Part Two - Designing Electrical Systems Vol. 1

Switchboards are designed with busbars for fuses or circuit breakers that are used for protecting and supplying feeders and branch circuits. Panelboards are designed with a permanently installed main circuit breaker or single set of fuses for disconnecting the number of circuit breakers or fuseholders installed to protect and supply feeders or branch circuits.

SUPPORT AND ARRANGEMENT OF BUSBARS AND CONDUCTORS
408.3

Busbars shall be held firmly in place in the enclosure and shall be arranged in such a way to allow adequate space for conductors to be terminated. Busbars shall be sized with enough capacity to handle the normal currents in amps of the electrical system. In addition, they shall carry safely any type of short-circuit or ground-fault condition.

CONDUCTORS AND BUSBARS ON A SWITCHBOARD OR PANELBOARD
408.3(A)

Conductors and busbars on a switchboard, panelboard, or control board shall be so located as to be free from physical damage. Service sections of such boards shall be separated from the other electrical components. These components shall be properly secured in an approved manner. 

Note, conductors entering a certain section shall terminate in such section, except where it is not practical for control, interconnecting conductors, or other conditions of use.

OVERHEATING AND INDUCTIVE HEATING
408.3(B)

The arrangement of busbars and conductors shall be such as to avoid overheating due to inductive effects. The inductive effect of each conductor is neutralized when grouping all conductors together. To accomplish the minimizing of heating effects, the ungrounded (phase) conductors, grounded (neutral) conductors, and equipment grounding conductors, where used, shall be in the same enclosure, raceway, cable, cord, etc. (See Figure 7-1)

• 课时1：OVERHEATING AND INDUCTIVE HEATING - 408.3(B) (4分31秒)

• 课时2：USED AS SERVICE EQUIPMENT - 408.3(C) (8分19秒)

• 课时3：PHASE ARRANGEMENT - 408.3(E) AND (F)​​​​​​​ (3分14秒)

• 课时4：PHASE ARRANGEMENT - 408.3(E) AND (F) (3分39秒)

• 课时5：5 (6分20秒)

• 课时6：HIGH LEG IDENTIFICATION - 408.3(F)(1) (3分42秒)

• 课时7：MINIMUM WIRE-BENDING SPACE - 408.3(G) (3分43秒)

• 课时8：MINIMUM WIRE-BENDING SPACE - 408.3(G) (2分12秒)

• 课时9：CLEARANCE FOR CONDUCTOR ENTERING BUS ENCLOSURES - 408.5 (3分26秒)

• 课时10：DEDICATED EQUIPMENT SPACE - 408.18(B) AND 110.26(E)(1)(a) (5分30秒)

• 课时11：PANELBOARDS AND SWITCHBOARDS - ARTICLE 408, PART II (3分39秒)

• 课时12：SWITCHBOARD CLEARANCES - 408.18(A) AND (B)​​​​​​​ (1分50秒)

• 课时13：OVERCURRENT PROTECTION - 408.36 (1分45秒)

• 课时14：OVERCURRENT PROTECTION - 408.36 (1分53秒)

• 课时15：OVERCURRENT PROTECTION - 408.36 (3分49秒)

• 课时16：SPLIT-BUS PANELBOARD (3分8秒)

• 课时17：SNAP SWITCHES RATED AT 30 AMPS OR LESS - 408.36(A) (4分38秒)

• 课时18：SUPPLIED THROUGH A TRANSFORMER - 408.36(B) (4分29秒)

• 课时19：GROUNDING OF PANELBOARDS - 408.40 (5分37秒)

• 课时20：GROUNDING OF PANELBOARDS - 408.40 (2分44秒)

• 课时21：ISOLATED EQUIPMENT GROUNDING CONDUCTOR - 408.40, Ex (3分50秒)

• 课时22：(a) RUNNING CIRCUITS TO COMPENSATE FOR HARMONIC CURRENTS (2分30秒)

• 课时23：(b) RUNNING CIRCUITS TO COMPENSATE FOR HARMONIC CURRENTS (3分8秒)

• 课时24：AMBIENT TEMPERATURE - 310.14(A)(3), IN 1(1)​​​​​​​ (4分41秒)

• 课时25：WHEN TO APPLY CORRECTION FACTORS - 310.14(A)(2), Ex (6分1秒)

• 课时26：DISSIPATION INTO AMBIENT MEDIUM - 310.14(A)(3), IN 1(3) (3分16秒)

• 课时27：MATCHING TEMPERATURE MARKINGS - 110.14(C)(1)(a) AND (C)(1)(b) (7分29秒)

• 课时28：WHEN TO APPLY ADJUSTMENT FACTORS - 310.15(C)(1) TO TABLES 0 – 2000 VOLTS (3分40秒)

• 课时29：EQUIPMENT GROUNDING CONDUCTORS - ARTICLE 100 AND 310.6(B) (3分34秒)

• 课时30：OVERCURRENT - ARTICLE 100, 240.3, AND 240.4 (3分25秒)

• 课时31：WHEN IS A NEUTRAL CURRENT-CARRYING - 310.15(E)(3) (3分38秒)

• 课时32：UNGROUNDED CONDUCTORS - 310.6(C) (4分24秒)

• 课时33：UNGROUNDED CONDUCTORS - 310.6(C)​​​​​​​ (2分22秒)

• 课时34：TERMINAL RATINGS - 110.14(C)(1)(a) AND (C)(1)(b) (5分57秒)

• 课时35：LONG- AND SHORT-TIME RATINGS OF CONDUCTORS - 310.14(A)(3) AND TABLE 310.16 (7分3秒)

• 课时36：THREE OR MORE CURRENT-CARRYING CONDUCTORS - 310.15(C)(1) TO AMPACITY TABLES 0 – 2000 VOLTS (3分14秒)

• 课时37：DERATING FOR AMBIENT TEMPERATURE CORRECTION FACTORS - TABLES 310.15(B)(1) AND (B)(2) (7分8秒)

• 课时38：(a) APPLYING BOTH DERATING FACTORS TABLE 310.15(C)(1) AND TABLES 310.15(B)(1) AND (B)(2)​​​​​​ (6分58秒)

• 课时39：(b) APPLYING BOTH DERATING FACTORS TABLE 310.15(C)(1) AND TABLES 310.15(B)(1) AND (B)(2) (5分9秒)

• 课时40：(c) APPLYING BOTH DERATING FACTORS TABLE 310.15(C)(1) AND TABLES 310.15(B)(1) AND (B)(2) (5分53秒)

• 课时41：APPLYING 50 PERCENT LOAD DIVERSITY FACTOR - TABLE B.310.14(B)(2)(11) (3分53秒)

• 课时42：BRANCH-CIRCUIT ELEMENTS - 422.10(A) AND (B), AND 422.11(A) THRU (G) (4分7秒)

• 课时43：(a) INDIVIDUAL CIRCUITS - 210.19(A)(1)(a), 210.1 AND 210.20(A) (2分50秒)

• 课时44：(b) INDIVIDUAL CIRCUITS - 210.19(A)(1)(a), 210.1 AND 210.20(A) (7分59秒)

• 课时45：CONDUCTORS IN PARALLEL - 310.10(G)​​​​​​​ (9分56秒)

• 课时46：CONDUCTOR CONSTRUCTIONS AND APPLICATIONS - 310.4 (7分24秒)

• 课时47：TYPICAL AMBIENT DESIGN TEMPERATURE - 1971 NEC (6分44秒)

• 课时48：DETERMINING CONDUCTOR AMPACITIES IN CABLES - TABLES 311.60(C)(77) THRU 311.60(C)(86) (7分59秒)

• 课时49：DETERMINING CONDUCTOR AMPACITIES IN DUCT BANKS - TABLES 311.60(C)(77) THRU 311.60(C)(86) (2分31秒)

• 课时50：DERATING DUE TO OBSTRUCTIONS - 311.60(C)(2)(a) TO TABLES 311.60(C)(77) THRU 311.60(C)(86) (5分2秒)

• 课时51：DERATING DUE TO OBSTRUCTIONS - 311.60(C)(2)(b) TO TABLES 311.60(C)(77) THRU 311.60(C)(86)​​​​​ (4分30秒)

• 课时52：RACEWAYS AND CABLES EXPOSED TO SUNLIGHT ON ROOFTOOPS - 310.15(B)(2) AND Ex (9分20秒)

• 课时53：PROTECTION OF EQUIPMENT - 240.3 AND TABLE 240.3 (4分1秒)

• 课时54：PROTECTION OF EQUIPMENT PROTECTION OF CONDUCTORS - 240.4 (3分7秒)

• 课时55：OVERCURRENT DEVICES RATED 800 AMPS OR LESS - 240.4(B)​​​​​​​ (6分55秒)

• 课时56：OVERCURRENT DEVICES RATED OVER 800 AMPS - 240.4(C) (5分21秒)

• 课时57：OTOR-OPERATED APPLIANCE CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (4分12秒)

• 课时58：(a) MOTOR AND MOTOR-CONTROL CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (10分18秒)

• 课时59：(b) MOTOR AND MOTOR-CONTROL CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (11分10秒)

• 课时60：(a) PHASE CONVERTER SUPPLY CONDUCTORS - 240.4(G) AND TABLE 240.4(G)​​​​​​​ (3分15秒)

• 课时61：(b) PHASE CONVERTER SUPPLY CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (3分5秒)

• 课时62：AIR-CONDITIONING AND REFRIGERATION EQUIPMENT CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (6分41秒)

• 课时63：(a) TRANSFORMER SECONDARY CONDUCTORS - 240.4(F)​​​​​​​ (4分7秒)

• 课时64：(b) TRANSFORMER SECONDARY CONDUCTORS - 240.4(F)​​​​​​​ (3分18秒)

• 课时65：(a) CAPACITOR CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (3分0秒)

• 课时66：(b) CAPACITOR CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (4分38秒)

• 课时67：ELECTRIC WELDER CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G)​​​​​​​ (3分53秒)

• 课时68：REMOTE-CONTROL, SIGNALING, AND POWER-LIMITED CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (4分45秒)

• 课时69：FIRE ALARM CIRCUIT CONDUCTORS - 240.4(G) AND TABLE 240.4(G) (4分35秒)

• 课时70：FIXTURE WIRE - 240.5(B)(2) (5分15秒)

• 课时71：EXTENSION CORD SETS - 240.5(B)(3) (6分6秒)

• 课时72：STANDARD AMPERE RATINGS - 240.6(A) AND TABLE 240.6(A) (5分50秒)

• 课时73：ADJUSTABLE TRIP CIRCUIT BREAKERS - 240.6(B) AND (C) (2分51秒)

• 课时74：SUPPLEMENTARY OVERCURRENT PROTECTION - 240.10 (3分37秒)

• 课时75：ELECTRICAL SYSTEM COORDINATION - 240.12 (2分37秒)

• 课时76：USING HANDLE TIES - 240.15(B) (3分49秒)

• 课时77：BRANCH-CIRCUIT CONDUCTORS - 240.21(A) (5分53秒)

• 课时78：(a) TAPS NOT OVER 10 FT (3 m) LONG - 240.21(B)(1) (4分54秒)

• 课时79：(b) TAPS NOT OVER 10 FT (3 m) LONG - 240.21(B)(1) (3分14秒)

• 课时80：TAPS NOT OVER 25 FT (7.5 m) LONG - 240.21(B)(2) (2分57秒)

• 课时81：(a) TAPS SUPPLYING A TRANSFORMER [PRIMARY PLUS SECONDARY NOT OVER 25 FT LONG]240.21(B)(3) ​​​​ (2分32秒)

• 课时82： (b) TAPS SUPPLYING A TRANSFORMER [PRIMARY PLUS SECONDARY NOT OVER 25 FT LONG] - 240.21(B)(3) (3分37秒)

• 课时83：(a) TAPS OVER 25 FT (7.5 m) LONG - 240.21(B)(4) (3分14秒)

• 课时84：(b) TAPS OVER 25 FT (7.5 m) LONG - 240.21(B)(4) ​​​​​​​ (2分14秒)

• 课时85：TRANSFORMER SECONDARY CONDUCTORS NOT OVER 10 FT (3 m) LONG - 240.21(C)(2) (5分6秒)

• 课时86：INDUSTRIAL INSTALLATION SECONDARY CONDUCTORS NOT OVER 25 FT (7.5 m) LONG - 240.21(C)(3) (5分6秒)

• 课时87：OUTSIDE SECONDARY CONDUCTORS - 240.21(C)(4)​​​​​​​ (4分18秒)

• 课时88：SERVICE CONDUCTORS - 240.21(D) (2分2秒)

• 课时89：USWAY TAPS - 240.21(E)​​​​​​​ (3分19秒)

• 课时90：(a) MOTOR CIRCUIT TAPS - 240.21(F) (6分34秒)

• 课时91：(b) MOTOR CIRCUIT TAPS - 240.21(F) (3分31秒)

• 课时92：CONDUCTORS FROM GENERATOR TERMINALS - 240.21(G) (4分33秒)

• 课时93：PROTECTED BY A DIFFERENTIAL RELAY - 240.92(C)(1)(2) (8分25秒)

• 课时94：GROUNDED (NEUTRAL) CONDUCTOR - 240.22 (3分22秒)

• 课时95：CHANGE IN SIZE OF GROUNDED (NEUTRAL) CONDUCTOR - 240.23 (5分20秒)

• 课时96：ACCESSIBILITY OF OVERCURRENT PROTECTION DEVICES - 240.24(A) (3分12秒)

• 课时97：ACCESSIBILITY OF OVERCURRENT PROTECTION DEVICES - 240.24(A) (3分26秒)

• 课时98：BRANCH-CIRCUIT OVERCURRENT DEVICES - 240.24(B)(2) (1分7秒)

• 课时99：SIZING - 210.20(A), 215.3, AND 230.42(A)(1) (4分49秒)

• 课时100：(a) SIZING - 210.20(A), 215.3, AND 230.42(A)(1)​​​​​​​ (2分16秒)

• 课时101：(b) SIZING - 210.20(A), 215.3, AND 230.42(A)(1) (2分37秒)

• 课时102：DISCONNECTING MEANS FOR FUSES - 240.40 (2分3秒)

• 课时103：SIZING - 210.20(A), 215.3, 230.42(A)(1), AND 230.90(A) (5分49秒)

• 课时104：MARKING - 240.83 (5分36秒)

• 课时105：CLEARING TIME - 230.95(A), 240.13, 210.13, AND 215.10 (5分45秒)

• 课时106：GROUND-FAULT PROTECTION FOR PERSONNEL - 590.6 (5分51秒)

• 课时107：(a) FEEDERS AND BRANCH CIRCUITS - 240.100(A) THRU (C) AND ARTICLE 100 (6分4秒)

• 课时108：(b) OVERCURRENT RELAYS AND CURRENT TRANSFORMERS - 240.100(A)(1) (2分56秒)

• 课时109：(c) OVERCURRENT RELAYS AND CURRENT TRANSFORMERS - 240.100(A)(1) (6分5秒)

• 课时110：(d) OVERCURRENT RELAYS AND CURRENT TRANSFORMERS - 240.100(A)(1) (4分2秒)

• 课时111：(a) ADDITIONAL REQUIREMENTS FOR FEEDERS - 240.101(A) AND (B) (3分59秒)

• 课时112：(b) ADDITIONAL REQUIREMENTS FOR FEEDERS - 240.101(A) AND (B) (5分16秒)

• 课时113：GROUNDING RECEPTACLES - 406.4(A) (6分47秒)

• 课时114：GROUNDING RECEPTACLES - 406.4(A)​​​​​​​ (4分29秒)

• 课时115：NONGROUNDING RECEPTACLES - 406.4(D)(2), (D)(3), AND Ex (2分57秒)

• 课时116：REPLACEMENT OF RECEPTACLES - 250.130(C)​​​​​​​ (6分8秒)

• 课时117：NUMBER ON A CIRCUIT - 210.11(A)​​​​​​​ (4分24秒)

• 课时118：NUMBER ON A CIRCUIT - 210.11(A)​​​​​​​ (5分47秒)

• 课时119：WALL RECEPTACLE OUTLETS - 210.52(A)(1) THRU (A)(4) (2分51秒)

• 课时120：WALL RECEPTACLE OUTLETS - 210.52(A)(1) THRU (A)(4)​​​​​​​ (3分6秒)

• 课时121：(a) WALL RECEPTACLE OUTLETS - 210.52(A)(1) THRU (A)(4) (2分40秒)

• 课时122：(b) WALL RECEPTACLE OUTLETS - 210.52(A)(1) THRU (A)(4) (1分56秒)

• 课时123：RECEPTACLE OUTLETS FOR SMALL-APPLIANCE CIRCUITS210.52(B), 210.52(C), 210.11(C)(1), & 220.52(A) (3分49秒)

• 课时124：RECEPTACLE OUTLETS FOR SMALL-APPLIANCE CIRCUITS210.52(B), 210.52(C), 210.11(C)(1), & 220.52(A) (2分16秒)

• 课时125：WALL COUNTERTOP SPACES - 210.52(C) AND (C)(1) (4分51秒)

• 课时126：ISLAND COUNTERTOP SPACES - 210.52(C)(2) (3分56秒)

• 课时127：RECEPTACLE OUTLETS IN BATHROOMS - 210.52(D)​​​​​​​ (3分42秒)

• 课时128：RECEPTACLE OUTLETS OUTDOORS - 210.52(E)​​​​​​​ (1分39秒)

• 课时129：LAUNDRY CIRCUIT - 210.52(F)​​​​​​​ (2分34秒)

• 课时130：RECEPTACLES IN BASEMENTS - 210.52(G) (2分21秒)

• 课时131：RECEPTACLES IN GARAGES - 210.52(G) (3分20秒)

• 课时132：RECEPTACLES IN HALLWAYS - 210.52(H) (1分5秒)

• 课时133：FOYERS - 210.52(I) (2分0秒)

• 课时134：GFCI PROTECTION OF RECEPTACLES - 210.8(A)(1) THRU (A)(10) (9分17秒)

• 课时135：PROTECTION IN BATHROOMS - 210.8(A)(1) (2分58秒)

• 课时136：PROTECTION IN GARAGES - 210.8(A)(2)​​​​​​​ (2分29秒)

• 课时137：PROTECTION IN ACCESSORY BUILDINGS - 210.8(A)(2) (2分6秒)

• 课时138：PROTECTION OUTDOORS - 210.8(A)(3) (3分8秒)

• 课时139：PROTECTION IN BASEMENTS AND CRAWL SPACES - 210.8(A)(4) AND 210.8(A)(5)​​​​​​​ (2分5秒)

• 课时140：PROTECTION OVER COUNTERTOPS - 210.8(A)(6) AND (A)(7)​​​​​​​ (4分33秒)

• 课时141：PROTECTION OVER COUNTERTOPS210.8(A)(6) AND (A)(7) (1分44秒)

• 课时142：PROTECTION FOR BOATHOUSES - 210.8(A)(8) AND 210.8(C) (1分5秒)

• 课时143：(a) PROTECTION FOR DWELLING UNITS - 210.8(A)(9), (A)(10), AND (A)(11) (2分3秒)

• 课时144： (b) PROTECTION FOR DWELLING UNITS - 210.8(A)(9), (A)(10), AND (A)(11) (3分40秒)

• 课时145：(a) PROTECTION AROUND SWIMMING POOLS - 680.22(A)(1) THRU (A)(5)​​​​​​​ (3分8秒)

• 课时146：(b) PROTECTION AROUND SWIMMING POOLS - 680.22(A)(1) THRU (A)(5)​​​​​​​ (1分26秒)

• 课时147：PROTECTION AROUND SWIMMING POOLS - 680.22(A)(1) THRU (A)(5) (1分19秒)

• 课时148：PROTECTION FOR STORABLE POOLS - 680.32 (3分18秒)

• 课时149：PROTECTION FOR SPAS OR HOT TUBS - 680.43(A)(1) AND (A)(2) (3分12秒)

• 课时150：PROTECTION FOR HYDROMASSAGE TUBS - 680.71 THRU 680.73 (3分29秒)

• 课时151：RECEPTACLES ON CONSTRUCTION SITES - 590.6(A) AND (B) (3分47秒)

• 课时152：RECEPTACLES ON CONSTRUCTION SITES - 590.6(A) AND (B) (3分38秒)

• 课时153：RECEPTACLES ON CONSTRUCTION SITES - 590.6(A) AND (B) (3分18秒)

• 课时154：RECEPTACLES ON CONSTRUCTION SITES - 590.6(A) AND (B) (4分10秒)

• 课时155：RECEPTACLES INSTALLED IN BATHROOMS OF COMMERCIAL AND INDUSTRIAL LOCATIONS - 210.8(B)(1) (2分38秒)

• 课时156：RECEPTACLES INSTALLED IN KITCHENS OF COMMERCIAL AND INDUSTRIAL BUILDINGS - 210.8(B)(2)​​​​​​​ (2分9秒)

• 课时157：RECEPTACLES INSTALLED ON ROOFTOPS OF COMMERCIAL AND INDUSTRIAL BUILDINGS - 210.8(B)(3)​​​​​​​ (2分54秒)

• 课时158：RECEPTACLES INSTALLED OUTDOORS - 210.8(B)(4) (2分45秒)

• 课时159：RECEPTACLE OUTLETS INSTALLED IN INDOOR WET LOCATIONS - 210.8(B)(6) (1分43秒)

• 课时160：LOCKER ROOMS WITH SHOWERS - 210.8(B)(7)​​​​​​​ (2分41秒)

• 课时161：GARAGES, SERVICE BAYS, AND SIMILAR AREAS - 210.8(B)(8)​​​​​​​ (2分2秒)

• 课时162：Receptacles in Seating Areas and Other Similar Surfaces - 406.5(H)(1) THRU (H)(4) (2分23秒)

• 课时163：RECEPTACLES USED FOR MAINTENANCE ACTIVITIES - 590.6 AND .6(A)​​​​​​​ (2分57秒)

• 课时164：AFCI-PROTECTED OUTLETS - 210.12(A) AND (D) (1分53秒)

• 课时165：AFCI-PROTECTED OUTLETS - 210.12(A) AND (D)​​​​​​​ (2分23秒)

• 课时166：Arc-Fault Circuit-Interrupter Protection - 210.12 (4分1秒)

• 课时167：Arc-Fault Circuit-Interrupter Protection210.12 (3分47秒)

• 课时168：Branch Circuit Extension or Modifications – Dwelling Units - 210.12(D) (2分57秒)

• 课时169：GROUNDING LUMINAIRES - 410.42 AND 410.44 (5分51秒)

• 课时170：UNGROUNDED LUMINAIRES - 410.44, Ex. 2 (2分46秒)

• 课时171：REPLACEMENT LUMINAIRES - 410.44, Ex. 1 (3分56秒)

• 课时172： (a) NUMBER ON A CIRCUIT - 210.11(A) (4分0秒)

• 课时173：(b) NUMBER ON A CIRCUIT - 210.11(A) (5分38秒)

• 课时174：LIGHTING OUTLETS IN DWELLING UNITS - 210.70(A)​​​​​​​ (3分53秒)

• 课时175：LIGHTING OUTLETS IN HABITABLE ROOMS - 210.70(A)(1) (2分33秒)

• 课时176：LIGHTING OUTLETS IN BATHROOMS - 210.70(A)(1) (1分58秒)

• 课时177：WALL-SWITCHED RECEPTACLE LIGHTING OUTLETS - 210.70(A)(1), Ex. 1​​​​​​​ (3分10秒)

• 课时178：LIGHTING OUTLETS IN HALLWAYS - 210.70(A)(2)(a)​​​​​​​ (2分19秒)

• 课时179：LIGHTING OUTLETS IN STAIRWAYS - 210.70(A)(2)(1) (2分46秒)

• 课时180：LIGHTING OUTLETS IN GARAGES - 210.70(A)(2)(1) AND (A)(2)(2) (1分13秒)

• 课时181： LIGHTING OUTLETS AT OUTSIDE DOORS - 210.70(A)(2)(2) (2分1秒)

• 课时182：LIGHTING OUTLETS IN UTILITY ROOMS - 210.70(C) (1分57秒)

• 课时183：LIGHTING OUTLETS IN BASEMENTS - 210.70(C) (1分54秒)

• 课时184：LIGHTING OUTLETS IN ATTICS - 210.70(C) (3分32秒)

• 课时185：LIGHTING OUTLETS IN UNDERFLOOR SPACES - 210.70(C) (3分27秒)

• 课时186：LIGHTING OUTLETS OVER BATHTUBS - 410.10(D)​​​​​​​ (2分51秒)

• 课时187：LOCATION - 410.16(C)(1) THRU (C)(5) (3分4秒)

• 课时188：GUEST ROOMS OR GUEST SUITES IN HOTELS AND MOTELS - 210.70(B)​​​​​​​ (2分27秒)

• 课时189：COMMERCIAL AND INDUSTRIAL ATTICS AND UNDERFLOOR SPACES (ALL OCCUPANCIES) - 210.70(C) (2分50秒)

• 课时190：ILLUMINATION FOR ELECTRICAL EQUIPMENT IN COMMERCIAL & INDUSTRIAL LOCATIONS - 110.26(D) (3分18秒)

• 课时191：RECESSED LUMINAIRES - 410.115(B) AND Ex.'s 1 AND 2 (2分39秒)

• 课时192：DISCHARGE LIGHTING - 410.140(B) (1分46秒)

• 课时193：LIGHTING OUTLETS AT SWIMMING POOLS - 680.22(B) (3分2秒)

• 课时194：LIGHTING OUTLETS AT SWIMMING POOLS - 680.22(B) (1分22秒)

• 课时195：WET-NICHE LUMINARIES - 680.23(B)(1) THRU (B)(8) (3分48秒)

• 课时196：WET-NICHE LUMINARIES - 680.23(B)(1) THRU (B)(8) (1分22秒)

• 课时197：WET-NICHE LUMINARIES - 680.23(B)(1) THRU (B)(8) (2分13秒)

• 课时198：DRY-NICHE LUMINARIES - 680.23(C) (2分25秒)

• 课时199：NO-NICHE LUMINAIRES - 680.23(D) (2分0秒)

• 课时200：LUMINAIRES OVER SPAS OR HOT TUBS - 680.43(B) (2分15秒)