SE Digest 178

NQ Panelboards—240 Vac, 48 Vdc

NQ Factory Assembled Panelboards

NQ Main and Sub-feed Circuit Breakers

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Factory Assembled Main Circuit Breakers 400 A and 600 A panelboards, 1Ø or 3Ø Table 9.16: NQ Panelboard Factory Assembled Interiors - 240 Vac / 48 Vdc Max Single Phase or Three Phase Mains Rating (Amps) Min. Box Depth

Max. Number of One-Pole Circuit Breakers

Bus Material

Main Circuit Breaker [72]

Main Circuit Breaker / Switch

MainLugs Only

MainLugs Only

Main Switch [72]

9 PANELBOARDS

18, 30

Al,Cu

100Max 225Max 400Max

15–100 15–250 125–400

70–100

5.75 in. 5.75 in. 5.75 in.

5.75 in. 5.75 in.

110–250 30, 42, 54, 72, 84 Al, Cu

30, 42, 54, 72 [73] , 84 [74]

5.75 in. / 8.75 in. [75]

Al,Cu

300–400

450–600 30, 42, 54, 72 [73] , 84

8.75 in. [75]

Cu

5.75 in.

600Max

125–600

Table 9.17: Main Circuit Breaker (PowerPacT L-frame - see PowerPacT Interrupting Ratings, and Common Catalog Numbering System, in Section 7) Number of Poles Trip Unit Options Frame Sizes Ampacity 3 LI, LSI, Switch LG, LJ, LL 125–600A LA/LH PowerPacT H, J, and Q-frame circuit breakers are also available - see Tables PowerPact Interrupting Ratings, page and Common Catalog Numbering System, page and Supplemental Digest Section 3. Table 9.18: PowerPacT L Main Circuit Breaker Cabinet Height (inches) [76]

NEMA 1 Enclosure (20 in. W x 8.75 in. D) [77]

Vented NEMA 3R Enclosure (26 in. W x 8.75 in. D) [76]

Max. No. of Branch Spaces (Does not include sub-feed circuit breaker spaces)

400or 600A

400A

600A

30 42 54 72 84

62 68 74 80 86

62 68 74

68 74 80

– –

– –

Sub-feed Circuit Breakers Main lugs or main circuit breaker interior—1Ø or 3Ø. Maximum 1 circuit breaker per 225 A main lug or 250 A main circuit breaker panelboard, 2 circuit breakers per 400–600 A panelboard. Panelboards in MHxxWP NEMA Type 3R/5/12 enclosures are limited to one 150 A maximum sub-feed breaker. Table 9.19: Sub-feed Circuit Breaker (see PowerPacT Interrupting Ratings, and Common Catalog Numbering System, in Section 7) Panelboard Mains Rating Sub Feed Breaker Space Factor (in.) [78] No. of Poles Ampacity MCCBFrame

2 3 2 3 2 3 2 3 2 3 2 3 3

QB, QD, QG, QJ

70–225

18

HD, HG, HJ, HL, HR

110–150

18

225A

JD, JG, JJ, JL, JR

150–225

18

QB, QD, QG, QJ

70–225

24

400A, 600A

HD, HG, HJ, HL, HR

110–150

24

JD, JG, JJ, JL, JR

150–225

24

400A

LG, LJ, LL

126–600

18

600A PowerPacT H, J, & L frame circuit breakers are also available - see Tables PowerPacT Interrupting Ratings, and Common Catalog Numbering System, Section 7. Table 9.20: PowerPacT H, J, or Q-frame Sub-feed Circuit Breaker Cabinet Height (inches) Max. No. of Branch Spaces (Does not include sub-feed circuit breaker spaces) Standard Depth Enclosures(20 in. W x 5.75 in. D) 225A 250A 400A 600A

LA/ LHMain Circuit Breaker

Main Lugs [79]

Main Lugs

Main Lugs [79]

Main Circuit Breaker

30 42 54 72 84

50 56 62 68 74

62 68 74 80 86

74 74 80 86 92

86 86 92

74 80 80 86 92

– –

[72] Factory Assembled Interiors are rated for trip current of Main Breaker / Switch. [73] Three Phase only. [74] Copper only. [75] Deep Box required for PowerPacT L Main Circuit Breaker or Switch.

[76] Feed-thru lugs and compression lugs available factory assembled only. These add 6 - 12 inches to enclosure length. [77] D9 8.75" deep enclosures are required for PowerPacT L Main Circuit Breaker, Switch, or Sub-Feed Circuit Breaker. [78] Space Factor - add this length to enclosure when adding a Sub Feed Breaker. [79] Bottom feed only in NEMA 3R enclosures.

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