2dana
New member
- Location
- Houston, Texas
I'm kind of caught between the manufacturer and the installers. As an IAEI guy, I tried to explain that bonding and grounding serve separate but complimentary purposes.
The code phrase "internal" is essentially being ignored - "it's bonded at the origination" so it doesn't need to be "grounded" again inside the box.
IEEE 515 design and FM approval are the reasoning for not requiring the internal bonding.
Written to the manufacturer........
Hi *******, I just wanted to touch base with you regarding a question I have about installations of some small junction boxes.
My personal understanding of National Electrical Code Article 314 is that ?internal bonding means? are required within the non-metallic boxes when we use a metal raceway. The xxxxx model does have an internal metal plate for raceway entries that accomplishes the bonding to ground.
Here?s the code section I?m referring to:
NEC 314.3 Nonmetallic Boxes
Nonmetallic boxes shall be permitted only with open wiring on insulators, concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords and nonmetallic raceways.
Exception No. 1: Where internal bonding means are provided between all entries, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.
Your interpretation or opinion of my observations are appreciated, thanks.
Dana M. Littlefield
Project Quality Manager
The code phrase "internal" is essentially being ignored - "it's bonded at the origination" so it doesn't need to be "grounded" again inside the box.
IEEE 515 design and FM approval are the reasoning for not requiring the internal bonding.
Written to the manufacturer........
Hi *******, I just wanted to touch base with you regarding a question I have about installations of some small junction boxes.
My personal understanding of National Electrical Code Article 314 is that ?internal bonding means? are required within the non-metallic boxes when we use a metal raceway. The xxxxx model does have an internal metal plate for raceway entries that accomplishes the bonding to ground.
Here?s the code section I?m referring to:
NEC 314.3 Nonmetallic Boxes
Nonmetallic boxes shall be permitted only with open wiring on insulators, concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords and nonmetallic raceways.
Exception No. 1: Where internal bonding means are provided between all entries, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.
Your interpretation or opinion of my observations are appreciated, thanks.
Dana M. Littlefield
Project Quality Manager
