250.102(c)

Status
Not open for further replies.
J

jca0108

Member
It says "where the service entrance conductors are paralleled in two or more raceways or cables, the equipment bonding jumper, where routed with the raceways or cables, shall be run in parallel. " Routed with the raceway?
Since when do we put an equipment bonding jumper to service drop or service lateral?
 
jca0108 said:
It says "where the service entrance conductors are paralleled in two or more raceways or cables, the equipment bonding jumper, where routed with the raceways or cables, shall be run in parallel. " Routed with the raceway?
Since when do we put an equipment bonding jumper to service drop or service lateral?
Click to expand...


I'm assuming that the bold portion of your post is the part that's causing the confusion. I'm also unclear as to what that bold portion means.

The notable part of the last two sentences in that section are that if you are installing a bonding jumper on the supply side of a service say for a metallic raceway, the bonding jumper can be sized according to the size of the conductors within the conduits. The same thing would apply to the secondary conductors of a transformer.
 
infinity has a point about the secondary of a transformer,but the only thing is that in 250.102(C) deals with SERVICES. May be there is an application out there for routing the equipment bonding conductor with the raceways, but i just cant think of one. I thought this section dealt with the bonding jumper from the enclosure to the raceway until i read it. im lost.
 
jca0108 said:
so if i run 2 hots, 1 neutral, and a ground up a riser to connect to the utility, (120v /240v dwelling unit)what do you connect the ground to?
Click to expand...
You would not do that . The ground you speak of is not a bonding jumper but your neutral is already a bonded grounded conductor.

I think you want to know when do we use an EGC for service conductors? No???
 
Dennis Alwon said:
You would not do that . The ground you speak of is not a bonding jumper but your neutral is already a bonded grounded conductor.

I think you want to know when do we use an EGC for service conductors? No???
Click to expand...

your rite but what does it say then, because thats what 250.102(C) says. ive pictured using pvc and metal raceways on the line and load of a meter (whether to utility or to main disconnect). but no matter which way i draw it up, it doesnt let me apply that sentence in 250.102(C). by the way , do service entrance conductors also apply to the load side of a meter?
 
The Poco calls the 3rd wire a ground, (old POCO guys might call it the neutral) three wires should go up the stack.

The house neutral, meets the poco ground in the meter or the disconnect if both are together (IE side by side-and there is a CODE for that Variable)((IE if side by side))...

One will bring the the ground rod wire, the Poco ground, and the neutral from the panel all together; be it the at disconnect or the meter (see above). It all depending on how the POCO wants it, PER your region/area and blessed by the AHJ. those the neutral and the ground will be seperatered in the house
panel!

If your using EMT or Ridge in the stack the locknut is considered a means or bonding and because it is under 250V to ground, also a Code Article.

You really need to call your AHJ to have them decribe what they want which in most cases will not supercide the POCO, per your area.

Clear as Mud ?

Hope that Helps!
 
Last edited:
thx in advance, and it does make sense to call AHJ and i will monday morning. i work in the miami area down here in florida, and as soon as i get a response i'll post it. if you go back and reveiw my question in the beginning . the only thing i can come up with is, if for example, i use PVC from the load side of the meter to a main disconnect with two hots to supply line to line loads or even 3 phase loads ( no neutral is ran from meter to main disconnect). then i would route my equipment bonding jumper with the service entrance conductors. when would be an application of that , well a warehouse that has a lot machinery and little lighting load. Of course line to neutral loads would be a separate main disconnect. i hope it makes sense, need second opinion though
 
jca0108 said:
infinity has a point about the secondary of a transformer,but the only thing is that in 250.102(C) deals with SERVICES.
Click to expand...

It's not only for services:

250.30 Grounding Separately Derived Alternating-Current Systems.
(2) Equipment Bonding Jumper Size. Where an equipment bonding jumper of the wire type is run with the derived phase conductors from the source of a separately derived system to the first disconnecting means, it shall be sized in accordance with 250.102(C), based on the size of the derived phase conductors.
Click to expand...
 
This can also apply to the service. A rigid riser is bonded to the meter through the use of the hub on the meter. But if you have a metal conduit between the meter and the service disconnect, and there is a concentric or eccentric knockout, that conduit will need to have a bonding bushing (250.92), with a conductor attached to it sized according to 250.102(C), the equipment bonding jumper.
 
Status
Not open for further replies.
Top