rabidsquirrel
Well-known member
If you look at the strands they have a right hand twist. Twisting them so they have a left hand twist reduces the splaying when wrapped around the screw.
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Tamper Resistant Duplex stranded wire...?
- Thread starter madosta
- Start date
If you look at the strands they have a right hand twist. Twisting them so they have a left hand twist reduces the splaying when wrapped around the screw.
Speedy Petey
Well-known member
Really? Please tell me where is this found?That is a clear code violation, .
wyliesdiesels
Well-known member
Yeah, how is that a code violation? I'm all ears!
Hopefully he was thinking stranded wire in a back stab. I can understand that being a bad idea.
Stranded and solid around a screw if UL listed.
I much prefer stranded and the pressure plate.
I am still not sure if UL list spade/fork terminals are a good idea.
It's weird that something seemingly so popular has so many possibilities. lol.
Stranded and solid around a screw if UL listed.
I much prefer stranded and the pressure plate.
I am still not sure if UL list spade/fork terminals are a good idea.
It's weird that something seemingly so popular has so many possibilities. lol.
Like I said its clear as mud, there is the good ol UL508a standard that states:
29.3.3 A connection to a wire-binding screw shall be made as follows such that no loose strands protrude from the connection:
a) Solid wire formed into a loop at least three quarters (270 degrees) around the terminal; or
b) Stranded wire that is:
1) Soldered;
2) Connected to a terminal provided with upturned ends;
3) Connected to a terminal provided with a cup washer; or
4) Connected to a crimped pressure terminal connector or eyelet;
I dont think this would exist if there wasnt an issue with it being a good electrical connection.
Back stabbing type recepts are the worst in my opinion but wrapping stranded around a screw is not a good connection, it goes back to workmanlike manner.
Inpectors will fail that installation, Ive seen it over and over, I dont belive that its local code but ultimately its up to the authority having jurisdiction.
In my house on my jobs I order my recepts with pressure plates if Im running stranded, if its romex then it doesnt matter cause its solid.
29.3.3 A connection to a wire-binding screw shall be made as follows such that no loose strands protrude from the connection:
a) Solid wire formed into a loop at least three quarters (270 degrees) around the terminal; or
b) Stranded wire that is:
1) Soldered;
2) Connected to a terminal provided with upturned ends;
3) Connected to a terminal provided with a cup washer; or
4) Connected to a crimped pressure terminal connector or eyelet;
I dont think this would exist if there wasnt an issue with it being a good electrical connection.
Back stabbing type recepts are the worst in my opinion but wrapping stranded around a screw is not a good connection, it goes back to workmanlike manner.
Inpectors will fail that installation, Ive seen it over and over, I dont belive that its local code but ultimately its up to the authority having jurisdiction.
In my house on my jobs I order my recepts with pressure plates if Im running stranded, if its romex then it doesnt matter cause its solid.
Speedy Petey
Well-known member
Care to clue us in as to what "29.3.3" is? I don't feel like looking it up.
Speedy Petey
Well-known member
Never mind. I got it.
UL508A
Hmmm.....here is the scope of UL508:
UL508A
Hmmm.....here is the scope of UL508:
1 Scope
1.1 These requirements cover industrial control devices, and devices accessory thereto, for starting, stopping, regulating, controlling, or protecting electric motors. These requirements also cover industrial control devices or systems that store or process information and are provided with an output motor control function(s). This equipment is for use in ordinary locations in accordance with the National Electrical Code, NFPA 70.
1.2 These requirements cover devices rated 1500 volts or less. Industrial control equipment covered by these requirements is intended for use in an ambient temperature of 0 - 40°C (32 - 104°F) unless specifically indicated for use in other conditions.