Cable Schedule
A cable schedule is the master register of every electrical and instrumentation cable installed at a facility. It records cable number, type, size and core count, from-end device, to-end device, route, length, and termination details. The cable schedule is the document the cable-pulling crew works against, and the document the panel-builder references when wiring marshalling cabinets.
Read one of your own drawings.
Drop a P&ID, instrument index, or schedule. Tagsight reads it to the tag and opens a workspace you keep when you sign in.
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A cable schedule is the master register of every electrical and instrumentation cable at a facility, and it is the document the cable-pulling crew and the panel builder actually work from. Each record carries the cable number, the type and construction, core or pair count, conductor size, screening, armour, the voltage and insulation class, the from-end device and its termination, the to-end panel and terminal numbers, the route, the length, and the as-installed and test data filled in during construction. It is built by combining several sources. The I/O list and equipment list say what has to be connected, and the layout and routing drawings say how far and along which tray or duct each cable runs. That second input is the important caveat for anyone expecting it to come off a P&ID, because the data that makes a cable schedule a cable schedule, route, length, tray reference, termination point is physical-layout information the P&ID does not carry. A reading of the drawing set produces the upstream half, the structured tag and signal inventory that says which connections exist, and that inventory is the precondition for the schedule. The routing and length come from the layout drawings. The honest way to turn an existing cable schedule into structured data is to digitize the cable-schedule document you already have, not to imply the P&ID yields it.
What columns belong on a cable schedule.
Cable number, per the project numbering convention. Cable type and size, e.g. 2C 1.5 mm2 IS Pr or 3C 4 mm2 SWA plus 1C earth. Cores or pairs. Insulation rating. Voltage class. From-end. Device tag, terminal box, gland plate position. To-end. Panel, terminal block, terminal numbers. Route reference, cable tray, conduit, direct buried. Length, allowing for routing margin. Termination kit details. Test certificate reference. Pulled-and-terminated date for as-built tracking.
How the schedule gets built.
The I/O list, the equipment list, and the layout drawings combine to size and number the cables. Each tag in the I/O list maps to one or more cores in a multicore signal cable. Instrument-air solenoids and motor starters drive separate power and control cabling. The cable schedule grows iteratively from a layout-driven draft to a construction-issue document. Late changes, an added instrument, a re-routed equipment package trigger cable-schedule revisions that the field crew has to reconcile against the as-installed condition.
Frequently asked.
Is the cable schedule the same as the cable list.
Usually yes. The terms are used interchangeably in most operating company documentation. Some projects distinguish a high-level cable list, just cable numbers and broad categorization from the full cable schedule, every column the cable-pulling crew needs. The distinction is documentation-style rather than fundamental.
Does Tagsight produce the cable schedule directly.
Tagsight produces the I/O list and instrument index as foundational inputs. The cable schedule is a downstream document that requires layout information, cable-tray routing, distances which the P&ID does not carry. The structured I/O dataset is the precondition for a cable-schedule build. The routing and length data come from the layout drawings rather than the P&ID set.
How is a cable schedule used during construction and commissioning.
During cable pulling, the crew marks each cable number as pulled and records the as-installed length for the as-built revision. During termination, the schedule shows which terminal in the junction box and marshalling cabinet each core connects to. During pre-commissioning continuity and insulation checks, the schedule is the reference that tells the technician which cable pair to test and what result to expect. Discrepancies between schedule and as-found condition are recorded as punch-list items before commissioning can proceed.