Typical foundation details are provided for guidance only and the soil conditions should be checked by the client before use with a qualified engineer.

CU Lighting will only accept responsibility for foundations that have been specially designed for a site and in order to do so we will require a site investigation to have been completed to provide the information we specify.

Special designs are not provided free of charge.

This is a short review of typical foundation details for flanged columns.

For Flange Base Details and Bolt Specification refer to the flange details.

Method of using this review:
1 Select relevant column from tables
2 Look up Max OTM (Overturning Moment) for the Column to be used
3 The typical foundation dimensions can now be found from the table on below.

Trenches for cables should be at least 1000mm deep and as narrow as possible. The cable should be laid on and surrounded by sand with a surround thickness of at least 150mm.

Protection tiles should be placed on top of the sand fill. The trench may then be back filled with excavated material with an "Electrical Warning" tape laid at mid depth.

Flange Loads

These moments are calculated in accordance with the loadings which are imposed under BS EN 40 for standard lighting applications

Notes:
1. Foundations should be constructed using Grade C25 concrete

2. A minimum curing period of 14 days should be allowed

3. Special precautions must be taken where aggressive ground conditions exist

4. Do not forget cable entry ducts which should exit in the centre of the foundation

5. The foundation bolts assembly must be fixed in the correct position, see instructions

6. The specified projection of bolts above the foundation must be observed

Rooted Column

Foundations for rooted columns may be:
Prepared (for bigger columns with large overturning moment) where a socket is prepared into which the column is erected and held in position while concrete poured to fill the gap.

Unprepared (for smaller columns) where a hole is excavated in good undisturbed ground and filled with at least the minimum recommended concrete surround thickness after column erection. Always remember to provide the cable duct in the correct position with respect to the cable entry slot in the column, see Rooted Column Foundation Instructions.

Method of using this review:
1 Select relevant column from tables
2 Find the Soil Type Factor G for the site conditions, see page 4 for guidance
3 The typical foundation dimensions can now be found from the table with the relevant Soil Type Factor G

Trenches for cables should be at least 1000mm deep and as narrow as possible. The cable should be laid on and surrounded by sand with a surround thickness of at least 150mm.

Protection tiles should be placed on top of the sand fill. The trench may then be back filled with excavated material with an "Electrical Warning" tape laid at mid depth.

Root Details

Typical details are provided for guidance use only and should be checked before use, by a qualified engineer

Minimum Concrete Surround Thicknesses