Most inspectors will not have a problem with you upgrading conductors or
conduit for performance. Upgrading any PV system components must be
addressed in the as-built drawings. However, they will not be pleased to see corner
cutting or misrepresentation of your plans or work.
PV installers can use many checklists throughout system installation. One of
those is the PV system field worksheet. The PV system field worksheet is a check-
list that inspectors use as well. This worksheet helps ensure that the equipment,
conduit, and wiring are installed according to NEC guidelines.
The PV system field worksheet also makes certain that the PV system adheres
to the approved PV design plans. Have the one-line diagram, three-line drawings,
and site plan on hand for the inspector at the field inspection. The whole design
package will be required at the site along with posting the permit. Be ready to
explain any deviations between the diagrams and actual placement of equipment,
conduit, or wiring.
Any significant changes need to be clarified in the as-built changes to the
approved plan. Remember that the inspector has the right and authority to
require you to make changes. It is always best that these be avoided by working
with the inspector so there are no surprises for either of you.
Make sure to review the as-built changes with the inspector to
guarantee compliance with building and electrical codes.
Make certain that each drawing corresponds to the
approved plan, and that all equipment, conduit, and wiring
are accurate. This includes matching the PV module model
number to the approved design plans and cut sheets and
grounding the PV modules.
Ensure that the wiring is uniform with the number of PV modules.
Inspect to make sure that the cables and conduits are properly braced.
Test the plug connectors to ensure that the connectors are fully employed.
Structure Attachments According to Plans and Directions
Make sure to include all structural attachments in the approved PV design plans
and permit. The inspector is responsible for verifying that the attachments match
design plans. He or she is also responsible for confirming that the modules are
attached to the structure properly.
Appropriate Signs Installed
Use preprinted, permanent metal labels from the manufacturer. Labeling helps
identify PV system components with permanent markings. These labels are
designed so that the information does not wash off or erode and keeps it protected
from environmental elements.
NOTE
Ground all modules with stainless steel
grounding screws or lugs. The metal
bonds the module frame to the rails on
the roof. Fasten the grounding wires to
the lugs.
CHAPTER 9 The Evolving PV System: From Concept to Certification 223
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