5 Costly Mistakes When Buying Cable Trench and Trough

Most of the money lost on cable trench and troughs orders is not lost on price. It is lost on five repeatable mistakes that are all avoidable at the specification stage — before anything is made, shipped or claimed.

Mistake 1: Cover cracking under wheel load

load class selected for pedestrian duty but installed where vehicles cross — the most common specification error on this product

How to avoid it: Put it in the specification, not in an email afterwards: the grade, the tolerance and the test that would have caught it.

Mistake 2: Trough filling with silt

no drainage provision and joints that are not sealed, so the duct path silts up over a few seasons

How to avoid it: Ask for the per-batch test record that proves the property in question — load class test; impact resistance — before the goods ship, not after they arrive.

Mistake 3: Treating every cable trench and trough quotation as the same product

Suppliers legitimately differ on material (polymer concrete versus ductile iron versus steel); load class; dimensions and wall thickness. A quotation lower than the others usually means one of those levers was moved, not that the margin was thinner.

How to avoid it: Force every quotation onto the same one-page spec — polymer concrete; ductile iron ASTM A536 as the material basis — so the price spread means something.

Mistake 4: Ignoring packing and freight until the invoice

stacked and steel-strapped per pallet, lid and base packed separately. Packing is not an afterthought on this product: under-packed goods arrive as claims, and last-minute packing upgrades at the port cost several times the factory rate.

How to avoid it: State the packing and labelling in the RFQ and make it a priced line on the quotation, so the comparison is honest.

Mistake 5: Treating every cable trench and trough quotation as the same product

Suppliers legitimately differ on material (polymer concrete versus ductile iron versus steel); load class; dimensions and wall thickness. A quotation lower than the others usually means one of those levers was moved, not that the margin was thinner.

How to avoid it: Force every quotation onto the same one-page spec — polymer concrete; ductile iron ASTM A536 as the material basis — so the price spread means something.

The one-page check before you place the order

1. Grade and standard fixed on paper: polymer concrete; ductile iron ASTM A536, to EN 124.
2. Size range confirmed: channel width 150–600 mm, depth 150–400 mm, load class A15 to D400.
3. Finish and coating stated: polymer concrete with a smooth inner face; ductile iron with bitumen or epoxy coating; steel hot-dip galvanised.
4. Test evidence agreed: load class test; impact resistance; water absorption on concrete.
5. Packing priced as a line item: stacked and steel-strapped per pallet, lid and base packed separately.
6. Minimum order and lead time understood: 200 m, 30–50 days.

Six lines, one page, zero of them optional. The suppliers who push back on any line are telling you where your order will go wrong — which is exactly the information you wanted for free.

Related: the supplier selection guide turns this checklist into ten interview questions, and the price guide explains which cost differences are real.