300.16 Raceway or Cable to Open or Concealed Wiring
- Thread starter Son
- Start date
- Status
Hello everyone;
I don't know about the means of 300.16 NEC.
Would you mind if explaining or illustrating by pictures ???
Tks and BRs
300.16 Raceway or Cable to Open or Concealed Wiring.
Lets say your in a office building and lighting circuit is run in emt through all the offices .
Each office there is Jbox in your pipe run and you want to change to BX for your sw leg and lights thats what the code is talking about.
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
The "open and concealed" wiring of 300.16 is surface mounted cleats with individual insulated conductors clamped in the cleats (open wiring), and Knob & Tube (concealed wiring).
300.16 describes the special transition from raceway and cable wiring methods to the Article 394 and Article 398 wiring methods.
300.16(B) is particularly interesting. A fitting that some call a monkey fist, or a birds eye, is slipped onto the end of a raceway or cable, and each of the wires is then run through its own opening in the fitting, and the wires are then connected, in free air, to the K&T or the Open Wiring on Cleats.
This passage in the Code was created initially to describe how to connect newer wiring methods (like BX, the old non-bond-wire AC) to original K&T systems that were having branch circuits extended.
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
And "monkey face" is another name. Here are two older images I found. Above I was talking about BX armored cable, but these show a fitting that is made for use on NM cable. The difference is the BX monkey face will have a set screw to anchor on the BX armor, instead of the cable clamp shown below for the NM sheath.
The idea is that some type of fitting or body or enclosure must be used to end the cable sheath or armor, allowing the conductors within the cable to be exposed; and then, in the case of the monkey face, each conductor emerges through a separate bushed hole.
Also, Son, you might enjoy Googling "knob and tube" and clicking on the link to images of knob and tube. There's a lot there. You'll also find a lot of opinion about it. I'd be cautious about the opinions found along with the images until you have experience with the Code requirements and Code history, if you haven't gotten it yet.
Last edited:
- Status