NEC 2008 690 changes [RE-wrenches]

[Mark Frye]

>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 conductor’s 
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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