Section 9: Panelboards PDF

Section 9: Panelboards PDF

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NF Factory Assembled Main Circuit Breakers

Refer to NF Panelboards

Factory Assembled Main Circuit Breakers—600Y/347 Vac maximum

NF Panelboard Factory Assembled Interiors—600Y/347 Vac Max

Single Phase 3-Wire (1P/3W), or Three Phase 4-Wire (3P/4W)[1]

Mains Rating (Amps)

Max. Number of One-Pole Circuit Breakers

Bus Material

Min. Box Depth (inches) 

Main Lugs Only

Circuit Breaker Frame

Main Breaker[2]

Main Switch[2]

Main Lugs Only

Main Breaker / Switch

125 Max

ED, EG, EJ[3]

15–125

 –

18, 30

Al, Cu

5.75 in.

5.75 in.

125 Max

 HD/HG/HJ/HL/HR

15–125

110–125

18, 30, 42, 54[4]

Al, Cu

5.75 in.

5.75 in.

250 Max

 JD/JG/JJ/JL/JR

150–250

150–250

30, 42, 54, 66

Al, Cu

5.75 in.

5.75 in.

400 Max

 LA/LH

125–400

300–400

30, 42, 54, 66, 84

Al, Cu

5.75 in.

5.75 in.

600 Max

 LG/LJ/LL/LR[5]

125–600

450–600

30, 42, 54, 66[6], 84

Cu

5.75 in.

8.75 in.[7]

800 Max

 MG 600–800 —

30, 42, 54

Cu

8.75 in.[8]

8.75 in.[9]
PG, PJ, PL 600–800 600–800

note

Factory Assembled Main Circuit Breakers (600Y/347 Vac maximum). 600Y/347 Vac applications require use of ExBx6xxx branch circuit breakers, i.e. EDB16015 for a 1P, 15A circuit. [10]

400 A and 600 A panelboards, 1Ø or 3Ø

PowerPacT L-frame - see Tables in Section 7.

Main Circuit Breaker

No. of Poles Trip Unit Options Frame Sizes Ampacity

3

LI, LSI, Switch

LG, LJ, LL, LR

125–600 A

LA/LH, PowerPacT H and J-frame circuit breakers are also available—see Tables in Section 7 and Supplemental Digest Section 3.

PowerPacT L Main Circuit Breaker Cabinet Height (inches)

Max. No. of Branch Spaces
(Does not include sub-feed circuit breaker spaces) 		NEMA 1 Enclosure
(20 in. W x 8.75 in. D)[11] 		Vented NEMA 3R Enclosure
(26 in. W x 8.75 in. D)[12]
400 / 600 A Interior 400 A 600 A
30 68 68 74
42 74 74 80
54 80 80 86

Sub-feed Circuit Breakers for NF Panelboards [13]

Interior Mains Rating Mains Type Sub-Feed Circuit Breaker(s) Space Factor[14]
Ampacity Poles MCCB Frame
250 - 800 A Main Lugs 110 - 150 2, 3 HD, HG, HJ, HL, HR[15] , [16] 18 inches
150 - 250 2, 3 JD, JG, JJ, JL, JR[16] , [17]
250 - 400 A PowerPacT J or LA/ LH Main Circuit Breaker 110 - 150 2, 3 HD, HG, HJ, HL, HR[15] , [16]
150 - 250 2, 3 JD, JG, JJ, JL, JR[16] , [17]
125 - 600 2, 3 LA or LH[18]
3 LG, LJ, LL, LR[19]
400 - 600 A[20] , [21] PowerPacT L Main Circuit Breaker[22] 110 - 150 2, 3 HD, HG, HJ, HL, HR[15] , [16] 18 inches
150 - 250 2, 3 JD, JG, JJ, JL, JR[16] , [17]
125 - 400 2, 3 LA / LH[18] 12 inches
125 - 600 3 LG, LJ, LL, LR[20] 18 inches
800 A[23] Main Circuit Breaker 110 - 150 2, 3 HD, HG, HJ, HL, HR[15] , [16] 12 inches
150 - 250 2, 3 JD, JG, JJ, JL, JR[16] , [17] 18 inches
125 - 400 2, 3 LA / LH 12 inches
125 - 600 3 LG, LJ, LL, LR 18 inches
400 - 800 A[18] Main Circuit Breaker[22] 110 - 400 2, 3 One LA / LH with one H-, or J- frame 36 inches
 

Footnotes

  1. NF panelboards without neutral connections may be applied in 3-phase, 4-wire grounded Wye systems, except at the Service Entrance.
  2. Factory Assembled Interiors are rated for trip current of Main Breaker / Switch.
  3. Back-Fed Main Breaker applications only.
  4. Three Phase Copper only.
  5. PowerPacT L crcuit breakers may only be installed on 600 A NF panelboard interiors. 400 A max. PowerPacT L circuit breakers should be selected for applications requiring trip ampacities between 125–400 A.
  6. NF Panelboards with PowerPacT L Main Circuit Breaker or Switch are limited to a maximum of 54 branch circuits.
  7. NF Panelboards with PowerPacT L Main Circuit Breaker or Switch require 8.75 in. deep enclosures and three point latch trim fronts.
  8. Enclosures limited to NEMA Type 1 only.
  9. 8.75 in. Enclosures limited to 26 in. Wide NEMA Type 1.
  10. Requires use of ExBx6xxx branch circuit breakers, i.e. EDB16015 for a 1P, 15A circuit.
  11. D9 8.75 in. deep enclosure and three point latch door is required for PowerPacT L Main Circuit Breaker, Switch, or Sub-Feed Circuit Breaker. See NF Main Circuit Breaker Interiors - Use I-Line Panelboard for 3Ø3W Delta applications above 240 Vac.
  12. PowerPacT L not available in non-vented (NEMA Type 3R/5/12, or 4/4X) enclosures.
  13. See Digest Section 7 for Interrupting Ratings and Catalog Numbers of PowerPacT H-, J-, L-, and LA/LH frame MCCBs. NEMA 3R applications with sub-feed breakers greater than 150 A require 8.75 in. deep, 26 in. wide enclosure - reference PBA603WP for dimensions.
  14. Space Factor is the length required for sub-feed circuit breaker. Please reference Product Selector output for panelboard enclosure dimensions.
  15. Three pole HD, HG, HR MCCBs are installed for single phase sub-feed circuit breaker applications.
  16. One or two sub-feed circuit breakers may be selected.
  17. Three pole JR MCCBs are installed for single phase sub-feed circuit breaker applications.
  18. NF Panelboards with LA / LH sub-feed circuit breakers are shipped fully assembled.
  19. NF Panelboards with PowerPacT L main and sub-feed circuit breakers require 26 in. wide, 8.75 in. deep enclosure with 3-point latch trim front. Reference PBA758 or PBA754 drawings for dimensions in NEMA Type 1 or 3R enclosures, respectively.
  20. NF Panelboards with PowerPacT L circuit breakers require 8.75 in. a deep enclosure with 3-point latch trim front. Reference PBA559x drawings for dimensions, where x may be blank, HR, HRT, or T.
  21. Add 6 in. to space factor for NF Panelboards with 600 A PowerPacT L circuit breakers in NEMA 3R enclosures. Reference PBA754 drawing for dimensions. Maximum sub-feed breaker is 400 A when installed with a 600 A rated main circuit breaker in a NEMA 3R enclosure.
  22. NF Panelboards with PowerPacT L main circuit breaker and any sub-feed circuit breaker(s) are shipped completely assembled in 26 in. wide, 8.75 in. deep enclosures, with gutter mounted neutral assemblies.
  23. NF Panelboards with 800 A rated main circuit breaker are shipped completely assembled in 26 in. wide, 8.75 in. NEMA 1 enclosures. Reference PBA756 or PBA756HR drawing for dimensions.
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