Installation Guide

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MISSION SOLAR ENERGY LLC

ELECTRONIC versions are uncontrolled except when accessed directly from document control directory. Printed copies are uncontrolled unless verified against online document.

REVISION:[ R10] 6/12/2019

RELEASE DATE: 11/16/2016

12.0 ELECTRICAL INSTALLATION

12.1 LOCAL / NATIONAL CODE AND

LOCAL REGULATION

To carry out installation, local regulations that may

apply should be taken into account such as NEC (USA)

or Canadian Electrical Code (Canada). Wiring should

be performed by a qualified and licensed

professional. Wiring should be protected to help

ensure personal safety and to prevent damage. All

modules connected in series should be of same model

number and/or same type. Do not connect modules

in parallel without using a combiner box or

equivalent.

Under normal conditions, a photovoltaic module is

likely to experience conditions that produce current

and/or voltage other than reported at standard test

conditions. The requirements of the National Electric

Code (NEC) in Article 690 shall be followed to address

these increased outputs. In installations not under

the requirements of the NEC, the values of ISC and

VOC marked on this module should be multiplied by

a factor of 1.25 when determining component

voltage ratings, conductor capacities, over current

device ratings and the size of controls connected to

the PV output.

12.2 WIRING

Mission Solar PV modules come with a factory

assembled Junction Box. Do not open the junction

box in any case. Wiring must be done in accordance

with local/national code and regulations; wear

protective gloves and shoes to avoid electric shock.

Address the following recommendations:

• The modules combined in parallel will produce a

specific current output. Each series string or

module is required to be fused. Table 1 describes

the maximum fuse size allowed.

• Do not connect the modules if the connectors are

wet.

• Be sure to put the cables away from sharp edges.

• If you need additional cables, you must use

exclusively solar cable of 12AWG/4mm2

minimum cross-sections, with ability to work in a

temperature range of at least -40

C and 90

• Install the modules so that water from rain or

condensation cannot penetrate inside the cable

conduits.

• Fix cables to the structure so that the connectors

are protected from water ingress. Cables should

be held by UV resistant clamps or ties.

• To minimize possible effects of lightning induced

voltages, the surface of all conductive loops must

be as small as possible.

• Check that the wiring is correct before starting

the installation by verifying that the open voltage

is within expected values.

• Protect cables that could suffer mechanical

damage.

• Avoid direct sunlight on cables.

• Maximum series fuse rating 20A.

• Details for wiring in accordance with the NEC, and

that the grounding method of the frame of arrays

shall comply with the NEC, article 250.

• Installation shall be in accordance with CSA C22.1,

Safety Standard for Electrical Installations,

Canadian Electrical Code and Part 1.

• Modules may be connected in series (voltage

additive) and/or in parallel (current additive) to

produce the appropriate electrical output. When

connecting modules in parallel, each module (or

series string of modules so connected) shall be

connected according to the maximum series fuse

as specified.

• Recommended series connection of module open

circuit voltage should not exceed 80% limits range

of the system voltage and the fuse should be

connected at the end of each array.

• The installation instructions specify that

grounding is achieved through securement to the

array frame. The array frame must be grounded

in accordance with NEC Article 250.