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The Art of wires: A guide to basic electrical wiring
Edmund Hagensen III • July 29, 2020
Electrical wiring is a process in connecting devices and accessories in order to distribute electrical power to different devices, equipment and appliances depending on the application.
I’m writing this article for clients and those who want to start out their electrical wiring projects. This will serve as a guide for the work flow of the projects.
I have 2 years of work experience in the field of electrical engineering mainly on electrical installation, operation and maintenance in high-rise buildings.
Before starting your wiring works:
1. Check the plan and coordinate with the designers (structural, architectural, mechanical, electrical, plumbing and fire protection).
This is to prevent any errors in estimation and installation of the devices. Planning before doing the working can also save resources and time finishing the project.
2. Prepare all the materials and tools needed for the work to prevent any delays caused by lack of materials or tools.
When working:
1. Locate and layout the location of the devices according to the plan to avoid confusion and misjudgment.
2. Lay the conduits as neat and less bends as possible for easier cable pulling.
3. Always use proper bending and connection of the conduits.
4. When in doubt, always consult with the proper person according to your concern.
5. Always clean your workplace for the safety of other workers and to improve your working environment.
TESTING
Continuity Testing:
I used an ohmmeter to check for the continuity of the wires that are installed.
To check for the continuity, the end of the wires should be connected to each other and with the ohmmeter, I measured the resistance at the other end of the wires. The measurement should read 0 Ohms (closed circuit) and infinity (open circuit).
Insulation Resistance Testing:
I used an insulation resistance tester for this test.
To check for the insulation resistance of the wires, make sure that the wires are in an open circuit. When testing, please also note that a very high voltage will be injected to the wire during testing (possible electric shock when in contact with a person). Insulation resistance should be higher than the allowed minimum insulation resistance standard requirement which is 25 mega ohms in my country.
Functionality Testing:
I used a voltmeter for the functionality testing.
When the whole electrical system is energized, it is advised first to test the voltage level of each power outlet and receptacles to avoid damage to the device and equipment that will be plugged in.
Each power outlet and receptacle must read 220v (Philippine standard voltage)
NOTES
1. Splicing and termination of cables should be done or supervised by a qualified personnel (Registered Master Electrician, Registered Electrical Engineer)
2. Always do a continuity and resistance test before energizing to quality checking and to avoid future troubles caused by errors in workmanship and faulty devices.
Tips:
In my recent project, I used a portable power generator in addition to my testing. This was used to simulate actual working condition to my project and to show to my client before tapping into the energy service provider.
Engr. Edmund S. Hagensen, III Registered Master Electrician, Registered Electrical Engineer
Project Site Engineer – Mandani Bay Suites
Property Engineer – Jones Lang LaSalle Phil. Inc.
Regular contributor for FNX-Solar
*All photos displayed are from the Cab Construction Services office located at Mandaue City, Cebu, Philippines project
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