B-inspector
Member
not really clear on the bonding jumper thing?:dunce:
not really clear on the bonding jumper thing?:dunce:
No kidding. A group of, well intentioned I'm sure, code making people managed to take an essential and simple concept and make it harder to learn or teach by giving us this alphabet soup of names for creating a fault current path.What kind of bonding jumper? The NEC has several, Main, Supply Side, System...
And all fault currents are required to work their way through the alphabet soup to decide which path(s) to follow. Fortunately that investigation occurs at roughly the speed of light.No kidding. A group of, well intentioned I'm sure, code making people managed to take an essential and simple concept and make it harder to learn or teach by giving us this alphabet soup of names for creating a fault current path.
How easy is that to get lost by missing your exit? I have done it so many times and my top speed is 83MPH, going downhill.And all fault currents are required to work their way through the alphabet soup to decide which path(s) to follow. Fortunately that investigation occurs at roughly the speed of light.
How easy is that to get lost by missing your exit? I have done it so many times and my top speed is 83MPH, going downhill.
For their sake I pray and hope none of these electrons are in the same car with their wives while sorting this out.That is exactly the issue! :thumbsup: The electrons only figure out which way to go by literally taking all of the wrong paths.
Some of the electrons will initially miss their turns (taking alternate paths based on the transmission line characteristic impedances rather than the actual circuit termination impedances). They will not know they have missed their exit until the current reaches the dead ends at the other end of the wrong turns. They then turn around and go back to add their current to the flow down the correct paths.
The propagation of the current and voltage down the wrong paths and back again will be happening at about 60% of the speed of light.
But the first time the stray electrons get back to the intersection, some of them will blithely take other wrong paths until it eventually all sorts itself out.
If the voltage and current rise times are so high that this time scale is actually important, you get weird effects like lightning taking improbable paths. When it gets to the dead ends, it sometimes just keeps going.
The NEC tells me types of bonding jumpers are...
1.Conductor (Implied by the NEC to be a Wire)
2.Bus
3.Screw
4.Similar Suitable Conductor (Anybody have an example of this?)
I understand that the definition of "conductor" relative to electrical work to generally be of the wire type.
Is this how others interpret the definition of a conductor?
I think #4 relates to the things that are made to connect a neutral bus bar to the panel it's mounted on. One end has a hole to put a screw through, the other is a rod about the size of a #8 wire, which goes into one of the terminals in the neutral bar. I don't know what they are called.
I think #4 relates to the things that are made to connect a neutral bus bar to the panel it's mounted on. One end has a hole to put a screw through, the other is a rod about the size of a #8 wire, which goes into one of the terminals in the neutral bar. I don't know what they are called.
#4
I use SQ D. They have two styles of lugs that you can use on a neutral bus. One is a straddle lug that fits over the neutral bus and straddles the bus. The other is a add-a-lug. A lug with two prongs that fit under your neutral bus screws, then your # 2 fits in the add-a-lug.
No, what K8MHZ is referring to is the bonding jumper, that among others, Eaton uses.
It is as he described, a short piece of metal that is rounded on the end about the size of #8 wire, then has an offset and then flattened on the end with a screw hole. It usually comes attached to the panel via the screw hole but is not connected to the neutral bus.
For a panel that is to be bonded you just swing it up to line up with a screw terminal in the neutral bar. You then place it in the terminal and tighten it down, also tighten the screw that attaches the jumper to the can. This makes the bond between the neutral and the metal of the cabinet and grounding bar.