Just a pinch… Electrical Cable terminations
Sometime you just have to say… why? As a home inspector here in Wenatchee and Chelan I too many poor electrical installations. Some of this is fairly simple to get correct.
But again maybe not. These are conductors that are going to an air handler. Air handlers vibrate and over time that can cause wear on the conductor insulation.
So here are some codes when it comes to cable terminations.
From the 2014 NEC
314.17 Conductors Entering Boxes, Conduit Bodies, or Fittings
Conductors entering boxes, conduit bodies, or fittings shall be protected from abrasion and shall comply with 314.17(A) through (D).
(B) Metal Boxes and Conduit Bodies.
Where metal boxes or conduit bodies are installed with messenger-supported wiring, open wiring on insulators, or concealed knob-and-tube wiring, conductors shall enter through insulating bushings or, in dry locations, through flexible tubing extending from the last insulating support to not less than 6 mm (¼ in.) inside the box and beyond any cable clamps. Except as provided in 300.15(C), the wiring shall be firmly secured to the box or conduit body. Where raceway or cable is installed with metal boxes or conduit bodies, the raceway or cable shall be secured to such boxes and conduit bodies.
Most read this as per NEC 314.17 The outer jacket of type NM cable needs to be secured to the box and extend into the box at least ¼ inch.
312.5 Cabinets, Cutout Boxes, and Meter Socket Enclosures
Conductors entering enclosures within the scope of this article shall be protected from abrasion and shall comply with 312.5(A) through (C).
(C) Cables.
Where cable is used, each cable shall be secured to the cabinet, cutout box, or meter socket enclosure.
All cables must be secured to the enclosure with fittings designed and listed for the cable see 312.5(C). See 300.12 and 300.15.
Cable clamps or cable connectors must be used with only one cable, unless that clamp or fitting is identified for more than one cable.
There are some exception but they do not apply here.
When it comes to electrical installation they should be performed professionally and to the code adopted at the time of installation or modification if required.
If you find any errors or have additional information that would expand on any code, building standards or manufacturer requirements please let me know.
NCW Home Inspections, LLC is a Licensed Washington State Home Inspection service located in Wenatchee Washington serving Chelan County, Douglas County, Kittitas County, Okanogan County and Grant County Washington and the cities of Wenatchee, Leavenworth, Cashmere, Oroville, Cle Elum, East Wenatchee, Quincy and many more…
Your Wenatchee and Chelan Professional Real Estate, Home and Structural Pest Inspection Service
Coordinator & Instructor- Fundamentals of Home Inspection- Bellingham Technical College
Former WA Home Inspector Advisory Licensing Board
www.ncwhomeinspections.com 509-670-9572
You can follow me on Facebook, Twitter, Google+ and on my website Blog.
If you find any errors or have additional information that would expand on any code, building standards or manufacturer requirements please let me know.
NCW Home Inspections, LLC is a Licensed Washington State Home Inspection service located in Wenatchee Washington serving Chelan County, Douglas County, Kittitas County, Okanogan County and Grant County Washington and the cities of Wenatchee, Leavenworth, Cashmere, Oroville, Cle Elum, East Wenatchee, Quincy and many more…
Your Wenatchee and Chelan Professional Real Estate, Home and Structural Pest Inspection Service
Coordinator & Instructor- Fundamentals of Home Inspection- Bellingham Technical College
Former WA Home Inspector Advisory Licensing Board
www.ncwhomeinspections.com 509-670-9572
You can follow me on Facebook, Twitter, Google+ and on my website Blog.
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