Definition clarification

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mikehughes8

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I primarily work on MV and HV distribution systems so my job is usually complete at the utility transformer. I have never had these definitions clear in my mind I have just known how everything is connected. I have decided that today is the day to clear this up.
Now the hypothetical portion: (3p 4wire system) From the utility XFMR parallel runs of 500mcm 4c 90c(direct burial rated) conductor are connected to a 800A main disco. This main disco subsequently feeds (4)
200A panels (one on each of (4) buildings) using 3/0 4c 90c w/ground.

1) Where is my service point?
2) What constitutes my services conductors?
3) Service lateral?
4) Service equipment?
5) Service Entrance Conductors?

I have read the definitions but want to make sure I have this right.


I am only a senior member because I have asked at least 100 stupid questions :)
 
mikehughes8 said:
I primarily work on MV and HV distribution systems so my job is usually complete at the utility transformer. I have never had these definitions clear in my mind I have just known how everything is connected. I have decided that today is the day to clear this up.
Now the hypothetical portion: (3p 4wire system) From the utility XFMR parallel runs of 500mcm 4c 90c(direct burial rated) conductor are connected to a 800A main disco. This main disco subsequently feeds (4)
200A panels (one on each of (4) buildings) using 3/0 4c 90c w/ground.

1) Where is my service point?
2) What constitutes my services conductors?
3) Service lateral?
4) Service equipment?
5) Service Entrance Conductors?

I have read the definitions but want to make sure I have this right.


I am only a senior member because I have asked at least 100 stupid questions :)
Click to expand...


1. At the 800 Amp disconnect.
2. That could be a little tricky.
2a. If you have a lateral, and the lateral enters the switch gear, there are no Service Entrance Conductors (SEC).
2b. If there is a property box, then the SEC start at the splice in the property box.
2c. If there is an End Line Box, the SEC start at the splice in the ELB.

There can be other scenarios depending on the tariff laws, but that is the easy answer for #2, 3 & 5.
Service Conductors and Service Entrance Conductors are the same conductors, there is just more detail with SEC, in regards to overhead or underground.

4. Service equipment is the 800 amp switch or 800 amp switch gear, whichever you may have.
 
mikehughes8 said:
. . .
1) Where is my service point?
2) What constitutes my services conductors?
3) Service lateral?
4) Service equipment?
5) Service Entrance Conductors?
Click to expand...
  1. Depends on who installs, owns, and maintains the service lateral. If it is the customer, it is in the transformer and they are service entrance conductors (the code calls them the service lateral but we are trying to change that); if it is the electric utility, it is at the point of transition to the premises wiring (at the service equipment)
  2. If you install, owns, and maintain them, it is the service lateral.
  3. They are the conductors I have just been talking about.
  4. 800 ampere service equipment.
  5. See #1
After the 2011 code is finished and if we are successful, the service drop and service lateral terms will be utility owned and installed only. :smile:
 
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