SPD
- Thread starter rose1981
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petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
SPD are not "sized". You have either a type 1 or 2 SPD depending on where you are located WRT to the service point. You then select a SPD rated for the voltage where it is being installed.
The instructions for the SPD will tell you what the appropriate CB rating is, if one is required at all (a type 1 SPD can be located line side of the service point with no OCPD at all).
- Location
- Placerville, CA, USA
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- Retired PV System Designer
SPDs can indeed be sized based on their energy absorbing limit before failing.
This is not solely dependent on the class and the voltage.
Two identical SPDs in parallel will have twice the energy absorbtion capacity as one alone.
This does *not* necessarily mean that one manufacturer will offer more than one size.
As a very general rule a Type 2 with a higher energy rating will also call for a larger CB.
This is not solely dependent on the class and the voltage.
Two identical SPDs in parallel will have twice the energy absorbtion capacity as one alone.
This does *not* necessarily mean that one manufacturer will offer more than one size.
As a very general rule a Type 2 with a higher energy rating will also call for a larger CB.
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