What does the product table distinguish?
Wheatland Tube's brochure has separate trade-size and outside-diameter columns, with different tables for EMT, IMC and other conduit products. In its 10-foot EMT table, the 1-inch trade size has a listed outside diameter of 1.163 inches. The trade designation is therefore not the same dimension.
Data Center Estimating is independent and is not affiliated with Wheatland Tube. This catalog example is not an approved project selection, an installation rule or a basis for choosing a penetration size. Use the actual selected product and current approved detail.
What belongs in the takeoff cross-check?
Retain the material and conduit type in the quantity description. A line saying only one-inch conduit leaves important product and accessory questions unanswered.
| Takeoff field | Record | Reason |
|---|---|---|
| Designation | Trade size as specified | Ordering identity |
| Product | EMT, IMC or selected type | Different dimensional basis |
| Dimensions | Applicable catalog revision | Actual product envelope |
| Accessories | Approved coupling and connector types | Not the bare tube alone |
| Supports | Approved clamp or support reference | No diameter-only selection |
| Penetrations | Approved detail and scope owner | No assumed opening allowance |
How can a product substitution affect a quantity review?
Illustrative example. A fictional data center estimate copies the numeral from a conduit trade-size column into an outside-diameter field. A later product substitution preserves the trade-size label, so the reviewer assumes the support and penetration schedule needs no further check.
The correct review keeps the route quantity separate from dimensional compatibility. It checks the selected conduit family, accessory envelope and approved interface detail, then records any actual scope change. It does not automatically add supports, enlarge openings or price a guessed rework quantity.
What should remain an open estimate input?
Where the product family or interface detail is unconfirmed, name that missing reference and the responsible reviewer. Keep any approved allowance explicit. Do not present a dimension inferred from a trade label as a measured or approved quantity.
This worksheet does not calculate conductor fill, bending space, firestop requirements or structural capacity. Engineering sign-off is performed only by the registered engineer on the job.
Common questions
What else should the bid team know?
Is trade size the actual outside diameter?
No. Read the selected product's dimensional table.
Can different conduit types share a trade-size label?
Yes. Preserve the type and its actual dimensional reference.
Does this example choose a hole or clamp size?
No. Use the approved system and interface details.