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SOLAR PV STANDARD ELECTRICAL PLAN (City of Colton)

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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
SOLAR PV STANDARD ELECTRICAL PLAN
CENTRAL INVERTER SYSTEM
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 suite
Project Address:___________________________________________________________
Permit Number:___________________________________________________________
Scope
:
Standard plan for installation of solar PV systems utilizing 2 wire multiple string central inverters,
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 Multi-Crystalline type modules
where all the modules are mounted on the roof of the single family dwelling. For installations exceeding this
scope, Electrical Plan review is required.
NOTE: This plan is intended for use with standard DC to AC inverters containing an
isolation transformer. This plan is NOT intended to be used with micro inverters or
transformer-less inverters and is limited to installations where the DC system voltage does not
exceed 600 volts. This plan is not intended for systems containing batteries or power optimizer.
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:________________________________
City:____________________________________
State:__________________ Zip:______________
Homeowner
Contractor
Contractor License #
License type _____
Required information for DC wiring:
1. Total number of solar modules being installed:
2. Number of modules per string:
3. How many strings total?
4. Are any strings wired in parallel?Yes No
If “Yes”, how many are paralleled together?
Two Other (specify)
5. Are you installing a combiner box with fuses?
Yes No
( I f Y e s , i n c l u d e c a l c u l a t i o n i n S t e p # 1 3 )
5. Module Voc (from module nameplate):
6. Module Isc (from module nameplate):
8. Module maximum fuse or circuit breaker size
(from module nameplate):
9. Temperature correction factor from
Table
690.7
of the 2013 CEC. Varies by
location. (Check with the local building
department for this figure)
10. Calculate the maximum DC system voltage (Shall not exceed the inverter maximum DC input
voltage and shall not exceed 600 volts):
Maximum number of modules per string_____ x____ Vocx temperature correction
factor____=____volts
Note:
This formula is intended to provide a close approximation of the maximum DC system
voltage possible at the job location under the lowest ambient temperature condition. This result will
always be slightly higher than when using the module manufacturer supplied temperature
coefficient. The intent is to alert the installer that the 600 volt limit is close to being exceeded and is
not intended to provide as accurate a result as the calculation employing the manufacturer
supplied coefficient. Where the installer chooses to use the manufacturer’s supplied coefficient,
approval by the local enforcing agency is required.
11. Calculate the maximum DC current per string to allow for peak sunlight conditions and continuous
operation in excess of three hours:
Module Isc______x 1.56 =_________
Max amps carried by the conductor.
12.
Choosing a conductor size for the DC source circuits & output circuit:
Where Type USE-2 or other listed PV conductors are run in free air from the module locations to a
junction box or combiner box, the minimum size permitted shall be #12 AWG per the module
manufacturers’ installation instructions and the conductor material shall be copper.
If any part of the wiring from the modules to the combiner box or inverter is to be installed in a
raceway, reductions in the amount of current the conductors can carry may have to be made.
Conductors to be installed in a raceway shall be Type THWN-2 or equivalent and the conductor
material shall be copper.
To select the correct conductor size for the PV source circuits from the modules to the combiner box or
to the inverter, go to Table A on page 4. Select how many conductors you will have in the raceway
and how high above the roof surface the raceway will be mounted. Using the appropriate “Ambient
Temperature” section for the job location, select the number from the column in Table A that
matches the result you entered in item #11. (The number in Table A may be the same or larger
than the number in item #11,
but it shall not be less
). Move to the top of the column to see the
minimum size conductor needed for this part of the installation. Enter the number here for the
Source Circuit conductor size
: #
AWG.
Note: Per Section 338.12(B)(1), USE-2 shall not be used for interior wiring.
13. If a combiner box is to be installed to connect the string circuits together, then the size of the “Output
circuit” conductors from the combiner to the inverter must be determined.
To do this, multiply the number of strings that are to be combined (from item #3) with the “Max amps”
(from item #11)______x______= Amps. Using Table A, repeat the process used to select the
conductor size for the source circuits and enter the number here for
Output Circuit conductor
size:
#____
AWG.
(If no combiner box, enter N/A)
14. Where a combiner box is installed, or where more than two strings of modules are electrically
connected together in “parallel”, each individual string shall be protected by its own over current
protection or feeders to be sized for sum of all short circuit current of all strings. The fuse or
breaker shall be listed as being suitable for use in a DC circuit and shall meet or exceed the
maximum voltage of the circuit. The rating of the fuse or circuit breaker shall not be larger than the
maximum size specified on the lowest rated module in the string. All combiner boxes shall be listed
by a recognized listing agency and labeled as such.
Max fuse / breaker size permitted (from step #8) ________ A.
Fuse / breaker size installed _______________________ A.
Note:
Where the module specifies “Max fuse size” a circuit breaker shall not be substituted.
Where the module specifies “Max overcurrent protective device” (Max OCPD), then either a fuse
or DC rated circuit breaker may be used.
NOTE:
Per
Section 690.31 (E),
DC wiring can only be run inside of the house if it is installed in a listed
metallic raceway or enclosure
..
15. 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
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
Height Above
Rooftop
Highest Ambient Temp
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
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
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
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
above 0.5" to 3.5"
11
15
21
29
36
11
14
20
27
34
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
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
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
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
above 0.5" to 3.5"
9
12
16
22
28
9
12
16
22
28
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
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
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
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
above 0.5" to 3.5"
6
8
11
15
19
6
8
11
15
19
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
Grounding the DC side of the inverter:
A minimum #8 copper Grounding Electrode conductor must be run un-spliced from the factory identified
system grounding terminal of the inverter to the grounding electrode system of the house. The grounding
electrode system may consist of one or more of the following: Ground rod(s), Ufer ground, or metallic water
pipe with a minimum of 10 feet in the ground. (
Section 690.47)
AC wiring information:
15. The inverter shall be listed and labeled by a recognized testing agency and be identified as “Uti lity
interactive”. Ground fault protection (GFP) shall comply with
Section 690.5
2010 CEC.
Specify inverter: Make ________________ Model # __________ Elec rating _______ kW
16. Per
Section 690.9
2013 CEC, each inverter shall be protected by an overcurrent device on the AC output side
of the inverter. This can be a fuse or a circuit breaker. To correctly size the overcurrent device, locate the
maximum AC output of the inverter (in amps) on the inverter nameplate, and multiply by 1.25 (This is
required because the unit will be in continuous use for more than three hours).
Maximum AC output current____
x
1.25 =____Amps.
(This number will also be used to size the
inverter output circuit conductors.)
Where the “Maximum AC output” is shown only in Watts, divide that number by 240 and then multipl y by
1.25 to get the correct size breaker or fuse.
If the maximum AC output is between standard breaker or fuse sizes, the next higher size can be used so long
as the inverter output conductors are sized sufficiently large enough for the amount of current produced by
the inverter.
Important note:
Where a fused disconnect switch is installed, the output conductors from the
inverter will connect to the
“LOAD”
side (
bottom
) terminals of the switch and the wiring from the utility will
connect to the
“LINE”
side (
top
) terminals. This meets the requirement of
Section 404.6(C)
and will reduce
the risk of electrical shock hazards when changing a fuse with the system still energized by the utility
electrical supply.
17. 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 AC power output from the inverter(s) may not
connect directly into the electrical panel of the house. For a single inverter, the output from the inverter
disconnect switch will connect to the performance meter (if required). Where multiple central inverters are
installed, they will usually go first to a solar load center. This is just a standard circuit breaker panel that
collects together the output circuits from the individual inverters. Each inverter will have its own circuit breaker.
The size of each circuit breaker will be determined from step #16. From this panel one feeder will go to the
performance meter, then to the safety disconnect switch and lastly to the point of interconnection at the
house electrical panel. No electrical loads shall be connected between the output of the inverter and the
connection to the house electrical panel. Contact your local utilities for performance meter and AC utility
disconnect switch requirements.
18. Where a performance meter is required by the local utility to record the power produced by the PV system, the
output wiring from the inverter shall always connect to the
“LINE”
side terminals of the meter.
19. Where disconnect switches (with or without fuses) are installed in the circuit from the inverter output terminals
to the house electrical panel, the wiring originating at the inverter(s) shall always connect to the
“LOAD”
side terminals of
ANY
disconnect that has been installed
20. The connection to the breaker 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
.
21. Per Section 690.64(B)(2), the sum of all overcurrent protective devices supplying power to the busbar or
conductor shall not exceed 120% of their rating. In most PV installations, the breakers feeding the busbar
are the main breaker and the backfed PV breaker. Per Section 690.64(B)(7), to utilize the 120% rule, the
PV backfed breaker must be at the opposite end of the main breaker location. For a 100 amp rated bus,
this means that the main breaker and the PV backfed breaker shall not add up to more than 120 amps. For
a 200 amp rated bus, the combined ampacity of the two breakers (the main breaker and the PV breaker)
shall not exceed 240 amps and so on. The location of the PV backfed breaker must be identified per
690.64(B)(7) with the following verbiage:
“WARNING INVERTER OUTPUT CONNECTION. DO NOT
RELOCATE THE OVERCURRENT DEVICE.”
27
Where it is not possible to locate the breakers at opposite ends of the panel bus, the sum of the
two breakers is not permitted to exceed 100% of the bus rating.
Note:
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.
22.
Per
Section 690.53
, a permanent label for the DC power source shall be installed at the PV DC
disconnecting means. This label shall show the following: (a) Rated maximum power-point current, (b) Rated
maximum power-point voltage, (c) Maximum system voltage, (d) Short circuit current of the PV system.
a.
Rated maximum power-point current (mppA)
(this is the actual current in amps produced by the PV
system). Multiply the Imax value from the module nameplate by the number of strings in the system.
Imax _____x # of strings ___________ = _______ Amps.
b.
Rated maximum power-point voltage (mppV)
(this is the highest operating voltage of the PV
system). Multiply the Vmax value from the module nameplate by the number of modules in the
largest string.
Vmax____ x # of modules____=_____Volts.
c.
Maximum system voltage
(see step #10
)_____Volts
d.
Short circuit current
of the PV system (module Isc from step #7 x 1.25).
Isc _____x 1.25 =____Amps.
Note:
A phenolic plaque with contrasting colors between the text and background would meet the intent of
the code for permanency. No type size is specified, but 20 point (3/8”) should be considered the
minimum.
SOLAR PV STANDARD ELECTRICAL PLAN
CENTRAL INVERTER SYSTEM
For Single Family Dwellings
23. The following signage is required to be installed:
(a) Per
Section 690.17
2013 CEC, where both the line and load side terminals of any disconnect may be
live in the “OFF “position, the following warnings shall be placed on the front of the disconnected
“WARNING LINE AND LOAD TERMINALS MAY BE ENERGIZED IN THE OPEN POSITION.”
ARRAY
Note:
Italicized text shown inside the boxes is not required to be part of the sign, it is only for reference.
WARNING
DUAL POWER SOURSES
SECOND SOURSE IS PHOT-VOLTAIC SYSTEM
RATED AC OUTPUT CURRENT-###AMPS
AC NORMAL OPERATINGVOLTAGE-###VOLTS
(690.54)
WARNING
INVERTER OUTPUT
CONNECTION
DO NOT RELOCATE THIS
OVERCURRENT DEVICE
(UNLESS BUSBAR IS FULLY
RATED)
690.64(B) (7)-705.12(D)(7)
WARNING
ELECTRIC SHOCK HAZARD
IF A GROUND-FAULT IS INDICATED,
NORMALLY GROUNDED CONDUCTORS
MAY BE UNGROUNDED AND
ENERGIZED.
690.5(c)
PV SYSTEM AC DISCONNECT
RATED AC OUTPUT CURRENT-AMPS
AC NORMAL OPERATING VOLTAGE-###VOLTS
(690.14, 690.15, 690.54)
OFCA-DC CONDUIT (EVERY 10’)
INTERIOR/EXTERIOR
SFM REQUIREMENT-CHECK WITH
LOCAL ENFORCING
AGENCY
WARNING-Electrical Shock Hazard
DO NOT TOUCH TERMINALS
TERMINALS ON BOTH LINE AND LOAD
SIDES MAY BE ENERGIZED IN THE
OPEN POSITION
690.64(B)(7)-705.12(D)(7)
PV SYSTEM DC DISCONNECT
RATED MAX POWER-POINT CURRENT-###ADC
RATED MAX POWER-POINT VOLTAGE-###VDC
MAXIMUM SYSTEM CURRENT-###ADC
SHORT CIRCUIT CURREN-### ADC
690.14(C)(2), 690.15. 690.53
M
A
C
INVERTER
DC
J/B
CAUTION SOLAR CIRCUIT
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