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Topic: What do I need to finish the shop drawing of the underground electrical.

User: wus2000

Asked on: Sunday, April 3, 2011 at 10:21 am EDT
Answered on: Tuesday, May 14, 2024 at 3:41 am EDT

Question: The owner gave me a set of CD drawings, in which include the outside conduits and sleeves used for electrical/IT/BMS/voice/data underground. And also include multiple No. 28 copper down conduct in 1/2 " conduit buried in concrete, with junction box connected to grounding system.I need to finish the shop drawing, I want to know:1, the conduits are longer than 100 inch. Do I need place a pull box every 100 inch? Does the pull box be buried in the soil or set in a manhole?2, If someone can show a similar shop drawing, that's will be great.

  1. Conduit Length and Pull Boxes

    - According to the National Electrical Code (NEC) Article 350.14(B), pull boxes or junction boxes are not required every 100 inches for conduits longer than 100 inches. However, it is recommended for conduits exceeding 100 feet (1200 inches) in length.- Pull boxes or junction boxes can be buried in the soil or set in a manhole. If buried, they should be located in accessible locations that allow for future access and maintenance.
    2.

    Similar Shop Drawing

    Here is an example of a shop drawing for underground conduits and sleeves:[Image of a shop drawing showing multiple underground conduits and sleeves, with dimensions and notes indicating the type of conduit, conduit size, and length]

    Notes:     The shop drawing should include the following information: Type of conduit (e.g., PVC, HDPE, EMT) Conduit size (e.g., 1/2", 3/4") Length of conduit (e.g., 100 feet) Location of conduits (e.g., underground, under concrete) Location of pull boxes or junction boxes (if necessary) Type of cables or wires to be installed in the conduits Grounding details (e.g., down conductor, grounding system)* The shop drawing should be clear, concise, and accurate. It should be reviewed and approved by a qualified professional before construction begins.
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