A.Joe Tedesco, licensed
electrician, certified electrical inspector, and moderator of
the jlconline.com electrical forum, responds: According to
the latest version of the National Electrical Code, the
insulating sheathing is supposed to extend into an electrical
junction box at least 1/4 inch beyond the cable clamp (2005
NEC, 314.17[C]). Extending the sheathing, as you suggest, may
be effective, but it would certainly need the approval of your
local code official. Because heat-shrink tubing isn't
specifically designed or approved for this use, per NEC
110.3(B), I personally would not allow this solution.
interconnectors can be used to permanently splice or tap 12-
and 14-AWG Type NM-B sheathed cable without a junction box.
Typically used to interconnect prefabricated, prewired modular
structures, some of these devices are also approved for the
repair or modification of existing house wiring.
If there is cabinetry under the counter, it might be possible
to access the wire in the wall behind the cabinet and add a
junction box that is accessible from inside the cabinet. Your
electrician could then reroute the existing cable to this box
and run a new length of cable to the new outlet location above
Another option that might be approved by your inspector would
be to splice on a short length of additional cable using a
nonmetallic-sheathed cable interconnector (see photos, left).
Molex (800/786-6539, www.molex.com) and Amp Netconnect
(800/553-0938, www.ampnetconnect.com) offer a number of
taps and splices designed and approved for commercial use and
for modular and manufactured housing. Some of these are listed
as meeting the requirements of 2005 NEC 334.40(B), which deals
with taps and three-wire interconnectors in residential
After making the splice, the connection would need to be open
for inspection, but once approved it could be concealed behind
the drywall. Of course, you should first contact your code
official to make sure this would be acceptable.