IMPEDANZ ERTC INSTITUTE OF INTEGRATED ELECTRICAL ENGINEERING SOUTHERN CAVITE CHAPTER Engineering, Review, Training & Consultancy SPEAKER: ENGR. JAIME A. PACO , PEE, MM-EM, CPM, CEM DIRECTOR, IMPEDANZ ERTC www.impedanzengineering.com | email@example.com | PCAB & DOLE Accredited About the Speaker ENGR. JAIME A. PACO • • • • • • • • • • • • • • • • • • • Professional Electrical Engineer ASEAN Certified Energy Manager, CEM Master of Engineering Management Certified Plant Mechanic Director/Lecturer, Impedanz Engineering Review, Training & Consultancy Electrical Consultant of Several Companies in CALABARZON IIEE Lifetime and Senior Member IIEE RME Affairs Committee Member (2012, 2013) IIEE Electoral Process Committee Member (2016) President, IIEE Central Laguna Chapter (2015) Adviser, IIEE Central Laguna Chapter (2016 to present) Member, Rotary Club of Calamba Member, Mechatronics and Robotics Society of the Phils. (MRSP) Member, PSME (Phil. Society of Mechanical Engineers) – Central Laguna Member, Institute of Electrical and Electronics Engineer (IEEE - USA) Member, VP for Internal, Phil. Integrated Fire Protection Org. (2020 Laguna) FEATI University, BSEE Batch 87, University Scholar Former Faculty Member (Letran, Lyceum, Malayan-MAPUA of Laguna) Former Faculty Member (De La Salle University Lipa, Perpetual) “PEC PROVISIONS FOR ELECTRICAL SYSTEM DESIGN” ABSTRACT The Electrical System of any facilities must be designed and installed in accordance with the latest edition of Philippine Electrical Code for it to become safe and reliable. This webinar will tackle significant provisions of PEC for Electrical System Design. This includes not only sizing of CB or feeders but also requirements on installation of panelboards, GFCI circuit breakers, electrical equipment space requirements, services, grounding, etc. This is an interesting 3-hour presentation of PEC Provisions with the sharing of Lecturer’s experiences; Join us! PHILIPPINE ELECTRICAL CODE 2017 2017 edition: The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. This Code is intended as a design specification or an instruction manual to qualified persons. PHILIPPINE ELECTRICAL CODE (PEC) 2017 THE KEY WORD IS: SAFETY KNOWLEDGE CHECK ✔ When is the Electrical Safety month? READING PEC PROVISIONS Chapter Chapter Article Part Section 18.104.22.168 General Requirements for Grounding and Bonding Section 22.214.171.124 Article 6.95 Fire Pumps Article 6.95 SECTION 126.96.36.199 Electrical Permit Needed Before Work is Started What is the latest version Of Philippine Electrical Code? TOTAL CONNECTED LOAD ____________ KVA Design: PEE “REE/RME must have PTR” In-charge: PEE/REE/RME Source: Municipal Government PEC ARTICLE 1.2 – PERMITS AND INSPECTION CERTIFICATES Section 188.8.131.52 – Requirements for Electrical Permit Signature and Submittals (A) Electrical Permit shall include the ff minimum information: 1. Applicant 2. PEE who signed and sealed plans and specification with photocopy of PTR and valid PRC license. 3. Licensed Electrical Practitioner incharge of electrical works, with photocopy of PTR and valid PRC license. 4. Building Owner 5. Lot Owner 6. Building Official All Plans and Permit must be signed by the OWNER. All Plans and Permit must be signed and sealed by PEE. Submit copy of PEE’s valid PRC license with PTR. Submit copy of REE/RME valid PRC license with PTR. ( for in-charge of Electrical Works) KNOWLEDGE CHECK ✔ How many copies of Plans must be submitted for permit application? (B) Five 5 sets of electrical plans and specs signed and sealed by PEE to maximum of 7 sets, 1 copy for Contractor 1 copy for Owner We need to submit documents to Office of the Building Official (OBO) for permit approval. (before start of Construction, so that) We will know if our design is correct and in compliance with PEC. (Documents – Electrical Permit and set of Plans) Use cable with “W” in Insulation W – Moisture Resistant SECTION 184.108.40.206 POSTING OF ELECTRICAL PERMIT A copy of electrical permit, upon issuance, shall be posted at a conspicuous location at the job site and shall not be removed until final inspection and approval of the work shall have been made. LEP in-charge of design and in-charge of installation shall post a copy of their valid PRC license together with the electrical permit at all times. Must indicate the following: • • • • • Building Permit Number Contractor Engineering Professionals PEE Design Engineer PEE/REE/RME In-Charge of Electrical Installations ARTICLE 1.3 ELECTRICAL PLANS AND SPECIFICATIONS 220.127.116.11 Drawing Sheets (A)Electrical plans and drawings shall be drawn on drawing sheets of the following standard sizes: 760mm x 1000mm 600mm x 900mm 500mm x 760mm 297mm x 420mm - 24 in x 36 in - A1 - 16 in x 24 in - A2 - 12 in x 16 in - A3 (A)For dwelling unit having a floor area of not more than 50 sq. meters with a total load not exceeding 3680 VA, a drawing sheet of A3 is permitted. 297mm x 420mm - 12 in x 16 in - A3 REMINDER: PLANS SHOULD BE READABLE KNOWLEDGE CHECK ✔ Where to put Design Analysis? ARTICLE 1.3, PART 1.3.2 PLANS AND SPECIFICATIONS Part 1.3.2 (F) Design Analysis Design Analysis shall be included on the drawings or shall be submitted on a separate sheets of standard size, and shall show: (1) Branch circuits, sub-feeders, feeders, busways and service entrance; (2) Types, ratings, and trip settings of overload protective devices; Brand: Type: Rating: kAIC Rating: Air Circuit Breaker 2000 A 85 (3) Calculation of voltage drops VD = 𝟑 𝑰 𝒁 𝒍𝒆𝒏𝒈𝒕𝒉 𝒊𝒏 𝒎𝒆𝒕𝒆𝒓𝒔 𝟏 ( )( ) 𝟑𝟎𝟓 𝒎𝒆𝒕𝒆𝒓𝒔 𝒏𝒐.𝒐𝒇 𝒔𝒆𝒕𝒔 SAMPLE VOLTAGE DROP CALCULATION Given: 10 HP, 230V, 3PH Squirrel Cage Induction Motor, Distance from Power Panel = 15m Computation: From PEC: VD = 1.732 (Amps) ( Z ) ( L / 305m ) ( 1 / no. of parallel paths ) VD = 1.732 (28A) (1.1 ohms) (15m / 305m) ( 1 / 1 set) VD = 2.62 V %VD = (VD / 230 V)(100%) = (2.62 V / 230 V)(100%) %VD = 1.14 % (4) Calculation of short circuit current for determining the interrupting capacity of overcurrent protective device for residential, commercial, and industrial establishment; We do short circuit calculation by manual computation or using Software. kAIC RATING KNOWLEDGE CHECK ✔ What is the meaning of FPN in PEC? FPN means FINE-PRINT NOTES – It supplements the article rules, they are not part of the requirements but for information and explanation purposes only. N FPN No. 1: This analysis is not required for dwelling units but required for service equipment and other electrical equipment not part of individual dwelling units of residential condominiums and individual detached dwelling units 15 Amp Residential CB usually has 8 to 10kAIC rating (5) Protection coordination of overcurrent protective devices; Time Current Curve of Circuit Breaker (TCC) (6) Arc-Flash Hazard Analysis to determine the required Personal Protective Equipment (PPE) in other than dwelling place – (see Appendix H for PPE) FPN No. 2: Arc-flash Hazard Analysis required is intended for concerned parties to be informed and made aware of the importance of Personal Protective Equipment (PPE) and its type for the flash hazard risk category determined by the analysis Calculation of Incident Energy PPE CATEGORY PPE CATEGORY ARTICLE 1.10 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS The Criteria for Examination of Electrical Inspection: 1. Suitability for the installation 2. Mechanical strength and durability 3. Wire bending and connection space 4. Electrical insulation 5. Heating effects produced by the equipment under normal and abnormal condition of use. 6. Arcing effects 7. Class, type, size, voltage, ampacity, specific use of equipment. NEMA 3R STAINLESS ENCLOSURE LEARNINGS: 1. 2. 3. 4. 5. 6. Electrical permit is required before start of construction. Plans and Permit must be signed by Owner and PEE Aside from Electrical Plans, Short Circuit Analysis is required Short Circuit Analysis is not required for dwelling units Short Circuit Analysis is conducted to determine kAIC rating of CB Voltage Drop Calculation and Cable color coding is new addition to Schedule of Loads 7. Arc-flash analysis is used to determine PPE required 8. Arc-flash sticker is required on Electrical Panel 9. Protection Coordination reduces downtime hence increase productivity. REQUIREMENTS FOR ELECTRICAL INSTALLATIONS Section 18.104.22.168 Spaces About Electrical Equipment • Width of Working Space The work space shall permit at least 90 degree opening of equipment doors or hinged panels. REQUIREMENTS FOR ELECTRICAL INSTALLATIONS Section 22.214.171.124 Spaces About Electrical Equipment • Entrance to Working Space a) Large equipment - equipment rated 1200 amperes or more shall have at least one entrance. 600 mm wide and 2000 mm high. b) Headroom - The minimum headroom of working spaces about service equipment, switchboards, panel boards, or motor control centers shall be 2000 mm. 126.96.36.199 Spaces About Electrical Equipment: Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment CHAPTER 2. WIRING AND PROTECTION Means of identifying Grounding Conductors A.) Sizes 14mm2 or Smaller - Continuous white - Continuous gray outer finish - Three continuous white or gray stripes along the conductor’s entire length on other than green insulation. Equipment Grounding Conductors are NON-CURRENT carrying conductors CHAPTER 2. WIRING AND PROTECTION Means of identifying Grounding Conductors B.) Sizes Larger than 22mm2 - Continuous white or gray outer finish. - Three continuous white stripes along it entire length other than green insulation - At the times of installation, distinctive white or gray marking at its terminations. This marking shall encircle the conductor or insulation. ARTICLE 2.10 BRANCH CIRCUITS RATING: A.) IN GENERAL – The rating for other than individual branch circuits shall be 15,20, 30, 40, and 50 A. B.) OVER 50 AMPERES – Multi-outlet branch circuits greater than 50A shall be permitted to supply nonlighting over outlet loads. Ground Fault Circuit Interrupter Protection (GFCI) a) Dwelling Units - All 125/250 volts, single phase, 15-20 amperes receptacles installed in the following locations shall be of GFCI protection: 1. Bathrooms 2. Garages 3. Outdoors 4. Crawl spaces - at or below grade level 5. Unfinished basements 6. Kitchen 7. Laundry circuits, and wet bar sinks 8. Boathouses PART 2.10.2 BRANCH-CIRCUITS RATINGS 1. In General - Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. Branch circuit conductors which supplies continuous load and combination thereof shall have an ampacity not less than 125% of the continuous load. LEARNINGS: 1. Door opening for Electrical Panel must be 90 degrees 2. Electrical Panelboards must be readily accessible with enough working space for safety. 3. Equipment grounding conductor is colored green 4. System grounding conductor is colored white 5. GFCI type of CB is required for damp or wet location 6. Branch circuit conductor shall have ampacity of 125% of the load 7. Branch circuit conductor shall be loaded up to 80% of it’s ampacity PART 2.10.2 BRANCH-CIRCUITS RATINGS 2. Household Ranges and Cooking Appliances – Fore ranges of 8 ¾ kW or more rating, shall have a minimum-branch circuit rating 40 amperes. Branch Circuits requiring at least 20A Overcurrent Protection 1. Small Appliance Branch Circuits 2. Laundry Branch Circuits 3. Bathroom Branch Circuits 4. Dwelling Unit (50 m2) not more than 3680VA 20A (80%) = 16A 16A (230V) = 3680 VA Section 188.8.131.52 A (1) Cord-and-Plug- Connected Equipment Not Fastened in Place. The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating. c\ 80% of 20A is 16A ARTICLE 2.15 FEEDERS Minimum Rating and Size a) In General - Feeders shall have an allowable ampacity not less than the noncontinuous load plus 125% of the continuous load Continuous load - a load where the maximum current is expected to continue for 3 hours or more. Improper Cable Grouping “BE CAREFUL NOT TO DAMAGE THE CABLE INSULATION DURING CONSTRUCTION” FEEDERS must have proper cable groupings. Each conduit must have L1, L2, L3, (plus N or G depending on requirements) Example: Dwelling units with 50 sq. meters area, The general lighting load is: 50 sq.mx 24VA/ sq.m. = 1200 VA : KNOWLEDGE CHECK ✔ What is the meaning of Demand Factor? Demand Factor is defined as the ratio of maximum demand over connected load Connected load = 6000VA Maximum demand = 3000VA Demand Factor = (3000/6000) = 0.5 or 50% KNOWLEDGE CHECK ✔ What is the advantage of applying correct demand factors? Correct demand factors allows you to use a smaller size of cable. Table 184.108.40.206 Optional Feeder and Service Load Calculations Heating and Air-Conditioning Load a) 100% - Air-Conditioning and Cooling b) 100% - Heat Pump without any Supplementary Electric Heating c) 100% - Electrical Thermal Storage d) 100% - Heat Pump Compressor and 65% - Supplemental Electric Heating e) 65% - Electric Space Heating less than 4 Controlled Units f) 40% - Electric Space Heating for 4 or more Controlled Units Conductor Size and Supports a) Overhead Spans - Individual conductors shall not be smaller than the following: 1. For 600 volts, nominal, or less 1. 15m Length - 5.5 mm2 (2.6 mm. dia.) copper and 8.0 mm2 (3.2 mm. dia.) aluminum 2. Longer than 15m - 8.0 mm2 (3.2 mm. dia.) copper and 14 mm2 aluminum OUTSIDE BRANCH CIRCUITS & FEEDERS 2. For over 600 volts 1. Open Individual Conductors - 14 mm2 copper and 22 mm2 aluminum 2. Conductors in Cable - 8.0 mm2 (3.2 mm. dia.) copper and 14 mm2 aluminum b) Festoon Lighting - Overhead conductors for festoon lighting shall not be smaller than 3.5 mm2 unless the conductors are supported by messenger wirings. OPEN CONDUCTOR SPACING (CLEARANCES) – FEEDERS AND CONDUCTORS Conductor on Poles - Shall have a separation of not less than 300 mm where not placed on racks or brackets. a) Power conductors below communications conductors - 750 mm b) Power conductors alone or above communications conductors: 1. 300V or less - 600 mm 2. Over 300V- 750 mm c) Communications conductors below power conductors - Same OVERHEAD SERVICE Buildings or Structures requiring Additional Feeders/Service Entrance: a) Special Conditions - Additional feeder or branch circuits shall be permitted to the ff. 1. Fire pumps (high pressure) for the building 2. Emergency systems 3. Legally required standby systems 4. Optional standby systems 5. Parallel power production systems 6. Multiple sources of supply for the purpose of enhanced reliability b) Special Occupancies - By special permission, additional feeder or branch circuit shall be permitted: 1. Multiple-occupancy buildings where there is no available space for service equipment accessible to all occupancies. 2. A single building/structure sufficiently large to make two or more supplies necessary. c) Capacity Requirements - Where the capacity requirements are in excess of 2000 amperes at a supply voltage of 600V or less d) Different Characteristics - Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for different rate schedules. e) By Identification Clearance of Service Lateral: a) 600 mm - directly buried cable b) 150 mm - RMC or IMC installation c) 450 mm - PVC approved for direct burial without concrete encasement d) 450 mm - other approved raceway for direct burial KNOWLEDGE CHECK ✔ What is the general rule in the installation of SERVICES? ARTICLE 2.30 - SERVICES General Rule: ONE service to ONE building ARTICLE 2.30 - SERVICES SERVICE The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served. ARTICLE 2.30 - SERVICES A building must be served by only one service except the following: (a) Special Conditions 1. Fire pumps 2. Emergency systems 3. Legally required standby systems 4. Optional standby systems 5. Parallel power production Systems 6. Multiple sources of supply for the purpose of enhanced reliability What type of conduit is in the picture? What is the PEC KNOWLEDGE CHECK ✔ COMMENT YOUR ANSWERS Article number of FIRE Pumps? ARTICLE 6.95 FIRE PUMPS FIRE PUMP CONTROLLER has NO thermal overload relay. ARTICLE 2.30 - SERVICES (b) Special Occupancies 1. Multiple occupancy building Where no available space for service equipment accessible to all occupants ARTICLE 2.30 - SERVICES (b) Special Occupancies 2. Single building or group of single detached buildings large to make two or more service necessary ARTICLE 2.30 - SERVICES (c) Capacity requirements 1. Where the capacity requirements are in excess of 2000 A at a supply voltage of 1000 volts or less 2. Where the load requirements of a single-phase installation are greater than the serving agency normally supplies through one service ARTICLE 2.30 - SERVICES (d.) Different characteristics - For different voltages, frequencies, or phases, or for different uses, such as for different rate schedules As defined by PEC: OVERHEAD – service conductors between the service point and the first point of connection to the service entrance conductors at the building or other structure. As defined by PEC: UNDERGROUND – service conductors between the service point and the first point of connection to the service entrance conductors in a terminal box, or other enclosure inside or outside the building wall. Part 2.30.2 Overhead Service Conductors Service Drop - The overhead conductors between the utility electric supply system and the service point. (B) Vertical Clearance for Overhead Service Conductors 3000mm - above finished grade, sidewalks, pedestrians property where voltages does not exceed 150V. 3700mm – over residential property, driveways, and commercial areas where voltages does not exceed 300V to ground. 4500mm – for those areas listed in 3700mm classification where exceed 300V to ground. 4500mm – over public streets, alleys, roads, parking areas subject to truck traffic, driveways other than residential, other land such as cultivated, grazing, forest and orchard 7500mm – over tracks of railroads Part 2.30.3 Underground Service Conductors SERVICE LATERAL The underground service conductors between the utility electric supply system and the service point. Minimum Size 8.0 mm2 Copper or 14.0 mm2 Aluminum or Copper-clad aluminum SERVICE CABLE - conductors made up in the form a cable. SERVICE CONDUCTORS – conductors from the service point to the service disconnecting means. (F) Drip loops. It shall be formed on individual conductors. Part 2.30.5 Service Equipment The necessary equipment usually consisting of a circuit breakers or switches and fuses and their accessories, connected to the load end of service conductors to a building or other structure. Intended to constitute the main control and cutoff the supply. SERVICE POINT The point of connection between the facilities of the serving utility and the premises wiring. DISCONNECTING MEANS General: Disconnecting Means shall be provided to disconnect all conductors in a building or other structure from the service – entrance conductors. 220.127.116.11 GROUPING OF DISCONNECTS MAXIMUM (SIX) 6 DISCONNECTING MEANS The general rule is a maximum of six (6) service disconnecting means can be installed in one location - without the need of a main service disconnecting means ahead of these. SERVICE ENTRANCE INSTALLATION ARTICLE 3.0 GENERAL REQUIREMENTS FOR WIRING METHODS AND MATERIALS TYPES OF WIRING METHODS 1. 2. 3. 4. 5. 6. Rigid Steel Conduit (RSC) Intermediate Metallic Conduit (IMC) Electrical Metallic Tubing (EMT) Flexible Metallic Conduit (Armored Cable) PVC Conduit Flexible Non-Metallic Conduit Minimum size of Conduit = 15mm dia. Maximum size of Conduit = 100 mm dia. PEC Table 18.104.22.168(B)(16): Cable Ampacity Source: PEC 2017, page 174 CONDUCTOR INSULATION DESCRIPTION TEMPERATURE RATING TW Moisture Resistant Thermoplastic 60°C THW Moisture & Heat Resistant Thermoplastic 75°C THHN Thermoplastic High-Heat Resistant NylonCoated 90°C THWN Thermoplastic Heat and Water Resistant 75°C THWN - 2 Thermoplastic Heat and Water Resistant 90°C Source: PEC 2017, page 174 Source: PEC 2017, page 174 PEC Table 22.214.171.124(A): Standard Ampere Ratings for Fuses and Inverse Time Circuit Source: PEC 2017, page 86 It is very important in the design of branch circuit. A continuous load shall not exceed 80% of the rating of the branch circuit. This means that for a 20A rated circuit at 80% = 16A would be the maximum load on the circuit if it was continuously loaded for 3 hours or more. PEC Table 126.96.36.199(B)(16): Ampacity Adjustment Factor When there are more than three current-carrying conductors in a raceway or cable, the ampacity of each conductor must be reduced as indicated in the given table to compensate for heating effects and reduced heat dissipation due to reduced ventilation of individual conductors. Sample Computation to determine the number of Outlets Number of Outlets = (Nominal V)(CB x 80%) Volt-Ampere Number of Outlets = (230V)(20A x 80%) 180VA Number of Outlets = 20 outlets Sample Computation to determine the number of Lamps Number of lamps = (Nominal V)(CB x 80%) W Number of lamps = (230V)(15A x 80%) 100W Number of Lamps = 27 lamps Article 3.10 – Conductors for General Wiring (H) Conductors in Parallel For FEEDER installation, We start paralleling at 50mm2 Stranded Conductors - The conductors installed in raceways, size 8.0 mm and larger shall be stranded. 2 Conductors in Parallel - Conductors that are 50 mm sq. and larger (aluminum, copper-clad aluminum, copper) are permitted to be in parallel. Parallel conductors in each phase, polarity, neutral/grounded circuit conductors shall comply with the ff: 1. Be the same length 2. Have the same conductor material 3. Be the same cross sectional area of the conducting material 4. Have the same insulation type 5. Be terminated in the same manner ARTICLE 2.50 GROUNDING AND BONDING ARTICLE 2.50 GROUNDING AND BONDING GROUNDING – connecting to earth or to some conducting body that serves in place of the earth. BONDING – connected to establish electrical continuity and conductivity. Section 188.8.131.52 - General Requirements for Grounding and Bonding a) Electrical System Grounding - Shall have connections that limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines that will stabilize the voltage to earth. b) Grounding of Electrical Equipment - Non-current carrying conductive materials, electrical conductors, or equipment shall be connected to earth so as to limit the voltage to ground. c) Bonding of Electrical Equipment - Non-current carrying conductive materials forming part of such equipment connected together establishing an ―effective ground-fault current path”. Connection of Grounding and Bonding Equipment a) Connected by exothermic welding, listed pressure contactors, listed clamps. b) Connection devices or fittings that depend solely on solders shall not be used. c) Sheet metal screws shall not be used. d) Non-conductive coatings shall be removed such as paint, lacquer, and enamel. exothermic welding PEC Table 184.108.40.206 Grounding Electrode Conductor For AlternatingCurrent Systems SIZING OF MOTOR’S OVER CURRENT PROTECTION KNOWLEDGE CHECK ✔ COMMENT YOUR ANSWERS KNOWLEDGE CHECK ✔ COMMENT YOUR ANSWERS HOW TO SIZE CB AND FEEDERS FOR GROUP OF MOTORS? TRANSFORMER PROTECTION PRIMARY PROTECTION (BASED ON PRIMARY CURRENT GREATER THAN 9 AMPS) CB = 125% X Primary Current ARTICLE 4.40 AIR-CONDITIONING AND REFRIGERATING EQUIPMENT Branch Circuit Conductors Single Motor-Compressor - Compressors shall have a rating of 125% ampacity of the full-load current. Wye-Start, Delta-Run Connected Motor-Compressor - Shall have a rating of 72% ampacity of the full-load rated current. AIRCONDITIONING AND REFRIGERATING EQUIPMENT OUR LEARNINGS - Electrical permit is required before the start of electrical installation - Building wiring installations must be in compliance with the latest edition of the Philippine Electrical Code - Proper clearances must be observed in installing service entrance - General Rule: One Service is to One Building only - Size 50mm2 and larger shall be permitted to be connected in parallel. - Wires and cables must be loaded up to 80% of its ampacity - Wires and cables must be installed inside a conduit, cable tray or ducting for protection OUR LEARNINGS - Derating factors must be applied on cable ampacity based on wiring methods and ambient temperature - Proper color coding must be observed and placed on schedule of loads voltage drop is required on design and must be placed on schedule of loads - Proper enclosure specifications must be used on the required environment - Conduits and panel boards must be properly supported and must have mechanical strength - Grounding and Bonding is required on electrical installations KNOWLEDGE CHECK ✔ COMMENT YOUR ANSWERS Who initiated the revisions of PEC 2009? REFERENCES - Philippine Electrical Code (2017 Ed.) - National Electrical Code Handbook IMPEDANZ ERTC IS NOW A SAFETY TRAINING ORGANIZATION (STO) ENGR. JAIME A. PACO, PEE Director/Lecturer JOIN OUR SAFETY TRAININGS! JOIN OUR SAFETY TEAM! INSTITUTE OF INTEGRATED ELECTRICAL ENGINEERS IMPEDANZ REVIEW CENTER “enhancing knowledge & skills” #tEEm1SLR #CovEEd-Webinar-Series IMPEDANZ ERTC IS NOW A SAFETY TRAINING ORGANIZATION (STO) ENGR. JAIME A. PACO, PEE Director/Lecturer JOIN OUR SAFETY TRAININGS! JOIN OUR SAFETY TEAM!