The NFPA Standards Council issued a Tentative Interim
Amendment (TIA) in reference to Section 680.42(B) of the 2011 NEC. TIA
Log No. 1005 revises the text of 680.42(B) to read as follows:
"Bonding by metal-to-metal mounting on a common frame or base
shall be permitted.
The metal bands or hoops used to secure wooden
staves shall not be required to be bonded as required in
Exception No. 1: The metal bands or hoops used to secure wooden
staves shall not be required to be bonded as required in 680.26.
Exception No. 2: A listed self-contained spa or hot tub that meets all
of the following conditions shall not be required to have equipotential
bonding of perimeter surfaces installed as required in 680.26(B)(2):
(1) Is installed in accordance with manufacturer’s instructions on or
(2) The vertical measurement from all permanent perimeter surfaces
within 30 horizontal inches (76 cm) of the spa to the top rim of the spa
is greater than 28 inches (71 cm).
Informational Note: For further information regarding the grounding and
bonding requirements for self-contained spas and hot tubs, see ANSI/UL
1563 – 2009, Standard for Electric Spas, Equipment Assemblies, and
here to access the document as posted on the NFPA website and review
the submitter's substantiation text and supporting
This TIA has a comment closing date of January 14, 2011. To submit a
comment (on company letterhead), please identify the number of the TIA
and forward to the Secretary, Standards Council, 1 Batterymarch Park, Quincy, MA
Think you know how this installation violates the
NEC? Visit EC&M's
website to see the answer.
Hint: Swiss cheese-style load center
Q. When I add a GFCI-protected receptacle in an
existing circuit that does not have an equipment grounding conductor,
can I add additional grounding-type receptacles on the load side of
website to see the answer.
Fill in the blanks with the correct answers.
New requirements for marking of cable trays apply when the cable trays
installed within substations contain conductors _________. The warning
notice shall be installed in a conspicuous position along the cable tray
at intervals not to exceed ____ ft.
A. with 600V insulation; 20
B. cable tray rated; 50
C. rated higher than 600V; 10
D. rated higher than 35kV; 20
website for the answer and explanation.
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