Introduction to Fluorescent and Incandescent Light Fixtures Inspection

1- Introduction


In this course you will learn:


  • How to inspect fluorescent lighting fixtures and incandescent lighting fixtures (Fig.1),
  • How to identify the correct fixture to be inspected,
  • How to verify that the fixture is properly installed,
  • How to document your inspection results.


This course will reference the National Electric Code (NEC) and Underwriters Laboratory (UL) documents.



Fig.1: Fluorescent and Incandescent Lighting Fixtures




2- Verify that the Correct Fixture is being inspected


First: Incandescent Light Fixtures


  • The incandescent lamp consists of a filament which is a highly refractory conductor mounted in a transparent or translucent glass bulb and provided with a suitable electrically connecting base. The filament is heated by the passage of an electric current through it to such a high temperature that it becomes incandescent and emits light. The older types of bulbs had the air inside of them removed. The modern lamps today have this space filled with an inert transparent gas such as nitrogen.
  • (Fig.2) shows porcelain, single lamp, incandescent light fixture and a lamp. When the lamp is attached, the fixture operates as a common unit. The incandescent light fixture can be designed to hold one of several types of lamps. This type of fixture is used with a screw—type lamp base or cap. 


Fig.2: A Standard Incandescent Light Fixture and a Lamp



  • The incandescent lamp is widely used in many applications and often seen in the home. The life expectancy of an incandescent lamp is much less than a fluorescent lamp. The incandescent lamp is identified by the filament. The filament is made from a metallic material called tungsten. (Fig.3) shows a heavy duty lamp used for construction work.


Fig.3: Basic Construction of a Standard Incandescent Lamp






Classification of incandescent Lamps
Incandescent lamps can be classified in six different ways, according to:

  1. The class of lamp,
  2. The type of the base,
  3. The shape of the bulb,
  4. The type of filament,
  5. The finish of the bulb,
  6. The type of service.



1- Class of lamp
  • Lamps are classified as either Type B or Type C. 
  • The Type B lamp is one in which all the air has been removed. 
  • The Type C is one which is gas-filled. Gas-filled lamps are the most widely used types.



2- The type of base
  • A number of different types of bases for incandescent lamps are in use (fig.4).



Fig.4: Standard Incandescent Lamp Bases

  • The medium base, used on general-service lamps of 300 watts and less, is the most common type. 
  • The mogul base is used for 300 watts and above.  
  • Other popular bases are the bayonet, candelabra, and intermediate bases are used on small size (miniature) lamps.






3- Shape of bulb
Incandescent lamps come in various shapes and sizes (fig.5), all designated by a letter or letters followed by a number. The letter is to identify the lamp's shape while the numerical designation is to identify the diameter of the lamp in an eighth of an inch. 


Fig.5: Standard Incandescent Lamp Shapes


Example: 

Lamp model 60A19, means :

60: Wattage (60 W) 
A: Bulb shape 
19: Maximum bulb diameter, in eighths of an inch. (19 ÷ 8 = 2.38 in)
  • The most common shape for incandescent lamps and the one everyone knows is the A shape (A-19) - The A is only an arbitrary designation. 
  • The below table include the most used shape codes for Incandescent lamps.



Code
Name
Use
A
Arbitrary (standard)
universal use for home lighting
B
Bullet
decorative
BR
Bulging reflector
for substitution of incandescent R lamps
C
Cone shape
used mostly for small appliances and indicator lamps
ER
Elliptical reflector
for substitution of incandescent R lamps
F
Flame
decorative interior lighting
G
Globe
ornamental lighting and some floodlights
P
Pear
standard for streetcar and locomotive headlights
PAR
Parabolic aluminized
used in spotlight and floodlight reflector
S
Straight
lower wattage lamps - sign and decorative
T
Tubular
showcase and appliance lighting


4- Bulb finishes
Incandescent bulbs can be finished in a variety of different ways. Some of the more popular ones are listed below:
  1. Clear,
  2. Inside-colored,
  3. Inside-frosted,
  4. Outside-colored,
  5. Silvered bowl,
  6. Colored-glass,
  7. White,
  8. Outside-coating,
  9. Daylight.



5- Type of filament
Several different types of filament structures are used (fig.6). The filament structure is designated by a letter or letters to indicate whether the wire is straight or coiled and by an arbitrary number sometimes followed by a letter to indicate the arrangement of the filament on the supports. Prefix letters include:
S =    straight; wire is straight or slightly corrugated
C =    coil; wire is wound into a helical coil or it may be deeply fluted.
CC = Coiled coils; wire is wound into a helical coil, and this coil wire is again wound into a helical coil.



Fig.6: Standard Incandescent Lamp Filaments 


The below table include the most Common Filament types for Incandescent lamps.



Designation
Description
C-2F
 Short, coiled filament requiring two supports.
C-2R
 Short, coiled curbed filament requiring no support.
C-2V
 Short, coiled filament requiring support.
CC-2V
 Short, double-coiled filament requiring support.
C-5
 Concentrated filament for small light sources.
C-6
 Short, coiled filament requiring little or no support.
CC-6
 Short, double-coiled filament requiring few supports.
2C-6
 Two short, coiled filaments requiring little or no support mounted one on top of the other.
C-7
 Long filament supported at the top for base up usage.
C-7A
 Long filament supported at the top and at the base for universal usage.
C-8
 Coiled filament mounted in lamp axis. Can be extended like Lumiline lamps.
CC-8
 Short, double-coiled filament mounted in the lamp axis.
2CC-8
 Two short, double-coiled filaments mounted in the lamp axis.
C-9
 Average length filament mounted in the lamp axis.
CC-9
 Average length double-coiled filament mounted in the lamp axis.
C-11
 Average length, concentrated filament. Well supported, "M" Shape.
C-13
 Flat, very concentrated filament for projection equipment.
CC-13
 Flat, very concentrated double-coiled filament for projection equipment.
C-17
 Long filament requiring more support than usual.







6- Type of service
Incandescent bulbs are manufactured for a wide range of services, most of which can be classified into three categories:
  • General lighting service: These are the most common bulbs used   for general lighting.
  • Special lighting service: This group includes the three-way bulbs, daylight lamps, and decorative lamps.
  • Miscellaneous lighting service: Street lighting, traffic-signal lamps,            and photographic lamps fall into this category. The overhead projector lamp is also included in this group.
Previous
Next Post »
My photo

Hi, I`m Sostenes, Electrical Technician and PLC`S Programmer.
Everyday I`m exploring the world of Electrical to find better solution for Automation. I believe everyday can become a Electrician with the right learning materials.
My goal with BLOG is to help you learn Electrical.
Related Posts Plugin for WordPress, Blogger...

Label

KITAIFA NEWS KIMATAIFA MICHEZO BURUDANI SIASA TECHNICAL ARTICLES f HAPA KAZI TU. LEKULE TV EDITORIALS ARTICLES DC DIGITAL ROBOTICS SEMICONDUCTORS MAKALA GENERATOR GALLERY AC EXPERIMENTS MANUFACTURING-ENGINEERING MAGAZETI REFERENCE IOT FUNDAMENTAL OF ELECTRICITY ELECTRONICS ELECTRICAL ENGINEER MEASUREMENT VIDEO ZANZIBAR YETU TRANSDUCER & SENSOR MITINDO ARDUINO RENEWABLE ENERGY AUTOMOBILE SYNCHRONOUS GENERATOR ELECTRICAL DISTRIBUTION CABLES DIGITAL ELECTRONICS AUTOMOTIVE PROTECTION SOLAR TEARDOWN DIODE AND CIRCUITS BASIC ELECTRICAL ELECTRONICS MOTOR SWITCHES CIRCUIT BREAKERS MICROCONTROLLER CIRCUITS THEORY PANEL BUILDING ELECTRONICS DEVICES MIRACLES SWITCHGEAR ANALOG MOBILE DEVICES CAMERA TECHNOLOGY GENERATION WEARABLES BATTERIES COMMUNICATION FREE CIRCUITS INDUSTRIAL AUTOMATION SPECIAL MACHINES ELECTRICAL SAFETY ENERGY EFFIDIENCY-BUILDING DRONE NUCLEAR ENERGY CONTROL SYSTEM FILTER`S SMATRPHONE BIOGAS POWER TANZIA BELT CONVEYOR MATERIAL HANDLING RELAY ELECTRICAL INSTRUMENTS PLC`S TRANSFORMER AC CIRCUITS CIRCUIT SCHEMATIC SYMBOLS DDISCRETE SEMICONDUCTOR CIRCUITS WIND POWER C.B DEVICES DC CIRCUITS DIODES AND RECTIFIERS FUSE SPECIAL TRANSFORMER THERMAL POWER PLANT cartoon CELL CHEMISTRY EARTHING SYSTEM ELECTRIC LAMP ENERGY SOURCE FUNDAMENTAL OF ELECTRICITY 2 BIPOLAR JUNCTION TRANSISTOR 555 TIMER CIRCUITS AUTOCAD C PROGRAMMING HYDRO POWER LOGIC GATES OPERATIONAL AMPLIFIER`S SOLID-STATE DEVICE THEORRY DEFECE & MILITARY FLUORESCENT LAMP HOME AUTOMATION INDUSTRIAL ROBOTICS ANDROID COMPUTER ELECTRICAL DRIVES GROUNDING SYSTEM BLUETOOTH CALCULUS REFERENCE DC METERING CIRCUITS DC NETWORK ANALYSIS ELECTRICAL SAFETY TIPS ELECTRICIAN SCHOOL ELECTRON TUBES FUNDAMENTAL OF ELECTRICITY 1 INDUCTION MACHINES INSULATIONS ALGEBRA REFERENCE HMI[Human Interface Machines] INDUCTION MOTOR KARNAUGH MAPPING USEUL EQUIATIONS AND CONVERSION FACTOR ANALOG INTEGRATED CIRCUITS BASIC CONCEPTS AND TEST EQUIPMENTS DIGITAL COMMUNICATION DIGITAL-ANALOG CONVERSION ELECTRICAL SOFTWARE GAS TURBINE ILLUMINATION OHM`S LAW POWER ELECTRONICS THYRISTOR USB AUDIO BOOLEAN ALGEBRA DIGITAL INTEGRATED CIRCUITS FUNDAMENTAL OF ELECTRICITY 3 PHYSICS OF CONDUCTORS AND INSULATORS SPECIAL MOTOR STEAM POWER PLANTS TESTING TRANSMISION LINE C-BISCUIT CAPACITORS COMBINATION LOGIC FUNCTION COMPLEX NUMBERS ELECTRICAL LAWS HMI[HUMANI INTERFACE MACHINES INVERTER LADDER DIAGRAM MULTIVIBRATORS RC AND L/R TIME CONSTANTS SCADA SERIES AND PARALLEL CIRCUITS USING THE SPICE CIRCUIT SIMULATION PROGRAM AMPLIFIERS AND ACTIVE DEVICES BASIC CONCEPTS OF ELECTRICITY CONDUCTOR AND INSULATORS TABLES CONDUITS FITTING AND SUPPORTS CONTROL MOTION ELECTRICAL INSTRUMENTATION SIGNALS ELECTRICAL TOOLS INDUCTORS LiDAR MAGNETISM AND ELECTROMAGNETISM PLYPHASE AC CIRCUITS RECLOSER SAFE LIVING WITH GAS AND LPG SAFETY CLOTHING STEPPER MOTOR SYNCHRONOUS MOTOR AC METRING CIRCUITS APPS & SOFTWARE BASIC AC THEORY BECOME AN ELECTRICIAN BINARY ARITHMETIC BUSHING DIGITAL STORAGE MEMROY ELECTRICIAN JOBS HEAT ENGINES HOME THEATER INPECTIONS LIGHT SABER MOSFET NUMERATION SYSTEM POWER FACTORS REACTANCE AND IMPEDANCE INDUCTIVE RESONANCE SCIENTIFIC NOTATION AND METRIC PREFIXES SULFURIC ACID TROUBLESHOOTING TROUBLESHOOTING-THEORY & PRACTICE 12C BUS APPLE BATTERIES AND POWER SYSTEMS ELECTROMECHANICAL RELAYS ENERGY EFFICIENCY-LIGHT INDUSTRIAL SAFETY EQUIPMENTS MEGGER MXED-FREQUENCY AC SIGNALS PRINCIPLE OF DIGITAL COMPUTING QUESTIONS REACTANCE AND IMPEDANCE-CAPATIVE RECTIFIER AND CONVERTERS SEQUENTIAL CIRCUITS SERRIES-PARALLEL COMBINATION CIRCUITS SHIFT REGISTERS BUILDING SERVICES COMPRESSOR CRANES DC MOTOR DRIVES DIVIDER CIRCUIT AND KIRCHHOFF`S LAW ELECTRICAL DISTRIBUTION EQUIPMENTS 1 ELECTRICAL DISTRIBUTION EQUIPMENTS B ELECTRICAL TOOL KIT ELECTRICIAN JOB DESCRIPTION LAPTOP THERMOCOUPLE TRIGONOMENTRY REFERENCE UART WIRELESS BIOMASS CONTACTOR ELECTRIC ILLUMINATION ELECTRICAL SAFETY TRAINING FILTER DESIGN HARDWARE INDUSTRIAL DRIVES JUNCTION FIELD-EFFECT TRANSISTORS NASA NUCLEAR POWER SCIENCE VALVE WWE oscilloscope 3D TECHNOLOGIES COLOR CODES ELECTRIC TRACTION FEATURED FLEXIBLE ELECTRONICS FLUKE GEARMOTORS INTRODUCTION LASSER MATERIAL PID PUMP SEAL ELECTRICIAN CAREER ELECTRICITY SUPPLY AND DISTRIBUTION MUSIC NEUTRAL PERIODIC TABLES OF THE ELEMENTS POLYPHASE AC CIRCUITS PROJECTS REATORS SATELLITE STAR DELTA VIBRATION WATERPROOF