Main Subjects
EMT(Electric Metallic Conduit) used for long run, less expensive, inside & outside application
FMT(Flexible Metallic conduit) Used for indoor application, for shot run ,more cost, less labor.
Non-Mettalic conduit - Rigid PVC, - Used for underground / Outside building.
Disconnect Switches
As per Utility requirements, PV Circuit and Inverter output should be lockable disconnect switch.
One Lockable Disconnect switch should be near the meter and should be visible and utility can access 24/7 .
will be operated by utility service person.
Selection of Fuse/ Circuit Breaker
For High Voltage DC Applications, the Fuse should be Selected accordingly.
Case Study:-
Ground Fault Protection
Is a standard in Grid Tied inverter.
Refer
solarprofessional.com
Labeling Requirements
DC Disconnect.
Utility Power Interconnection Point.
Building Exterior - Should have details of PV Source and all disconnection of the system.
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CASE STUDY -1
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Cable - B
Max. Output Current X 1.25 =
- Type of cables and Characteristics used in Solar PV Systems.
- Selection of Conduit
- Disconnect Switches
- Selection of Fuse/ Circuit Breaker
- Ground Fault Protection
- Labeling Requirements
- Underground Service Entrance Cable - for outdoor applications. not designed for fire ratings.
- External Wiring -
- Building Wiring (Internal Applications) - THHN, THWN - Heat Resistant Thermoplastic - doent run outside building. No sunlight resistant Characteristics.
- Battery wiring - Moister Resistant Thermoset (EHW) Heat Resistant themoplastic, Flexible wiring is another choice, make sure terminals and legs are designed for battery use.
- Grounding Wiring - Bare copper or Insulated copper conductor.
Selection of Conduit
- Selection - Depends up on the location (dry/wet)
- Temperature of Installation.
- Flexible and Rigid
- Metallic Conduit
- Non-Metallic Conduit
EMT(Electric Metallic Conduit) used for long run, less expensive, inside & outside application
FMT(Flexible Metallic conduit) Used for indoor application, for shot run ,more cost, less labor.
Non-Mettalic conduit - Rigid PVC, - Used for underground / Outside building.
Disconnect Switches
As per Utility requirements, PV Circuit and Inverter output should be lockable disconnect switch.
One Lockable Disconnect switch should be near the meter and should be visible and utility can access 24/7 .
will be operated by utility service person.
Selection of Fuse/ Circuit Breaker
For High Voltage DC Applications, the Fuse should be Selected accordingly.
Case Study:-
Ground Fault Protection
Is a standard in Grid Tied inverter.
Refer
solarprofessional.com
Labeling Requirements
DC Disconnect.
Utility Power Interconnection Point.
Building Exterior - Should have details of PV Source and all disconnection of the system.
========================================================================
CASE STUDY -1
========================================================================
Cable - A
Reference 690.8A, 690.8B --> Connect from PV Module.
(No of modules (strings) wired in parallel) X (Short circuit current-Isc) X 1.25 (safety factor for irradiance) X 1.25(Cable safety factor)
Cable shall not carry 80% of Max.
Where the maximum Current is expected to continue for 3 Hours or more, considered as continuous load (NEC Code article 100)
Total Safety factor - 1.25x1.25 = 1.56
Isc - 5.5A
Cable Selection for PV - 1.56 X 5.5A = 8.6Amp
Cable - B
Max. Output Current X 1.25 =
