NABCEP PV Installer - NEC sections Questions
and Verified Answers.
NEC: Max system voltage - ANS 690.7
NEC: Tk_Voc provided? - ANS Yes: 110.3
No: table 690.7
NEC: Series fusing - ANS 690.9
NEC: minimum series fuse size - ANS 690.8: I_sc x 1.25 x 1.25
NEC: rounding to standard OCPD size - ANS 240.4
NEC: standard fuse sizes - ANS 690.9
240.6
NEC: Listing of C-boxes - ANS 690.4
NEC: disconnects on grounded conductors - ANS 690.13: Not allowed. Exception:
690.13 GFP can open grounded conductor.
NEC: required disconnects - ANS 690.13, 690.14, 690.15
System disconnect - ANS Disconnect all building conductors from PV system. 690.17:
can sometimes be the breaker
NEC: "Readily accessible" - ANS Article 100: not locked, no ladder, no removal of
building material
NEC: Disconnect criteria - ANS 690.17: Readily accessible, externally operable, no live
part exposure, sufficiently rated
NEC: Acceptable disco locations - ANS 690.14: near interconnection point, outside or
near conductor entrance
NEC: C-box simultaneous disco - ANS 705.22: ungrounded conductors disconnected
simultaneously
NEC: Disco lockout - ANS 705.22: all must be capable of lockout
NEC: Max disconnects - ANS 690.14: <= 6 breakers/switches, entire system
230.71: PV doesn't count for building discos
and Verified Answers.
NEC: Max system voltage - ANS 690.7
NEC: Tk_Voc provided? - ANS Yes: 110.3
No: table 690.7
NEC: Series fusing - ANS 690.9
NEC: minimum series fuse size - ANS 690.8: I_sc x 1.25 x 1.25
NEC: rounding to standard OCPD size - ANS 240.4
NEC: standard fuse sizes - ANS 690.9
240.6
NEC: Listing of C-boxes - ANS 690.4
NEC: disconnects on grounded conductors - ANS 690.13: Not allowed. Exception:
690.13 GFP can open grounded conductor.
NEC: required disconnects - ANS 690.13, 690.14, 690.15
System disconnect - ANS Disconnect all building conductors from PV system. 690.17:
can sometimes be the breaker
NEC: "Readily accessible" - ANS Article 100: not locked, no ladder, no removal of
building material
NEC: Disconnect criteria - ANS 690.17: Readily accessible, externally operable, no live
part exposure, sufficiently rated
NEC: Acceptable disco locations - ANS 690.14: near interconnection point, outside or
near conductor entrance
NEC: C-box simultaneous disco - ANS 705.22: ungrounded conductors disconnected
simultaneously
NEC: Disco lockout - ANS 705.22: all must be capable of lockout
NEC: Max disconnects - ANS 690.14: <= 6 breakers/switches, entire system
230.71: PV doesn't count for building discos