Sunday, March 28, 2010

Compound Lighting Installation Pictures

You will find below some pictures and diagrams on the installation of compound lighting. Only one type of lighting you will see today. I will upload other types some other day.

Picture 1 – Compound lighting installation



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The construction at the above site was still in progress when I took the above picture.

The woodwork that you see around the light pole in the picture was for the landscape work. The project was in the final phase of construction.

The external lighting and landscape works were progressing in full speed.

The underground cabling for the compound lighting has been installed. The electrical contractor was then progressing with the installation of the foundation for the light poles.

The light pole in Picture 1 was installed as a mock-up unit so I could check and comment. I took some pictures at the base of the pole for reference, which you can see below.

I however rejected the mock-up unit because the internal wiring and termination was not yet carried out.

When the wiring is done, I will take some pictures and send them up here for readers who need them.

Picture 2 – Light pole mounting base



Some readers may say that this is a strange way to locate a light pole, which is above the drain. A more normal method would be more or less like the one in Picture 7.

Here the design-and-build contractor had a problem of locating a few of the compound the light poles at the open carpark area because there are several drains running between carpark boxes.

These drains were supposed to be located at the boundary of the land being developed.

However, it turned out that with the presence of the drains the actual land space for the landscaping works (e.g. trees, shrubs, etc) was too narrow to grow larger trees.

Therefore, the client agreed that the drains be relocated through the middle of the carpark area.

Construction people tend think that electrical things are very flexible and easy to be moved around just like a wiring cable.

I never liked that notion. It is true in this case, however.

Now the compound light poles have clashed with the drain. At some places, the poles have been moved to between two carpark boxes.

However, there have been concerns that accidents may damage the light poles.

As a result some poles of the compound light were located right above the drains.

The main contractor asked me how to place the pole bases on top of the drain cover.

I told them that the only real solution I have ever seen in such situations was only by constructing a cast in concrete base together with the drain, with the construction drawings of the light pole’s concrete foundation designed and endorsed by the civil work’s design consultant.

Anything less would be an experiment and I would not accept anything less because the building under construction was a high profile building and an important landmark.

A failed method of installation of the compound light poles would be extremely embarrassing for the supervising engineer, which was me.

The building owner’s resident project manager was aware of the problem and this helped me get a reliable concrete foundation for the 8 meter steel poles of the compound lighting.

Picture 3 and 4 below shows the concrete base work is progress. Observe the reinforcement steel bars used.

The completed base is what you see in Picture 2 above.

Picture 3 – Construction of a light pole foundation on top of a drain



Picture 4 – Another view of the light pole base



Picture 5 below gives another view to show the mounting bolts and nut above and below the pole’s base plate.

Picture 5 – Another view of the pole’s base plate mounting



Picture 6 – Another pole base just completed



Picture 7 – A precast light pole foundation in position



Another cast in situ pole base. I show this picture just to show the readers the entry method of the multi-core underground cable.

You can see two lengths of cables because this pole would be in the middle of the loop circuit along that light row.

If you do not understand this, leave it. I will explain the circuit in detail in future posts. With some picture too.

That was the more difficult part of the compound lighting installation in this project.
This type of electrical installations is usually simple works. Not much difficult issues.

I have more pictures on the compound lighting that I wish to upload to this blog. I am however too tired already. It’s already 4 am.

I will upload the other pictures in future posts.
Chiao.


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