Service Installation

Transcription

1 Service Installation S T U D E N T M A N U A L March 31, 2005

2 2 STUDENT TRAINING MANUAL Prerequisites: None Objectives: Given the Construction Standards Manual, you will be able to explain and/or demonstrate the application and installation procedure for services. Rationale: The proper service installation will prevent future customer interruptions and voltage problems. Learning Objectives Explain the five types of service classifications. Explain the regulations of the Electric Service Guide regarding customer interface locations. Determine the appropriate conductor for a service installation. Explain the clearance regulations for services. Explain the procedure to install or change a three-phase service. Demonstrate the procedure to install or change a three-phase service. Learning Methods Self-learning + On-the-job Self-learning + On-the-job Self-learning + On-the-job Self-learning + On-the-job Self-learning + On-the-job On-the-Job Demonstration and Practice EVALUATION METHODS Written test Written test Written test Written test Written test On-the-Job Evaluation

3 SERVICE INSTALLATION 3 STUDENT RESOURCES Learning Steps Construction Standards Manual Electric Service Guide 1. Read the Learning Guide. 2. Follow the steps outlined in the Learning Guide. 3. Clarify any questions or concerns you may have. 4. Complete the Practice and Feedback. 5. Complete the Evaluation.

4 4 STUDENT TRAINING MANUAL Lesson 1: Service Classifications Learning Objective:Explain the five types of service classifications. Learning Method:Self-learning + On-the-job Evaluation Method:Written test Introduction Residential Farm General Oilfield Service installations can be divided into various classifications. There are five basic service classifications found in an electrical distribution system. The classification covering a service depends on what the service provides power to and the power requirements. A residential classification is an extension of service to any dwelling unit used primarily for domestic purposes on a permanent or seasonal basis. A farm classification is an extension of service to any standard farmstead, farm irrigation, feedlot or other qualified farm operation. This includes those located on Indian reserves or seasonally operated irrigation systems used exclusively for agricultural purposes. A general classification is an extension of service to any premise used primarily for non-residential or non-agricultural purposes on a permanent or seasonal basis and having demands not exceeding 2000kVA. An oilfield classification is an extension of service to any premise of facilities used primarily for oil production, processing and in-field pumping.

5 SERVICE INSTALLATION 5 Street Lights Street lights account for SaskPower s fifth largest load.

6 6 STUDENT TRAINING MANUAL Lesson 2: Electric Service Guide Regulations Learning Objective:Explain the regulations of the Electric Service Guide regarding customer interface locations. Learning Method:Self-learning + On-the-job Evaluation Method:Written test Introduction The Electric Service Guide contains the requirements of all new or altered services before connection to the utility s service is performed. There is important information found in the Electric Service Guide which pertains to point of delivery and supply service. These topics should be reviewed as they are relevant to the various service classifications. Reference For additional information, refer to Section 2.0 of the Electric Service Guide.

7 SERVICE INSTALLATION 7 Lesson 3: Conductor for Service Installations Learning Objective:Determine the appropriate conductor for a service installation. Learning Method:Self-learning + On-the-job Evaluation Method:Written test Introduction There are several factors which determine the conductor required for a supply service. These factors include: Type of service Overhead - conductor must be designed to hold tension Underground - all conductors are coated to insulate them from ground. Number of conductors required Single-phase, 3-wire Three-phase, 3-wire Three-phase, 4-wire Load - conductor size must be large enough to handle the current of the connected service Voltage - sufficient insulation must coat the conductor for the voltage rating Voltage must be a consideration as it affects the amount of current Length - the longer the supply service, the greater the resistance and voltage drop Load - any load the customer may add in the future must be taken into consideration Service Conductors Due to the high cost of copper, light weight aluminum is usually

8 8 STUDENT TRAINING MANUAL preferred as the service conductor. Reference For additional information on service conductor size, refer to A- 22-XX in the Overhead Construction Standards manual and B- 22-XX in the Underground Construction Standards manual.

9 SERVICE INSTALLATION 9 Lesson 4: Clearance Regulations for Services Learning Objective:Explain the clearance regulations for services. Learning Method:Self-learning + On-the-job Evaluation Method:Written test Introduction Maintaining the proper clearance for service conductors is important as it provides: safety to the public and the worker continuity of service protection of property The clearance regulations are found in the Construction Standards manuals. They have been put in place to conform to the CSA standards and guidelines specified in the Standard Engineering Practices manual and the Electric Service Guide. Point of Attachment The point of attachment refers to the location where the utility s cables attach to a customer owned structure. Reference For additional information on point of attachment, refer to C , Sheet 1 of 1, in the Overhead Construction Standards Manual. Ground Clearances Ground clearance refers to the minimum clearance from the utility s

10 10 STUDENT TRAINING MANUAL conductor to ground that must be maintained to protect the public. Reference For additional information on clearances, refer to C in the Overhead Construction Standards manual. Building Clearances Various clearance standards apply when stringing conductor over or near buildings and must be maintained at all times. ---Note--- Various clearance standards apply when stringing conductor over or near buildings and must be maintained at all times. Reference For information on building clearances, refer to C in the Overhead Construction Standards manual. Underground ---Note--- Services are not to be strung over wells, swimming pools or around antenna structures. An underground service must maintain minimum clearances from buildings, gas lines, high voltage lines and decks or fences. The minimum clearance requirements can be found in the Underground

11 SERVICE INSTALLATION 11 Construction Standards manual. Reference For additional information on underground clearances, refer to C in the Underground Construction Standards manual.

12 12 STUDENT TRAINING MANUAL Lesson 5: Changing Three-Phase Services Learning Objective:Explain the procedure to install or change a three-phase service. Learning Method:Self-learning + On-the-job Evaluation Method:Written test Introduction Voltage Check Phase Rotation Change Service The procedure below must be followed when changing the service conductors on a three-phase service. This procedure will maintain a positive phase rotation once the service conductors have been changed. Check the name plate(s) of the transformer(s). With the use of a voltmeter and a visual inspection, confirm the reference phase (red phase) on the delta connected secondary. The red phase will measure 208V to ground. Hook the phase rotation meter to RYB (red, yellow, blue) to verify the rotation. Mark the phases accordingly using colored tape on both the supply and consumer ends of the service. Notify the customer of the outage. Open main (switch, breaker). Remove the service. Replace the service. Hook the neutral and R (reference phase) up permanently on both ends. Hook up Y and B temporarily on the supply side and permanently on the consumer end. Check the rotation with a phase rotation meter using the same phasing as previously marked. The phase rotation meter should have the same rotation as the previous test - if not, reverse the Y and B leads. Complete the connections.

13 SERVICE INSTALLATION 13 Close main (switch, breaker).

14 14 STUDENT TRAINING MANUAL Lesson 6: Procedure to Install or Change a Three-Phase Service Learning Objective:Demonstrate the procedure to install or change a three-phase service. Learning Method:On-the-Job Demonstration and Practice Evaluation Method:On-the-Job Evaluation

15 SERVICE INSTALLATION 15 Skills Practice 1. Voltage check: 1. Perform a voltage check. 2. Identify the red phase (where applicable). 2. Phase rotation check: 1. Verify the phasing using a phase rotation meter. 2. Mark the phasing with phasing tape. 3. Change service: 1. Open the main switch. 2. Remove and replace the service. 3. Hook up the neutral and red phase completely. 4. Hook up the Y and B phase temporarily. 5. Check the phasing using a phase rotation meter. 6. Correct the phasing if incorrect. 7. Complete the connections. 8. Close the main switch.

16 16 STUDENT TRAINING MANUAL Summary To summarize this module, you have learned: Five types of service classifications. The regulations of the Electric Service Guide regarding customer interface locations. To determine the appropriate conductor for a service installation. The clearance regulations for services. To install or change a three-phase service. Practice Feedback Review the lesson, ask any questions and complete the self-test. Evaluation When you are ready, complete the final test. You are expected to achieve 100%.

17 SERVICE INSTALLATION 17 Review Questions 1. The extension of a service to the premise of a facility used primarily for infield pumping is called: (a) General. (b) Farm. (c) Residential. (d) Oilfield. 2. The extension of a service to a premise having demands not exceeding 2000kVA is called: (a) General. (b) Farm. (c) Residential. (d) Oilfield. 3. The extension to a dwelling unit used primarily for domestic purposes and not commercially operated is called: (a) General. (b) Farm. (c) Residential. (d) Oilfield. T / F 4. When an overhead system exists, SaskPower normally installs an underground supply service to new customers requesting a residential service. T / F 5. SaskPower owns the facilities up to the point of delivery on a residential service. T / F 6. A polyphase farm service is normally served from an underground system. T / F 7. For single-phase farm services up to 200A and 300V, the customer will supply and install a metering centre for service support and attachment. T / F 8. For an underground general service application, transformation is located on the consumer s property.

18 18 STUDENT TRAINING MANUAL T / F 9. Transformation for an oilfield service is required to be on SaskPower property. T / F 10. Overhead and underground service conductors differ in that underground service conductors are designed to hold tension. T / F 11. All conductor in an underground service is enclosed in a protective coating. 12. Which factors determine the supply service conductor required? (a) The voltage supplied to the consumer is 120/ 240V. (b) The length of the supply service is 105m. (c) The supply service is buried. (d) All of these T / F T / F T / F T / F 13. Aluminum conductors are most commonly used for supply service applications. 14. Safety of the public and the worker is one reason for clearance regulations. 15. Property damage and service interruptions can occur if clearance regulations are not met. 16. Clearance regulations are only required for overhead services. 17. Which of the following is the requirement for stringing a residential service over a habitable building? (a) It may cross over the building with 1.0m clearance. (b) It may cross over the building with 2.5m clearance. (c) It may cross over the building with 4.0m clearance. (d) It may not cross over the building.

19 SERVICE INSTALLATION Which of the following is the requirement for stringing a residential service over a swimming pool. (a) It may cross over with 3.0m clearance. (b) It may cross over with 4.5m clearance. (c) It may cross over with 5.5m clearance. (d) It may not cross over. T / F 19. It is not necessary to verify phase rotation on a threephase service change.

20 20 STUDENT TRAINING MANUAL Review Question Solutions 1. Oilfield. 2. General. 3. Residential. 4. T 5. T 6. F 7. F 8. T 9. F 10. F 11. T 12. All of these 13. T 14. T 15. T 16. F 17. It may not cross over the building. 18. It may not cross over. 19. F