Electrical Safety[1] 73n49

Module 7 – Introduction to 2009 PEC I Module 8 – Grounded and Ungrounded System Module 9 - Fire Pumps

Jaime V. Mendoza, PEE, MTM Member Board of Electrical Engineering Chairman Distribution Management Committee, ERC

2

Module 7 – Introduction to 2009 Philippine Electrical Code Part I Introduction Purpose Basic Code rules, Important Definitions Why do Code rules changes? Requirements for Electrical Installations Working Space around Electrical Equipment Electrical Shock & Potential Difference

Carmelray Industrial Park I Canlubang, Calamba, Laguna

Electrical Safety Seminar for Jollibee‘s Personnel

3

Safe Electrical Installations?



4

2009 Philippine Electrical Code It

is NOT a textbook.

It

gives NO background, reasons, application or illustration of rules and regulations set down in the Code.

The

code is more of a catalogue of rules for an electrical installation.

The

Code definition of term is NOT the same as a definition for the same word in a standard dictionary. Carmelray Industrial Park I Canlubang, Calamba, Laguna


5

2009 Philippine Electrical Code

Historical Background The first documented case of a Code as a requirement of rules was published on 16th Nov. 1881 entitled “The Dangers of Electric Lighting”. The first NEC was developed in 1897, eighteen after the invention of incandescent light bulb by Thomas A. Edison. Since 1911, the NFPA of Quincy, Massachussets, has been responsible for the maintenance and publication of the NEC. Regularly revised (every three years) to reflect the evolution of products, materials, and installation techniques. 21 Separate Committee, each consisting of 15-20 persons. of each committee meet several times, discuss proposed changes, accepting some and rejecting others, and rewrite (as required) the sections of the Code that were assigned to their committee. The 2009 PEC used the 2005 Edition of the National Electrical Code as referenced Code.



6


Purpose The primary objective of the code is to establish basic materials quality and electrical works standards for the safe use of electricity for light, heat, power, communications, signaling and for other purposes. “Practical safeguarding of persons and property from hazards arising from the use of electricity” COMPLIANCE TO THE PEC WILL ENSURE SAFETY AND PREVENT ELECTRICAL FIRES Carmelray Industrial Park I Canlubang, Calamba, Laguna


7

2009 Philippine Electrical Code Intention

NOT intended as a design specification or an instruction manual for untrained persons. • The term untrained persons can be interpreted to mean anyone who does NOT have an understanding of electricity and electrical construction. • It can also mean that the Code assumes a person reading or studying it knows and understands basic Ohm Law, Kirchoff’s Law, the triangle of fire, etc.



8

Qualified Person



9

2009 Philippine Electrical Code The PEC is a safety standard, NOT a design guide. Electrical designs must comply with the requirements of PEC to ensure safety.

Electrical Safety Standard - PEC

Energy management, maintenance, and power quality issues aren’t within the scope of the PEC. Consideration should be given for future expansion of electrical systems but this is not a Code requirement. Carmelray Industrial Park I Canlubang, Calamba, Laguna


10


Scope Covered- the installation of electrical conductors, equipment, and raceways, monitoring, signaling, and communications conductors, equipment, and raceways; and optical fibers and raceways installed within or on, to from: • • • • • • • • • • • • • •

Public and private buildings. Electric Gen. Plants Industrial plants Transformer stations Permanent & Temporary S/s Airfields Railways switchyard Yards, carnival, parks, parking and other lots Quarries and mines Watercraft Dockyards Trailers Mobile Homes and recreational vehicles Offshore facilities



11


Not covered Installations in railway rolling stock, aircraft, or automotive vehicles Installations of railways for generation, transformation, transmission, or distribution of power used exclusively for operation of transmission stock

Interpretation The Board of Electrical Engineering shall render the final decision in the interpretation of any portion of the PEC, in case of controversy.



12


Classification of Code Rules 1. Wiring Design Rules 2. Installation Rules 3. Manufacturing Rules



13

2009 Philippine Electrical Code CLASSIFICATION OF CODE RULES Wiring design rules used to determine sizes and rating of circuit conductors and devices. Example: 1. Branch circuit conductors supplying a single motor shall have an ampacity not less than 125% of the full-load current. Section 4.30.2.2 2. The disconnecting means for motor circuits shall have an ampere rating of at least 115% of the full-load current rating of the motor. Section 4.30.10.10(a) Carmelray Industrial Park I Canlubang, Calamba, Laguna


14

2009 Philippine Electrical Code CLASSIFICATION OF CODE RULES

Installation rules Example: 1. A disconnecting means shall be located within sight from the motor controller. Section 4.30.102 2. In class II Division I Locations, motors, generators, and other rotating electric machinery shall be dust ignition proof or totally enclosed pipe ventilated and shall be approved for class II locations. Sections 5.02.8 Carmelray Industrial Park I Canlubang, Calamba, Laguna


15

2009 Philippine Electrical Code CLASSIFICATION OF CODE RULES Manufacturing rules Example: Section 4.30.1.7 A motor shall information:

be

marked

with

the

following

1) Manufacturer’s Name 2) Rated Volts and Full-load Amperes 3) Rated Frequency and Number of Phases, if an alternating current motor, etc. 4) Rated full-load speed Carmelray Industrial Park I Canlubang, Calamba, Laguna


16


Various Categories of the Code Rules which apply in a Motor and the Circuits Carmelray Industrial Park I Canlubang, Calamba, Laguna


17

Components that Create a Fire or Explosion

In the Installation Rules , one element of the Triangle of Fire is removed to make the installation safe. Carmelray Industrial Park I Canlubang, Calamba, Laguna


18

2009 Philippine Electrical Code Why

do Code Rules Change?

–Existing provisions became unsafe –New technologies –New products –New methods or techniques (needs for E) Carmelray Industrial Park I Canlubang, Calamba, Laguna


19


do Code Rules Changes?

–Existing provisions became unsafe

w/ Adaptor



20



–Existing provisions became unsafe



21



–New technologies • PVC – Polyvinyl Chloride Conduit • Non-metallic Conduit » equipment grounding conductors



22



–New products •GFCI and AFCI a) Dwelling Units (GFCI) 1. Bathrooms 2. Garages 3. Outdoors 4. Crawl spaces at or below grade level 5. Unfinished basements 6. Kitchens for countertop appliances 7. Wet bar sinks



23



–New methods or techniques Plywood



24

2009 Philippine Electrical Code Type

of Changes

1. New Provision/Definition 2. Revision 3. Relocated 4. Reorganization 5. Universal Change 6. Deletion (310.5)



25

2009 Philippine Electrical Code New

Definitions

AHJ – Authority Having Jurisdiction Bonding Jumper, System Coordination (Selective) Guest Rooms Guest Suite Handhole Enclosure Carmelray Industrial Park I Canlubang, Calamba, Laguna


26


New Provision 2.10.1.8(b)(2) –GFCI Protection Other than Dwelling Commercial and institutional kitchens – for the purposes of this section, a kitchen is an area with a sink and permanent facilities for food preparation and cooking. (Culinary Schools)



27

2009 Philippine Electrical Code New

Provision

2.10.1.8(b)(5) –GFCI Protection Other than Dwelling (5)Outdoor , where installed to comply with 2.10.3.14 Heating, Airconditioning, and Refrigeration Outlet



28

2009 Philippine Electrical Code Revised

-definition

Dwelling Unit – one or more rooms for the use of one or more persons as a housekeeping unit with space for eating, living, sleeping, and permanent provisions for cooking and sanitation. PEC 2000 Dwelling Unit – a single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation. (PEC 2009)



29

2009 Philippine Electrical Code Revised

2.10.1.8(a)(8) GCFI Protection Laundry, utility, and wet bar sinks – where the receptacles are installed to serve the countertop surfaces and are located within 1.8 m (6 ft) of the outside edge of the sink. Laundry, utility, and wet bar sinks – where the receptacles are installed within 1.8 m (6 ft) of the outside edge of the sink.



30

2009 Philippine Electrical Code Relocated

Solidly Grounded – PEC 2000 Grounded, Solidly – PEC 2009



31

Reorganization – Article 2.20 Branch-Circuit, Feeder, and Service Calculations 2000 Article 2.20 Part

2009 Article 2.20 Sections

Part

Sections

I. General

2.20.1.1- 4

I. General

2.20.1.1 -5

II. Feeders and Services

2.20.2.1 - 14

II. Branch Circuit 2.20.2.1 - 7 Load Calculations

III. Optional 2.20.3.1 - 7 Calculations for Computing Feeder and Service Loads

III. Feeder and Service Load Calculations

2.20.3.1 - 23

IV. Method for 2.20.4.1 - 2 Computing Farm Loads

IV. Optional Feeder2.20.4.1 - 9 And Service Load Calculations V. Farm Calculation 2.20.5.1- 4



32


Universal Change

A universal change throughout the Code is the replacement of “computed load” and “demand load” with “calculated load.” For example, the term demand load is being replaced with calculated load to improve clarity and to reduce confusion, especially when related to “calculated load” and “demand factor.” The term calculated load includes demand factor, the concepts of diversity, and historical data.



33

Receptacles A.

Tamper-Resistant Receptacles in Dwellings Unit (NEC 2008 - 406.11) Why do you think it is a tamperresistant receptacle?

..To increase safety for children.

..maybe that your son, daughter, or grandchildren that you will save



34

Tamper-Resistant Receptacles

Insertion of an object in any one side does not open the shutter (left), but a two-bladed plug or grounding plug compresses the Spring and simultaneously opens both shutters (right) Carmelray Industrial Park I Canlubang, Calamba, Laguna


35

Accessible, Readily Accessible, Readily



36

Accessible, Readily



37

Not Located in Bathrooms

Overcurrent protection devices must not be located in the bathrooms of dwelling units, or in guest rooms or guest suites of hotels or motels.(2.40.2.5 Carmelray Industrial Park I Canlubang, Calamba, Laguna


38

Vertical Position

Enclosures for overcurrent devices must be mounted In a vertical position, unless this isn’t practical. (2.40.3.3) Carmelray Industrial Park I Canlubang, Calamba, Laguna


39

Accessible

Accessible (as applied to equipment) – itting close approach; not guarded by locked doors, elevation, or other effective means. Carmelray Industrial Park I Canlubang, Calamba, Laguna


40

Within Sight



41

Overcurrent



42

Wiring Methods



43

Wiring Methods



44

Wiring Methods



45

Receptacles General

Receptacle Placement 210.52(A)



46

Receptacles Maximum

Distance to a Receptacle

210.52(A)(1)



47

Receptacles Wall

Spaces 600 mm (2 ft) in Width210.52(A)(2)(1)



48

Receptacles Receptacle

placement in a kitchen



49

Extension Cords



50

Clothes Closes Luminaires



51

Clothes Closes Luminaires



52

Luminaire as Raceway



53

Decorative Lightings

Faulty or inadequate decorative lighting causes the majority of Christmas tree fires. ( Do not used indoor Christmas lights for outside or outdoor decorative lightings.) Carmelray Industrial Park I Canlubang, Calamba, Laguna


54

Faulty Wirings?

BUNDLED NONNON-CONDUITED WIRES ON A STEEL TRUSS Carmelray Industrial Park I Canlubang, Calamba, Laguna


55

Faulty Wirings?



56

1.10 Requirement for Electrical Installations 1.10.1.2 Approval of Equipment



57

Electrical Installation



58

1.10.1.10 Circuit Impedance



59

Short-Circuit Current Rating



60

Short-Circuit Current Rating



61

1.10.1.11 Deteriorating Agents



62

1.10.1.12 Mechanical Execution of Work a)

Unused Openings

b)

Subsurface Enclosures

c)

Conductors must be racked to provide ready and safe access in underground and subsurface enclosures into which persons enter for installation and maintenance.

Integrity of Electrical Equipment and Connections



63

1.10.1.12 Mechanical Execution of Work (a) Unused Openings

Unused cable or raceway openings must be closed with a fitting that provides equivalent protection. Carmelray Industrial Park I Canlubang, Calamba, Laguna


64

1.10.1.12 Mechanical Execution of Work (a) Unused Openings



65

1.10.1.12 Mechanical Execution of Work 1.10.1.12(c) Integrity of Electrical Equipment and Connections

Internal parts of electrical equipment must be covered to avoid damage from paint or other substances. Carmelray Industrial Park I Canlubang, Calamba, Laguna


66

1.10.1.12 Mechanical Execution of Work 1.10.1.12(c) Integrity of Electrical Equipment and Connections Integrity of Electrical Equipment Section 1.10.1.12 ( C )



67

1.10.1.14 Conductor Termination



68




69




70




71


Conductors must be spliced by a listing splicing device and they are NOT required to be twisted together prior to the installation of a twist-on wire connector. Carmelray Industrial Park I Canlubang, Calamba, Laguna


72


Twist-on Connectors



73

1.10.1.22 Identification of Disconnecting Means



74

1.10.2.1 Spaces about Electrical Equipment



75

1.10.2.1(a) Spaces about Electrical Equipment



76




77




78


Example of the 30 inch minimum working space at the rear of equipment to allow work on nonelectrical parts, such as the replacement of an air filter, Carmelray Industrial Park I Canlubang, Calamba, Laguna


79


Permitted reduction from a Cond. 3 to a Cond. 2 Clearance according to 1.10.2.1(a)© Carmelray Industrial Park I Canlubang, Calamba, Laguna


80




81




82




83


Unacceptable arrangement of a large switchboard. A person could be trapped behind arcing electrical equipment. Carmelray Industrial Park I Canlubang, Calamba, Laguna


84




85




86

1.10.2.1(d) Illumination



87

1.10.2.1(f) Dedicated Equipment Space



88




89




90

1.10.2.2(b) Prevention of Physical Damage



91




92

Electric Shock

Electric shock is the physical simulation or trauma that occurs as a result of electric current ing through the body. Carmelray Industrial Park I Canlubang, Calamba, Laguna


93

Electric Shock

Human completing the path for current the earth Carmelray Industrial Park I Canlubang, Calamba, Laguna

Human in parallel with equipment grounding conductor during ground fault


94

Electric Shock

Electric Shock Severity

1.

Path of Current through Body

2.

Length of Time Current Flows

3.

Amount of Current through Body



95

Electric Shock

Current flow through body tissues delivers energy in the form of heat. The magnitude of energy may be approximated by

J = I2Rt where J = energy, joules I = current, amperes R = resistance of the current path through the body, ohms t = time of current flow, seconds



96

Effects of AC Electric Shock

ELCB!!!

Level (in milliamperes) of current through the body Carmelray Industrial Park I Canlubang, Calamba, Laguna


97

Potential Difference

Potential difference between a grounded Water pipe and an ungrounded motor. Carmelray Industrial Park I Canlubang, Calamba, Laguna


98


Motor ground-fault. A hazard now exists.



99


The hazard results in an electric shock. Carmelray Industrial Park I Canlubang, Calamba, Laguna


100


Another shock hazard exists. Carmelray Industrial Park I Canlubang, Calamba, Laguna


101


Shock hazard eliminated by installing a bonding jumper. Carmelray Industrial Park I Canlubang, Calamba, Laguna


102

Module 8 – Grounded and Ungrounded System A.

Grounded Systems 1) 2) 3) 4)

Electrical System Grounding Grounding of Electrical Equipment Bonding of Electrical Equipment Bonding of Electrically Conductive Materials and Other Equipment 5) Effective Ground-Fault Current Path B.

Ungrounded Systems 1) Grounding of Electrical Equipment 2) Bonding of Electrical Equipment 3) Bonding of Electrically Conductive Materials and Other Equipment 4) Path for Fault Current Carmelray Industrial Park I Canlubang, Calamba, Laguna


103

Grounded and Ungrounded System Sec. 250.1.4 is divided into two parts

Part A – Grounded System Carmelray Industrial Park I Canlubang, Calamba, Laguna

Part B – Ungrounded System Electrical Safety Seminar for Jollibee‘s Personnel

104

2.50.2.7 Conductor to be Grounded – AC Systems



105

2.50.1.4 General Requirements for Grounding & Bonding



106

2.50.1.4 General Requirements for Grounding & Bonding A.

Grounded Systems

1.

Electrical System GroundingElectrical systems that are grounded shall be connected to earth in a manner that will limit the voltage imposed by lightning, line surges, or unintentional with higher voltage lines and that will stabilize the voltage to earth during normal operation. Carmelray Industrial Park I Canlubang, Calamba, Laguna


107

Lightning Theory



108


Grounded Systems

2.

Grounding of Electrical Equipment – Normally non-currentcarrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected to earth so as to limit the voltage to ground on these materials.



109


Grounded Systems

3.

Bonding of Electrical Equipment – Normally non-currentcarrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.



110

2.50.1.4 General Requirements for Grounding & Bonding A. Grounded Systems 4. Bonding of Electrically Conductive Materials and Other Equipment – Normally non-currentcarrying conductive materials that are likely to become energized shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.



111


Grounded Systems 5. Effective Ground-Fault Current Path Electrical equipment, wiring, and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the overcurrent device or ground detector for high impedance grounded systems. It shall be capable of safely carrying the maximum groundfault current likely to be imposed on it from any point on the wiring system where a ground fault may occur to the eletrical supply source. The earth shall NOT be considered as an effective ground fault current path.



112

2.50.1.4 General Requirements for Grounding & Bonding



113

Earth is Not an Effective Ground-Fault Current Path



114

2.50.1.4 General Requirements for Grounding & Bonding B.

Ungrounded Systems 1.

2.

Grounding of Electrical Equipment Normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected to earth in a manner that will limit the voltage imposed by lightning or unintentional with higher – voltage lines and limit the voltage to ground on these materials. Bonding of Electrical Equipment Normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the supply system grounded equipment in a manner that creates a lowimpedance path for ground-fault current that is capable of carrying the maximum fault current likely to be imposed on it.



115


Ungrounded Systems 2. Bonding of Electrical Equipment



116


Ungrounded Systems 3. Bonding of Electrically Conductive Materials and Other Equipment Electrically conductive materials that are likely to become energized shall be connected together and to the supply system grounded equipment in a manner that creates a lowimpedance path for ground-fault current that is capable of carrying the maximum fault current likely to be imposed on it.

4. Path for Fault Current Electrical equipment, wiring, and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the overcurrent device or ground detector for high impedance grounded systems. It shall be capable of safely carrying the maximum ground-fault current likely to be imposed on it from any point on the wiring system where a ground fault may occur to the electrical supply source. The earth shall not be considered as an effective ground fault current path. Carmelray Industrial Park I Canlubang, Calamba, Laguna


117

2.50.1.6 Objectionable Current Over Grounding Conductors A.

Arrangement to Prevent Objectionable Current The grounding of electrical systems, circuit conductors, surge arresters, surge protective devices, and conductive normally non-current-carrying metal parts of equipment shall be installed and arranged in a manner that will prevent objectionable current over the grounding conductors or grounding paths.



118

2.50.1.6 Objectionable Current Over Grounding Conductors A.

Preventing Objectionable Current To prevent a fire, electric shock, or improper operation of circuitprotection devices or sensitive equipment, electrical systems and equipment must be installed in a manner that prevents objectionable current from flowing on conductive materials, electrical equipment, or grounding and bonding paths. Carmelray Industrial Park I Canlubang, Calamba, Laguna


119

2.50.1.6(A) Objectionable Current Over Grounding Conductors



120




121




122




123




124




125




126

2.50.1.6 Objectionable Current Over Grounding Conductors C.

Temporary Currents Not Classified as Objectionable Current Temporary current resulting from accidental conditions, such as ground faults, shall not be classified as objectionable current for the purposes specified in 250.6(A) and (B). Carmelray Industrial Park I Canlubang, Calamba, Laguna


127

2.50.1.6 Objectionable Current Over Grounding Conductors



128

2.50.1.6 Objectionable Current Over Grounding Conductors D.

Limitations to Permissible Alterations The provision of this section shall not be considered as permitting electronic equipment for being operated on AC systems or branch circuits that are not connected to an equipment grounding conductor as required by this article. Currents that introduce noise or data errors in electronic equipment shall NOT be considered the objectionable currents addressed in this section.


Section 2.50.1.6(d)


129

2.50.1.6 Objectionable Current Over Grounding Conductors D.

Limitations to Permissible Alterations The provision of this section shall not be considered as permitting electronic equipment for being operated on AC systems or branch circuits that are not connected to an equipment grounding conductor as required by this article. Currents that introduce noise or data errors in electronic equipment shall not be considered the objectionable currents addressed in this section.



130

Types of Grounding

System Grounding

Equipment Grounding

These two are kept separate except at the point where they receive their source of power, such as at the service equipment or at a separately derived system!!!



131

2.50.2 System Grounding 2.50.2.1 AC Systems to be Grounded A.

AC System of Less than 50 Volts shall be grounded under any of the ff. conditions where: 1)

Supplied by transformers, if the transformer supply exceeds 250 V to ground

2)

Supplied by transformers, if the transformer supply is ungrounded

3)

Installed outside as overheads


250 V


132

2.50.2 System Grounding 2.50.2.1 AC Systems to be Grounded B.

AC systems of 50 V to 1000 V that supply premises wiring and premises wiring systems shall be grounded under any of the ff conditions, where the system: 1) Can be grounded so that the maximum voltage to ground on the ungrounded conductors does not exceed 250 V: 240 V – 1 phase, 120/240 V -1-phase, 3 wire and 208/120 V, 3-phase, 4-wire 2) Is 3-phase, 4-wire, wye-connected in which the neutral conductor is used as a circuit conductor: 208/120 V, 3phase, 4-wire, and 480/277 V, 3-phase, 4-wire 3) Is 3-phase, 4-wire, delta-connected in which the midpoint of one phase winding is used as a circuit conductor: 120/240 V, 3-phase, 4-wire, and 240/480 V, 3-phase, 4-wire Carmelray Industrial Park I Canlubang, Calamba, Laguna


133

2.50.2.1(B) Systems rated 50 to 1000 V that are required to be grounded

25 0V



134

2.50.2.1(B) Systems rated 50 to 1000 V that are required to be grounded

250 V



135

2.50.2.1(c) AC Systems of 1 kV & Over

AC systems supplying mobile or portable equipment shall be grounded as specified in 2.50.10.9. Where supplying other than mobile or portable equipment, such systems shall be permitted to be grounded. Carmelray Industrial Park I Canlubang, Calamba, Laguna


136

2.50.2.1(D) Separately Derived Systems



137

2.50.2.1(d) Separately Derived Systems



138

2.50.2.1(e) Impedance Grounded Neutral Systems Impedance

grounded neutral systems shall be grounded in accordance with 2.50.2.17 or 2.50.10.7



139

2.50.2.2 AC Systems of 50 to 1000 V NOT required to be Grounded

2.50.2.1(b)



140

2.50.2.2 Ground Detectors

Ungrounded AC systems as permitted in 2.50.2.2(1) to ((4) operating at Not less than 120 V and Not exceeding 1000 V shall have ground detectors installed on the system. Ground Detectors (lights)



141

2.50.2.2 Ground Detectors

All relays and alarm Circuitry not shown Ground detection is required on ungrounded systems Carmelray Industrial Park I Canlubang, Calamba, Laguna


142

2.50.2.5 Grounding ServiceSupplied AC Systems

250.24(A) System Grounding Connections A premises wiring system supplied by a grounded AC service is required to have a grounding electrode conductor connected to the grounded service conductor , at each service, in accordance with 250.24(a)(1) through (A)(5).



143

2.50.2.5 Grounding ServiceSupplied AC Systems 250.24(a)(1)

General

The grounding electrode conductor connection is required to be made at any accessible point from the load end of the service drop or service lateral to and including the terminal bus to which the grounded service conductor is connected at the service disconnecting means. Carmelray Industrial Park I Canlubang, Calamba, Laguna


144

2.50.2.5(a)(1) General

Grounding electrode conductor connection at accessible location


Grounding electrode conductor connection in wireway


145

2.50.2.5 (a)(2) Outdoor Transformer

Where the transformer supplying the service is located outside the building, at least one additional grounding connection is required to be made from the grounded service conductor to a grounding electrode, either at the transformer or elsewhere outside the building. Carmelray Industrial Park I Canlubang, Calamba, Laguna

WHY?


146

Module 9- Fire Pumps

The general philosophy behind Code articles is that circuit protection will shut down equipment before letting the supply conductors melt from overload.

Art. 6.95 Fire Pumps depart from this philosophy.

The idea is that the fire pump motor must run, no matter what; it supplies water to facility’s fire protection piping, which in turn supplies water to the sprinkler system and fire hoses. Carmelray Industrial Park I Canlubang, Calamba, Laguna


147

6.95.1.1 Scope a)

Covered 1) Electric power sources and interconnecting circuits 2) Switching and control equipment dedicated to fire pump drivers

b) Not Covered 1) The performance, maintenance, and acceptance testing of the fire pump system, and the internal wiring of the components of the system 2) Pressure maintenance (jockey or makeup) pumps



148

6.95.1.3 Power Sources for Electric-Motor Driven Fire Pumps a)

Individual Source 1) Electric Utility Service. A separate service from a connection located ahead of but not within the service disconnecting means. 2) On-Site Power. An on-site power supply, such as generator, located and protected to minimize damage by fire is permitted to supply a fire pump.



149

6.95.1.3 Power Sources for Electric-Motor Driven Fire Pumps

a) Electric-Utility Service Connection Carmelray Industrial Park I Canlubang, Calamba, Laguna


150


a) Electric-Utility Service Connection Carmelray Industrial Park I Canlubang, Calamba, Laguna


151


2) On-Site Power Production Facility Carmelray Industrial Park I Canlubang, Calamba, Laguna


152

6.95.1.3 Power Sources for Electric-Motor Driven Fire Pumps b)

Multiple Sources 1) Generator Capacity. Shall have sufficient capacity to allow normal starting and running 0f the motor(s) driving the fire pump(s) while supplying other simultaneously operated load. 2) Feeder Sources. 3) Arrangement. The power sources shall be arranged so that a fire at one will not cause an interruption at the other source.



153


2) Feeder Sources Carmelray Industrial Park I Canlubang, Calamba, Laguna


154

6.95.1.5 Transformers

Dedicated transformer and overcurrent protection sizing can be broken down into three requirements. 1. The transformer must be size to at least 125% of the sum of the loads. 2. The transformer primary overcurrent device must be at least a specified minimum size. 3. The transformer secondary must not contain any overcurrent device whatsoever. Carmelray Industrial Park I Canlubang, Calamba, Laguna


155

6.95.1.5 Transformers

The overcurrent device in the primary of a transformer supplying a fire pump installation. The device is required to be sized to carry the locked-rotor current motor(s) and associated fire pump accessory equipment indefinitely. Carmelray Industrial Park I Canlubang, Calamba, Laguna


156

6.95.1.6 Power Wiring a)

Service and Feeder Conductors. Supply conductors must be physically routed outside buildings and must be installed in accordance with Article 2.30. Where supply conductors cannot be routed outside buildings, they must be encased in 2 inches or 50 mm of concrete or brick.



157

6.95.1.6 Power Wiring b) Circuit Conductors. Fire pump supply conductors on the load side of the final disconnecting means and overcurrent device(s) must be kept entirely independent of all other wiring. They can be routed through a building using one of the following methods: 1) Be encased in a minimum 2 inches or 50 mm of concrete 2) Be within an enclosed construction dedicated to the fire pump circuit(s) and having a minimum of a 1-hour fireresistant rating 3) Be listed electrical circuit protective system with a minimum 1-hour fire rating.



158

6.95.1.6(c)(2) BC Conductor Size Fire Pump Motor Branch Circuit Conductor Size From Table 4.30.14.5(b)

Branch circuit conductors to a single fire pump motor must have a rating not less than 125% of the motor FLC as listed in Table 4.30.14.2 or 4.30.14.4 Carmelray Industrial Park I Canlubang, Calamba, Laguna


159

6.95.1.7 Voltage Drop

The voltage drop at the line terminals of the controller when the motor starts (locked-rotor current), must not drop more than 15% below the controller’s rated voltage. Carmelray Industrial Park I Canlubang, Calamba, Laguna


160

6.95.1.7 Voltage Drop Fire Pump Motor – Voltage Drop



161

6.95.1.7 Voltage Drop Fire Pump Conductor Size – Voltage Drop



162

Thank You !!!! &

GOOD Morning! Carmelray Industrial Park I Canlubang, Calamba, Laguna


Electrical Safety[1] 73n49

Overview 5o1f4z

More details 6z3438

Related Documents c2h70

Electrical 4f69

Electrical 4f69

Electrical Design/electrical Project Training/electrical System Design/ 5w1573

Electrical Symbols.pdf 2h5en

Electrical Plans 4x44x

Electrical Dwgs z5j3c