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What is the difference between S1 and S2 mounting springs?

What is the difference between S1 and S2 mounting springs?

 
The difference between S1 and S2 mounting springs lies in the application purpose. S1 springs are used in a hollow ceiling (e.g. plasterboard or wooden plates), while S2 springs are used in a concrete ceiling (e.g. concrete slabs or vaults).
 
Another difference between S1 and S2 springs is the way of placement.
 
S1 springs are ‘open’ – with the legs up – when they are placed into the ceiling. The legs then press down to fasten the spotlight.
 
S2 springs are ‘closed’ – with the legs down – when they are placed into the ceiling. The legs then press to the outside to fasten the spotlight. These S2 springs can also be used in a square hole.
 
Foto: Verschil-S1-en-S2-inbouwveren

S1 System

Springs for hollow surfaces.
For example: Plasterboard or wooden plates
 

S2 System

Springs for solid surfaces
For example, in: concrete, vaults, etc.
 

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