TheNationalElectricalCode and UtilityGridTiedInteractivePhotovoltaicSystems
MECOSTANDARDSandLABELINGREQUIREMENTS
AsSetForthInRule14(H),Rule14AppendixIandRule18 RuleNo.14
H.InterconnectionofDistributedGeneratingFacilitiesOperatinginParallelwith
theCompany’sElectricSystem 1)InterconnectionStandards a.Distributedgeneratingfacilitiesoperatinginparallelwiththe
Company’sElectricSystemshallsatisfytheCompany’s
InterconnectionStandards. b.TheCompany’sInterconnectionStandardsareincludedas AppendixItoRule14. RuleNo.14,AppendixI 2.GeneralConnectionGuidelines a.CompliancewithLawsandCodes:Thegeneratingfacility,protection,
interconnectionequipment,design,anddesigndrawingsshallmeetall
applicablenational,state,andlocallaws,includingconstructionandsafety
codes.Thefollowingconstructionandsafetycodesshallbefollowedfor
thedesignandconstructionofalldistributedgeneratingfacility
installationstoensurethesafetyofthepublic,customer,andutility
personnel.Thesecodesinclude,butarenotlimitedto,thefollowing: x NationalElectricCode(NEC) x NationalElectricalSafetyCode(NESC) x NationalFireProtectionAssociation(NFPA)BuildingCode x
x
x
x
x
MauiCountyBuildingCode UniformBuildingCode(UBC) AmericanConcreteInstitute(ACI) AmericanInstituteofSteelConstruction(AISC) AmericanAssociationofStateHighways&Transportation
Officials(AASHTO) RULENo.18–NetEnergyMetering B.NetEnergyMeteringAgreementandInterconnectionRequirements 1.InPart,Compliance:TheCustomerGeneratorfacilityandinterconnection
Systemsmustbeincompliancewithallapplicablesafetyandperformance
standardsoftheNationalElectricCode(NEC),TheInstituteofElectricaland
ElectronicEngineers(IEEE),accreditedtestinglaboratoriessuchas UnderwritersLaboratories(UL),andwithRule14,sectionH,AppendixI. Alllabelsshallhavearedbackgroundlaminatedandengraved
with3/8inchwhiteminimumblockletteringforHeadings,Cautions,
Warnings,Identificationand¼inchletteringforbodyoftextwhen
necessary,forindoorandoutdooruse,UVstableandintendedfor
permanentapplications.Adhesivetypelabels(includinglabelmaker
tape)andfelttippensdonotsatisfythelabelrequirements.After
installation,thecustomershallmaintainthelabelscurrent,legibleand
accurate. MECO NEM LABELS
NEM LABEL 001
PREFERRED
NEC 690.14(C)(2)
PHOTOVOLTAIC SYSTEM
MAIN AC DISCONNECT
NEM LABEL 002
OK-PER MECO RULES
NEC 690.14(C)(2)
CUSTOMER GENERATOR
SYSTEM DISCONNECT
NEM LABEL 003
USE ON MAIN PV DISCONNECT
NEC 690.54
PHOTOVOLTAIC AC DISCONNECT
Rated AC Operating Current
Nominal Operating AC Voltage
NEM LABEL 004
WHEN SOURCE ON LINE & LOAD SIDE
WARNING
ELECTRIC SHOCK HAZARD
NOTTOUCH
TOUCH TERMINALS.
TERMINALS.
DODO
NOT
TERMINALS
ONTHE
THELINE
LINE AND
AND LOAD
TERMINALS
ON
LOAD
MAY
ENERGIZEDIN
INTHE
THE OPEN
OPEN
SIDESIDE
MAY
BE BE
ENERGIZED
POSITION.
NEC 690.17
NEC 690.17
NEM LABEL 005
INSTALL ON FRONT COVER
NEC 705.10
CAUTION
THIS ELECTRIC SERVICE IS SUPPLIED BY
TWO SOURCES OF POWER
1. ELECTRIC UTILITY GRID
2. SOLAR PHOTOVOLTAIC SYSTEM
NEM LABEL 006
USE ON MAIN SERVICE DISCONNECT
NEC 690.54
SOLAR PV SYSTEM CONNECTED
Rated AC Operating Current
Nominal Operating AC Voltage
NEM LABEL 007
USE ON MAIN SERVICE DISCONNECT
NEC Article 110.27(C).
WARNING
TURN OFF PHOTOVOLTAIC
AC DISCONNECT PRIOR TO
WORKING INSIDE PANEL.
NEM LABEL 008
WHEN MAIN BREAKER IS BACKFED
CAUTION
BREAKER IS BACKFED
NEC 705.12(D)(5)
NEM LABEL 009
NEC 690.56(B)
INTERACTIVE PHOTOVOLTAIC
SYSTEM CONNECTED
PHOTOVOLTAIC SYSTEM MAIN DISCONNECT
LOCATED [Description or Map of the Main PV
Disconnect relative to the customer main
service disconnecting means (and this plaque)
location]
NEM LABEL 010
NEC 690.56(B)
PV SYSTEM IS INTERACTIVE
UTILITY GRID-TIED
THE CUSTOMER MAIN SERVICE DISCONNECT
LOCATED [Description or Map of the Customer Main
Service Disconnect location relative to the PV
System Main Disconnect (and this plaque) location]
NEM LABEL 011
NEC 690.56(B)
INTERACTIVE PHOTOVOLTAIC
SYSTEM CONNECTED
CUSTOMER MAIN SERVICE DISCONNECT AND
THE PHOTOVOLTAIC SYSTEM MAIN
DISCONNECT LOCATED [Description or Map of
the SERVICE DISCONNECT and Main PV
Disconnect relative to the Electric Utility Meter
(and this plaque) location]
Customer Main Service Disconnect
Photovoltaic System Labeling
The customer Main Service Disconnect (Load Center) can be part of the meter facility or a separate piece of
equipment. When the Main Service Disconnect and the Main PV System Disconnect are not at the same location,
there must be a readily visible permanent plaque [NEC 690.56(B)] on the front panel cover that describes or maps
the location of the Main PV System Disconnect in detail. Depending on whether the PV tap (Point of Connection) is
made on the line side or load side of the Main Service Disconnect will determine which PV Labels are needed.
LABELS FOR LINE SIDE TAP
FRONT PANEL: MECO NEM LABEL-005 and (MECO NEM LABEL009 if PV Disconnect at different location).
INSIDE PANEL: MECO NEM LABEL-006 and MECO NEM LABEL007
LABELS FOR LOAD SIDE TAP
FRONT PANEL: MECO NEM LABEL-005 and (MECO NEM LABEL009 if PV Disconnect at different location).
INSIDE PANEL: MECO NEM LABEL-006, NEM LABEL-007, NEM
LABEL-004 and NEM LABEL-008
Main PV System AC Disconnect
Photovoltaic System Labeling
The Main PV System AC Disconnect if not located at the same location as the Customer Main Service
Disconnect shall have a readily visible permanent plaque [690.56(B)] describing or mapping the location of the
Customer Main Service Disconnect in detail. Also other labeling is required and should be consistent for all Main
PV System AC Disconnects whether or not it is at the same location as the Customer Main Service Disconnect.
MAIN PV SYSTEM AC DISCONNECT LABELING
MECO NEM LABEL-001 (Preferred) or NEM LABEL-002
MECO NEM LABEL-003
MECO NEM LABEL-004
MECO NEM LABEL-010, Plaque is required if not at the same
location as the Customer Main Disconnect.
Meter Stands Alone
Photovoltaic System Labeling
When the electric meter panel stands alone, where the Customer Service Disconnect and the Main PV System
Disconnect are not at the same location as the meter, then there needs to be labeling to inform persons that the
electric service is served by dual sources (see MECO NEM Label 005). There also needs to be a permanent plaque
that describes or maps the location of both the Customer Service Disconnect and the Main PV System Disconnect
(see MECO NEM Label 011). When there is insufficient room to install labeling on the equipment, labeling should
be installed adjacent to the equipment.
NEM LABEL 005
CAUTION
THIS ELECTRIC SERVICE IS SUPPLIED BY
TWO SOURCES OF POWER
1. ELECTRIC UTILITY GRID
2. SOLAR PHOTOVOLTAIC SYSTEM
NEM LABEL 011
INTERACTIVE PHOTOVOLTAIC
SYSTEM CONNECTED
CUSTOMER MAIN SERVICE DISCONNECT AND
THE PHOTOVOLTAIC SYSTEM MAIN
DISCONNECT LOCATED [Description or Map of
the SERVICE DISCONNECT and Main PV
Disconnect relative to the Electric Utility Meter
(and this plaque) location]