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19/04/2012


 

Lampholders - How to install lampholders

 

And who may this Giovanni Sagni from the city of Sesto Calende , in the province of Varese , located precisely where Italy 's Lake Maggiore becomes the Ticino ?

No use looking for him on the Internet: he is not there. Yet he did exist, and his name is associated with an interesting invention in the technical lighting sector.

E14
E27
B22 G4
GZ4
GX5,3
GY6,35
R7s Rx7s
Rx7s-24
Rx7s-26
Rx7s-32
G5 G23

You need to know that , between the end of the nineteenth century and the beginning of the twentieth century, energy was often paid in a lump sum, so subscribers to the electricity distribution service for lighting purposes often illegally replaced the light bulbs specified in their contract with others offering greater "illuminating power". This practice is widely described in documents of that time, which noted how it was a veritable fraud (at times done in good faith, but certainly not always) to the detriment of the electrical company, which was forced to supply more electricity than what it was paid for and, moreover, to deal with unexpected and excessive voltage drops, with all the consequences from an engineering standpoint..

So how was this problem solved? By simply providing lampholder users with different types of connections, as indicated in a text of that period so that, for example, the 10-candle ones cannot be screwed on 5-candle lampholders, nor the 16-candle ones on 10-candle lampholders and so on. So did that take care of things? Certainly not. First of all, the customer had to keep a significant number of light bulbs in stock, to go with the different types of connections. Lastly, in order to change the power of the lamp one also had to change the lampholder. And this is where Sagni comes into the picture. In 1902, he invented a lampholder that holds lamps made by all manufacturers and with any power rating, provided that this change was done exclusively by the lamp manufacturer. This was also useful in meter installations, and not only the flat rate ones, as the texts of the time tell us that when unscrewing the light bulbs, users often damage them and sometimes even unscrew the porcelain ring that isolates the lampholder, causing short circuits.

 

And today?

More than a century has gone by and these problems have been solved for good. Simply look through the Scame catalogue to find lampholders to please everyone: in thermoplastic, in heat-hardening polyester, in brass-plate metal, in ceramics, wall-mounted, for illuminating chains, for fluorescent lamps, for linear halogen lamps, with all the relevant fittings. Moreover, the actual connection is available in the most popular ranges: E27, E40, E14, G5, G23. At the time, Universal was considered to be "solid and elegant": and the Scame lampholders can certainly lay claim to these two characteristics.

So, hooking up a lamp to the electrical system is certainly no problem. Perhaps there is a reason why Mr. Giovanni Sagni from Sesto Calende is not mentioned anywhere on the Internet.

 


Learn more
- Products: Lampholders and inline switches

 

Rev.15.0126      

 

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