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SOLAR PV STANDARD ELECTRICAL PLAN (City of Colton)

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SOLAR PV STANDARD ELECTRICAL PLAN
MICROINVERTER SYSTEMS
For Single-Family Dwellings
Note to Applicant:
Complete these forms before coming to the City for permit process
Provide two complete permit packages of these forms to the Public Counter Staff
Provide this document to the building inspector along with ALL system installation instructions at
the job site.
Project Address:________________________________________________________
Permit Number:___________________________________________________________
Scope: Standard plan for the installation of microinverter solar PV systems, not exceeding a total AC
output of 10kW, in single family dwellings having a 3 wire electrical service not larger than 225 amps at a
voltage of 120/240. This plan covers crystalline and multicrystalline type modules where all the modules
and microinverters are mounted on the roof of the single family dwelling. For installations exceeding
this scope, Electrical Plan review is required.
Note: This plan is not intended for systems containing batteries. This document addresses only the
requirements of the 2013 California Electrical Code (CEC), refer to other toolkit documents for
California Residential Code (CRC) requirements.
INSTALLER INFORMATION:
Name:
Phone Number: ( ) -
Address:
Homeowner:
City:
Contractor:
State: Zip:
Contractor License # License Type
A)
Module information:
1) Manufacturer:________________________________
2) Model Number:_______________________________
3) Total number of modules being installed:______________
4) Maximum DC output voltage (Voc):_____
Volts
5) Maximum DC current output (Isc):____
Amps
Important:
Not all modules are suitable for use with microinverter systems. Review the microinverter
installation manual prior to beginning any installation to avoid costly errors.
NOTE: Calculate the total AC output of the system.
# of microinverters x Inverter AC Output Current___amp x 240 volts= _____watts divided by 1000=___kW
CITY OF COLTON
DEVELOPMENT SERVICES DEPARTMENT
BUILDING AND SAFETY DIVISION
659 NORTH LA CADENA DRIVE
COLTON, CALIFORNIA 92324
(909) 370-5079
7:30 a.m. to 4:30p.m. Monday – Thursday
B) Microinverter information:
Each microinverter shall be listed by a recognized listing agency, have factory installed Ground Fault protection and
be identified as “Utility-Iinteractive”.
Provide the following information from the microinverter installation manual. If any information is not provided by the
manufacturer write “not given” in the appropriate box
6) Manufacturer:_______________________
7) Model number:______________________
8) Minimum mounting height above the roof surface______
inches
9) Maximum DC input voltage _______
Volts
10) Maximum DC input current______
Amps
11) Maximum AC output current______
Amps
12) Maximum size branch circuit breaker permitted_________
Amps
13) Maximum number of inverters permitted per branch circuit_____________
Note: The number of microinverters installed per branch circuit may be less than the maximum number permitted by the
manufacturer, but it shall not be more.
C) Manufacturer “Trunk” cable (if supplied):
Some microinverter manufacturers include as part of their installation kit a “Trunk” cable that each microinverter
of the branch circuit plugs into. These cables must be listed by a recognized listing agency, have a wet insulation
temperature rating of at least 90 degrees celsius, be provided with an equipment grounding conductor inside of
the overall cable sheath and contain no more than three current carrying conductors. Cables that will be exposed
to sunlight must be listed as such. This cable will typically be run underneath the array where it will not be subject to
physical damage. This cable, if provided, must be used. Non-manufacturer supplied cables or installer fabricated
assemblies are not approved. Where the cable is exposed to physical damage, the cable shall be protected.
14)
Provide the conductor size of the manufacturer supplied “Trunk” cable____
AWG (From cable jacket)
15)
Provide the
MINIMUM INSTALLATION
spacing above the roof surface to the bottom of the ”Trunk” cable
per the installation instructions_____
inches
(If no dimension specified, write “None given”).
16)
Provide the
MINIMUM INSTALLATION
spacing below the array modules to the top of the “Trunk” cable
per the installation instructions_____
inches
(If no dimension specified write “None given”).
D) Temperature compensation for roof mounted cables under the array:
17) Temperatures under the array may be higher than the surrounding ambient air. Where cables are
installed close to the roof surface or to the modules, local jurisdictions may require the ambient air
temperature to be higher based on local conditions. Some local enforcing agencies use ASHRAE to
determine the local ambient temperature. Below are the temperatures for the local jurisdiction.
(i) The Ambient Air Temperature for this jurisdiction is: 45
°
C
Note: Some local jurisdictions may require this temperature to be increased when sizing conductors
beneath the module or array
E) Sizing the conductors for the microinverter branch circuit:
The amount of current that will be carried by the conductors shall be calculated as follows:
33
18)
Maximum # of inverters installed per branch circuit
________ x
Maximum inverter AC output (Step
#11)____________
A x 1.25
(for long continuous load)
=__________ Amps.
Where the manufacturer supplied cable transitions to regular building wire installed inside of a raceway, a reduction
in the amount of current these conductors can carry may be required based on the exposed ambient air
temperature and number of conductors in the raceway.
Note how many conductors will be in the raceway and how high above the roof surface the raceway will be
mounted. Using
Table A
on page 4, select the appropriate “Ambient Temperature” section for your project
location from (Step #17
(i)
) and choose a conductor size that will meet or exceed the result from Step #18. Your
selected conductor size is permitted to have a higher ampacity than the number in step #18,
but it shall not be
less.
Selected conductor size for branch circuit wiring in raceway ____________ AWG.
Table A
Table A is based on the following:
A. Table 310.15(B)16 - Allowable Ampacity of Insulated Conductors, 90 C rated conductors.
B. Table 310.(B)(2)(a) - Correction Factors based on temperature ranges.
C. Table 310.15(B)(2)(b) - Ambient Temperature Adjustments for Conduits Exposed to Sunlight On
or Above Rooftops.
D. Table 310.15(B)(3)(a) Adjustment Factors for More Than Three Current-Carrying Conductors in a
Raceway or Cable.
E. Sections 240.4(D)(5) and 240.4(D)(7) for 10 AWG and 12 AWG conductors
Table A: Maximum Allowable Ampacity of Conductors Installed in a Circular Raceway, Exposed to
Sunlight, On or Above Rooftops
Number of
Current Carrying
Conductors in a
Raceway
Height Above
Rooftop
Less than 30
˚
C
30
˚
C to 35
˚
C
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
0 to 0.5"
17
23
32
44
55
17
23
32
44
55
above 0.5" to 3.5"
20
30
42
57
72
20
28
39
53
67
Up to 3 Conductors
above 3.5" to 12"
20
30
45
62
78
20
30
42
57
72
above 12"
20
30
48
65
83
20
30
45
62
78
0 to 0.5"
14
19
26
35
44
14
19
26
35
44
above 0.5" to 3.5"
18
24
33
46
58
17
23
31
43
54
4 to 6 Conductors
above 3.5" to 12"
20
26
36
49
62
18
24
33
46
58
above 12"
20
28
38
52
66
20
26
36
49
62
0 to 0.5"
12
16
22
30
39
12
16
22
30
39
above 0.5" to 3.5"
16
21
29
40
51
15
20
27
37
47
7 to 9 Conductors
above 3.5" to 12"
17
23
32
43
55
16
21
29
40
51
above 12"
18
24
33
46
58
17
23
32
43
55
0 to 0.5"
9
12
16
22
28
9
12
16
22
28
10 to 20
above 0.5" to 3.5"
11
15
21
29
36
11
14
20
27
34
Conductors
above 3.5" to 12"
12
16
23
31
39
11
15
21
29
36
above 12"
13
17
24
33
41
12
16
23
31
39
35
˚
C to 40
˚
C
40
˚
C to 45
˚
C
0 to 0.5"
12
16
23
31
39
12
16
23
31
39
above 0.5" to 3.5"
17
23
32
44
55
17
23
32
44
55
Up to 3 Conductors
above 3.5" to 12"
20
28
39
53
67
17
23
32
44
55
above 12"
20
30
42
57
72
20
28
39
53
67
0 to 0.5"
10
13
18
25
31
10
13
18
25
31
above 0.5" to 3.5"
14
19
26
35
44
14
19
26
35
44
4 to 6 Conductors
above 3.5" to 12"
17
23
31
43
54
14
19
26
35
44
above 12"
18
24
33
46
58
17
23
31
43
54
0 to 0.5"
9
11
16
22
27
9
11
16
22
27
above 0.5" to 3.5"
12
16
22
30
39
12
16
22
30
39
7 to 9 Conductors
above 3.5" to 12"
15
20
27
37
47
12
16
22
30
39
above 12"
16
21
29
40
51
15
20
27
37
47
0 to 0.5"
6
8
11
15
19
6
8
11
15
19
10 to 20
above 0.5" to 3.5"
9
12
16
22
28
9
12
16
22
28
Conductors
above 3.5" to 12"
11
14
20
27
34
9
12
16
22
28
above 12"
11
15
21
29
36
11
14
20
27
34
45
˚
C to 50
˚
C
50
˚
C to 55
˚
C
0 to 0.5"
0
0
0
0
0
0
0
0
0
0
above 0.5" to 3.5"
12
16
23
31
39
12
16
23
31
39
Up to 3 Conductors
above 3.5" to 12"
17
23
32
44
55
12
16
23
31
39
above 12"
17
23
32
44
55
17
23
32
44
55
0 to 0.5"
0
0
0
0
0
0
0
0
0
0
above 0.5" to 3.5"
10
13
18
25
31
10
13
18
25
31
4 to 6 Conductors
above 3.5" to 12"
14
19
26
35
44
10
13
18
25
31
above 12"
14
19
26
35
44
14
19
26
35
44
0 to 0.5"
0
0
0
0
0
0
0
0
0
0
above 0.5" to 3.5"
9
11
16
22
27
9
11
16
22
27
7 to 9 Conductors
above 3.5" to 12"
12
16
22
30
39
9
11
16
22
27
above 12"
12
16
22
30
39
12
16
22
30
39
0 to 0.5"
0
0
0
0
0
0
0
0
0
0
10 to 20
above 0.5" to 3.5"
6
8
11
15
19
6
8
11
15
19
Conductors
above 3.5" to 12"
9
12
16
22
28
6
8
11
15
19
above 12"
9
12
16
22
28
9
12
16
22
28
F) Solar Load Center and circuit breakers, sizing information:
Many utility providers require a performance meter and a safety disconnect switch to be installed between the
PV power source and their equipment. This means that the microinverter branch circuits may not connect directly
into the electrical panel of the house. They may go first to a solar load center. This is just a standard circuit breaker
panel that collects together the individual branch circuits from the microinverters. Each branch circuit
shall
have its own dedicated circuit breaker. From this panel one feeder will go to the performance meter (if required),
then to the safety disconnect switch (if required), and finally to the point of interconnection at the house electrical
panel. Only PV system monitoring equipment/devices are permitted to be connected between the output of the
inverter and the house electrical panel. Contact your local utilities for performance meter and AC utility
disconnect switch requirements.
19) Total number of microinverter branch circuits installed in the solar load center.
20) List the current in Amps (from step 18) for each individual branch circuit in the solar load center.
i.
Circuit #1 output ___
Amps,
Circuit #2 output______
Amps,
Circuit #3____
Amps,
Circuit #4____
Amps.
21)
Total PV current in Amps connected to the panel (sum of the individual branch circuits from step
20)= _______A
mps
22) Panel bus bar rating ( from panel label) ______Amps. This figure must be larger than the number at step #21 or the
panel will be undersized.
23)
Size of Main breaker if installed (If no main write NONE)
______ Amps
24) To size the feeder conductors leaving the solar load center use the result from step #21 and go to table
310.16, using the 75°C column, to select the correct size conductor for your installation.
G) Utility “Performance” meter (if required):
Where an additional meter is required by the local Utility to record the power produced by the PV system
the output wiring from the microinverters shall always connect to the
“LINE”
side terminals at the top
of the meter. The wiring from the meter to the electrical panel will connect to the
“LOAD”
side
terminals at the bottom. Not all utility providers have the same requirements for connecting solar power
systems to their electrical systems. Contact the local utility for specific requirements in the local
jurisdiction.
H) Utility “Safety Disconnect Switch” (if required):
Where disconnect switches (with or without fuses) are installed in the circuit(s) from the microinverters
to the house electrical panel, the wiring originating at the microinverters shall always connect to the
“LOAD”
side
(bottom)
terminals of
ANY
disconnect switch that has been installed. The wiring
originating at the electric service panel shall always connect to the
“LINE”
side
(top)
terminals. Check
with the local utility for specific requirements.
I) Connection to the house electrical panel:
The connection to the service panel
shall
be through a dedicated circuit breaker that connects to the panel
bus bars in an approved manner. “Load Side Taps” where the inverter AC wiring does not terminate
using a dedicated breaker or set of fuses are prohibited under
ANY
condition by
Section 705.12
.
Where the main breaker of the electrical panel that the PV system will interconnect to is located at either the
top or bottom of the panel distribution bus bars and the PV interconnect breaker is located at the opposite
end, the code permits the sum of the ratings of the main breaker and the PV breaker to exceed the rating of the
panel bus bars. Per
Section 705.12 (D)(2)
, the sum of the electrical panel main breaker and the
microinverter PV interconnect breaker shall not add up to more than 120% of the rating of the panel bus
bars. For a 100 amp rated bus this means that both breakers together shall not add up to more than
120
amps.
For a 200 amp rated bus, not more than
240 amps
and for 225 amps, not more than
270 amps.
In
order to qualify for this additional allowance, the PV breaker
must
be located at the opposite end of the
breaker panel from the main breaker and shall have the warning label installed next to it per
Section 705.12
(D)(7)
.
“WARNING INVERTER OUTPUT CONNECTION. DO NOT RELOCATE THIS OVERCURRENT
DEVICE”.
Note:
Certain “All-in-One” service panels have the factory installed main breaker in the center of the di stribution
section. Because of the possibility of overloading the bus bars, this type of service is not able to take
advantage of the 120% overage permitted for top or bottom fed bussing. For this type of installation the sum
of the main circuit breaker and the PV breaker may not exceed 100% of the rating of the factory bussing.
For example, if the service panel label states that the bus bars are rated for 200 amps you cannot exceed
that figure. In some cases it may be possible to reduce the size of the main circuit breaker to accommodate
the addition of a PV breaker and still not exceed the bus bar rating. This requires that a “load calculation” of
the house electrical power consumption be made in order to see if this is an acceptable solution. Where it
is necessary to install the PV interconnection as a “Line Side Tap” and where the electrical service panel at
the dwelling is an “All-in-One” type, the service shall be provided with factory installed terminals designed
specifically to accommodate this type of connection. Where these terminals are not provided there shall be
NO
PV connection between the load side of the meter and the line side of the main circuit breaker.
J) Grounding the photovoltaic system:
A
Grounding Electrode Conductor
sized per the manufacturer’s installation instructions, (minimum #8
AWG solid copper), shall be run
UNSPLICED
from the factory identified grounding terminal of each
microinverter to the grounding electrode system of the house, (i.e. ground rod, Ufer ground, or metallic
water pipe with a minimum of 10 feet in the ground).
Note:
The Grounding Electrode Conductor is permitted to be spliced per
Section 250.64 (C)
using an
irreversible means or by the installation of a “Ground Plate”. (A Ground Plate is defined as a copper bus bar
1/4” thick by 2” wide by whatever length is needed to terminate the conductors). This conductor may also be
used as the required equipment grounding conductor for the modules and the frame rails of the array.
(Equipment grounding conductors may be connected to the Grounding Electrode Conductor by non-
irreversible means such as listed split bolts).
K) Disconnection of photovoltaic equipment:
Section 690.15 requires that means are provided to disconnect equipment from all ungrounded conductors of all
sources. Such disconnecting means shall comply with Sections 690.16 and 690.17.
Note: Section 690.17 contains an exception which states "A connector shall be permitted to be used as an ac
or a dc disconnecting means, provided that it complies with the requirements of 690.33 and is listed and
identified for the use."
L) Signage:
Per Section 690.54
, a permanent label for the microinverter AC power source shall be installed at the
point of interconnection at an accessible location. This label shall show that it is a PV source and additionally,
the rated AC output current and the nominal operating AC voltage.
37
SOLAR PV STANDARD PLAN
CENTRAL INVERTER SYSTEM
for Single Family
Dwellings
M
Note:
Italicized text shown inside the boxes is not
required to be part of the sign, it is only for reference
PHOTOVOLTAIC SYSTEM UTILITY SAFETY
DISCONNECT SWITCH (IF REQUIRED)
UTILITY PERFORMANCE METER (IF
REQUIRED)
INSTALL PERMANENT PLAQUE OR
DIRECTORY PROVIDING THE
LOCATION OF THE SERVICE
DISCONNECTING MEANS =, AND
PHOTOVOLTAIC SYSTEM
DISCONNECTING MEANS IF NOT
INSTALLED AT THE SAME LOCATION.
PLAQUE SHALL BE MOUNTED ON THE
EXTERIOR OR THE BUILDING.
690.56-(b), 705.10
WARNING
DUAL POWER
SOURCES
SECOND SOURCE IS
PHOTO-VOLTAIC
SYSTEM
RATED AC OUTPUT
CURRENT- ## AMPS
AC NORMAL
OPERATING
VOLTAGE-### VOLTS
690.54
WARNING
PV OUTPUT
CONNECTION
DO NOT RELOCATE THIS
OVERCURRENT DEVICE
(UNLESS BUSBAR IS FULLY RATED)
690.64(B)(7), 705.12(D)(7)
A
C
M
COLLECT
OR
PANEL/
SOLAR
LOAD
CENTER
PV SYSTEM AC DISCONNECT
RATED AC OUTPUT CURRENT-AMPS
AC NORMAL OPERATING
VOLTAGE- ### VOLTS
690.54
Array (Modules and Microinverters)
J/B
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Completed 18 December 2020

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