NEC 2008 690 changes [RE-wrenches]
Mark Frye
markf at berkeleysolar.com
Wed Nov 14 13:21:22 PST 2007
>From a source previously mentioned, a compilation of:
Changes from 2005
690.4(D): Specified that equipment be identified and listed for the
application.
690.5: Revised to require all grounded dc PV arrays be provided with
ground-fault protection unless they meet either of the conditions in the
two exceptions.
690.5(B): Added requirement on permitted means to isolate faulted
circuits.
690.5(C): Provided specific wording for warning label required to be
factory- or field-installed on the inverter.
690.10(A): Clarified that the ac output of a stand-alone inverter may
be less than the calculated load, provided the output is adequate to
supply the largest single utilization equipment.
690.13: Specified that a switch, circuit breaker, or other device,
unless part of a ground-fault detection system, cannot be installed in
the grounded conductor if it results in the grounded conductors
becoming ungrounded and energized.
690.31(A): Revised to require readily accessible conductors operating
at over 30 volts to be installed raceways.
690.31(B): Revised to require use of either USE-2 or listed and
labeled photovoltaic (PV) wire.
690.31(F): Added section to provide termination requirements for
flexible, fine-stranded cables.
690.33(C): Added requirement for connectors that are readily
accessible and used with systems operating at over 30 volts to require a
tool for opening.
690.43: Clarified that an equipment grounding conductor is required
between the PV array and other equipment, and added requirements for
devices used to ground metal frames of PV modules.
690.45: Revised requirement on size of equipment grounding conductors
to at least 14 AWG.
690.46: Added requirement for physical protection of equipment
grounding conductors smaller than 6 AWG.
690.47(C): Specified the means of grounding and bonding PV systems
with ac and dc grounding and bonding requirements.
690.47(D): Added section to provide requirements for grounding
electrodes at ground and pole-mounted arrays.
690.57: Added requirement that load disconnects supplied by multiple
sources disconnect all sources when in the off position.
690.64: Specified that requirements apply to systems with
utility-interactive inverters.
690.64(B)(1) through (7): Revised to provide interconnecting
requirements for distribution equipment capable of supplying multiple
branch circuits or feeders while simultaneously connected to primary
power and one or more interactive inverters.
690.74: Added requirement for the use and termination of flexible
fine-stranded cables for battery interconnections.
Berkeley Solar Electric Systems
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