P2 Panelboards
Flexibility is the hallmark of the P2 panel. This panel offers a
wide array of factory-assembled options to meet almost all
lighting panel applications. With this design, the ability to mix
breaker frames in unit space up to 250 amps will also meet
many distribution panel requirements in a much smaller package.
Busing options for the P2 vary from the typical temperature
rated to 750 A/Si aluminum to 1000A/Si copper. Standard
busing in the P2 panel is tin-plated. Silver-plated copper is also
offered as an option. Integrated time clocks, bus mounted
contactors, as mains or sub mains, split bus, and subfeed lugs
(up to 400 amp) are just a few of the options of this unique
panel.
Like a lighting panel, P2 is set up around 18, 30, 42, and 54
circuit configurations. It will also allow the user to configure
the panel to the smallest possible size. The P2 panel starts
with 9” of unit space (18 circuits of 1” pole breakers). Breakers
mounted in unit space can be mixed and matched to meet
customer requirements. All 1” pole breakers (BL, BQD6, ED
frames) are mounted in 3” or 6” pole increments. Breaker
frames, above 125 amps, are mounted in 6” single breaker
mountings. As an example of a minimum panel, (6) 20 amp
1-pole BL breakers (3” of unit space) and a 3-pole 225 amp
QJ breaker (6” of unit space) equaling 9” of unit space can be
configured in a P2 panel without any extra provisions or space
required. FD 250 amp and JD 400 amp breakers are mounted
as subfeed breakers outside of unit space.
Another unique feature of the P2 panel is that blank unit space
can be added to allow for future expansions or modifications.
Any expansions or modifications must be in 3” increments. BL,
BQD, and ED frame breakers have 3” or 6” pole kits, and can be
mixed in unit space by these increments. Breakers of the same
frame can cross from one mounting to another if contiguous.
QJ frame breakers are mounted in 6” increments for two and
three pole, single mounted units. Changes in the unit space
length for BL, BQD, or ED frame breakers require an addition
deadfront, center strip kit. Check with sales or the factory for
additional unit space kits.
Main Lug / Main Breaker
Enclosure
– Standard Type 1 enclosure is 20" wide x 5.75"
deep X. Box Height is determined by main device and unit
space. See charts for box height.
Voltage
– 600 Vac Max.
250 Vdc Max.
Amperage
– 600 amp Max.
Short circuit rating
– 200 KAIC Max. symmetrical or equal
to the lowest rated device installed unless a series rating is
indicated. Panels with subfeed or feed-thru lugs without a
main device, circuit breaker or fusible unit, are limited to a
three-cycle rating. The three-cycle rating for the P2 panel
is limited to 22 KAIC. Note that the main device may be
mounted remote from the panel.
Busing
– The P2 panel has more options to meet market
requirements. The standard busing is temperature rated
aluminum. The rating is per the requirements of CSA: 22.2
No. 29 – the standard for panelboards. All aluminum busing
is tin-plated. Optional busing for the P2 panel is: 750 A/Si
aluminum, temperature rated copper, and 1000 A/Si copper.
The copper bus option for this panel is tin-plated.
Weight
–
Approximate
Total panelboard weight when filled with a normal quantity
of breakers and accessories is about 3 lbs. (1 kg) per inch
(54g per mm) of box height.
Selection and Application
Step 1
Determine configuration required.
Example:
Amperage
250A
Voltage
208Y/120V
System
3Ø4W
Main
Main Lug
Bus Material
Temperature
rated
aluminum
Interrupt Rating
10 Ka
Branch Devices
(6) 20 amp, 1-pole
(1) 225 amp, 3-pole
Feed Location
Top
Mounting
Surface
Step 2
Create a catalogue number by following
the Catalogue Numbering System on
page 7-5
6. Note that the number of circuits num-
ber (4th and 5th position) will be 18 for
those panels with 6-18 circuits, 30 for
those panels with 19-30 circuits, 42 for
those panels 31 to 42 circuits and 54 for
those panels 43 to 54 circuits. The most
cost effective 20 amp 1-pole breaker for
this application would be BL. However,
a myriad of other breakers with options
may be used in the P2 panel. The most
cost effective 225 amp breaker for this
application is the QJ2.
Based on the above
P2C18ML250ATS
(6) BL 20 amp 1-Pole
(1) QJ2 225 amp 3-pole
Step 3
Determine the enclosure size. The matrix
on page 2-3 shows the enclosure sizes
based on the amperage, main device and
unit space required.
Dimensions in inches (mm) Gauge Steel
Width
Height
Box
Front
20”
26 - 74
#16
#14
(508) (660,
1880)
Table P2-1 – Gauge Steel of Boxes
Fronts, Surface and Flush
