Square D Digest 179

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 9.14: 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 [82]

Main Circuit Breaker / Switch

MainLugs Only

MainLugs Only

Main Switch [82]

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 [83] , 84 [84]

5.75 in. / 8.75 in. [85]

Al,Cu

300–400

450–600 30, 42, 54, 72 [83] , 84

8.75 in. [85]

Cu

5.75 in.

600Max

125–600

Table 9.15: 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 Table 7.44 and Table 7.45 and Supplemental Digest Section 3. Table 9.16: PowerPacT L Main Circuit Breaker Cabinet Height (inches)

NEMA 1 Enclosure (20 in. W x 8.75 in. D) [85]

Vented NEMA 3R Enclosure (26 in. W x 8.75 in. D) [86]

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 PowerPacT H-, J-, or Q-frame sub-feed circuit breakers may be installed on a 400– 600 A panelboard. Panelboards in MHxxWP NEMA Type 3R/5/12 enclosures are limited to one 150 A maximum sub-feed breaker. • Panelboards in vented MHxxD9VWP NEMA 3R enclosures may have two 225 A maximum sub-feed circuit breakers. A single 600 A maximum sub-feed circuit breaker may be factory installed in these new enclosures. Table 9.17: Sub-feed Circuit Breakers for NQ Panelboards [87] Interior Rating Sub Feed Circuit Breakers [87] Space Factor Ampacity Poles MCCBFrame

QB, QD, QG, QJ

70–225 110–150 150–225 70–225 110–150 150–225 125–400 125–600

2or 3 2or 3 2or 3 2or 3 2or 3 2or 3 2or 3

HD, HG, HJ, HL, HR [88] JD, JG, JJ, JL, JR [89] QB, QD, QG, QJ [90] HD, HG, HJ, HL, HR [88] , [90] JD, JG, JJ, JL, JR [89] , [90]

225A

18 in.

24 in.

400A / 600A

LA / LH

18 in. [91]

3 18 in. [92] PowerPacT H, J, & L frame circuit breakers are also available - see Tables PowerPacT Interrupting Ratings, and Common Catalog Numbering System, Section 7. LG, LJ, LL

[82] Factory Assembled Interiors are rated for trip current of Main Breaker / Switch. [83] Three Phase only. [84] Copper only. [85] D9 8.75 in. deep enclosures are required for PowerPacT L Main Circuit Breaker, Switch, or Sub-Feed Circuit Breaker. Reference PBA713x drawing for more dimensional information, where x may be A, HR, HRT, or T depending upon the choice of options and enclosure. [86] Feed-thru lugs and compression lugs available factory assembled only. These add 6 - 12 inches to enclosure length. Please reference PBA755 or PBA755T for more complete dimensional information, where x may be A, HR, HRT, or T depending upon the choice of options and enclosure. [87] See Digest Section 7 for Interrupting Ratings and Catalog Numbers of PowerPacT H-, J-, L-, Q- and LA/LH frame MCCBs. [88] Three pole HD, HG, HR MCCBs are installed for single phase sub-feed circuit breaker applications. [89] Three pole JR MCCBs are installed for single phase sub-feed circuit breaker applications. [90] One or two sub-feed circuit breakers may be selected. [91] NQ Panelboards with LA or LH sub-feed circuit breaker and LG, LJ, or LL main circuit breaker are supplied with 26 in. wide, 8.75 in. deep enclosures and have Condo Riser neutral assemblies. [92] Space Factor for LG, LJ, or LL is 24 in. when it is installed onto a main circuit breaker panelboard or a main lugs panelboard with a Condo Riser neutral assembly. These panelboards are supplied with 26 in. wide, 8.75 in. deep enclosures and have Condo Riser neutral assemblies.

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