3 for small Appliance Load: The Philippine Electrical Code specifies 180 watts load limit per convenience outlet. Thus: 1. Find the number of appliance outlet and total load in watts. 6 outlets X 2 gang per outlet x 180 watts 12 x 180 = 2,160 watts 2. Compute current load 2,160 watts/230 volts = 9.39 amperes D. Circuit - 4 for small Appliance Load 1. Find the number of appliance outlet and Total Load in watts. 6 outlets X 2 gang per outlet x 180 watts 12 x 180 = 2,160 watts 2. Compute current load 2,160 watts/230 volts = 9.39 amperes E. Circuit - 5 for Range Load 1. Range load (appliance rating) at 8.0 kw = 8,000 watts 2. Solve for current load 8,000watts/230 volts = 34.78 amperes F. Circuit - 6 for water Heater load  1. One unit of water heater at 2.5 kw = 2,500 watts 2. The total current load will be; 2,500 watts/230 volts = 10.86 amperes G. Circuit - 7 and 8 with 1-unit air conditioner each 1. One unit of air conditioner at 1.5 horse power is: 1.5 hp x 746 watts = 1,119 watts Article 6.7 of the Philippine Electrical Code (PEC) provides that: “Branch circuit conductor supplying a motor shall have an ampacity notless than 125% of the full load current” 2. Current load: 1,119 watts/230 = 4.87 amperes 4.86 x 125% = 6.07 amperes Total watts and current loads from circuit 1 to circuit 8: Ckt. No. of Total rating Total No. Load Outlets in Watts rating in Ampere 1. Lighting Outlets 9 900w 3.91A 2 Lighting Outlets 10 1,000w 4.35A 3 Convenience Outlets 6 2,160w 9.39A 4 Convenience Outlets 6 2,160w 9.39A 5 Range Outlet 1 8,000w 34.78A 6 Water heater Outlet 1 2,500w 10.86A 7 Aircon Unit Outlet 1 1,119w 4.87A 8 Aircon Unit Outlet 1 1,119w 4.87A Total Rating 18,958w 82.42 A