SPD
- Thread starter rose1981
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bphgravity
Senior Member
- Location
- Florida
The SPD configuration type identifies the system/voltage the SPD is designed to be installed on. Incorrect application will likely result in SPD failure.
Everything you need to know about Surge Protection Devices at the NEMA Surge Protection Institute: http://www.nemasurge.org/
Everything you need to know about Surge Protection Devices at the NEMA Surge Protection Institute: http://www.nemasurge.org/
jbelectric777
Senior Member
- Location
- NJ/PA
A surge protector (or surge suppressor) is an appliance/device designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or by shorting to ground any unwanted voltages above a safe threshold
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
If I have a 120/240 grounded delta or a 138/240Y, would I choose a wye or delta suppressor?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
As best I can recall the SPD makers make a suppressor for that system.
If not, check with the manufacturer and see what they say.
jbelectric777
Senior Member
- Location
- NJ/PA
Rose - Service transfigurations are: 120/240 three phase Delta 120/208 three phase wye 277/480 three phase wye and the last one I am going to name is rarely used but its called a three phase open delta, they only use it when absolutely necessary because the transformer can only be loaded to 60% (sometimes its used for a few homes) then you also have single phase 120/240 which is just two phases from a three phase delta. I'm not a lineman but we had a maintain contract for an airfield. Are you in the USA ? The counter man should be able to help you. If you just need a lightning surge protector its pretty basic, one side is connected to ground and all two or three phases connect to terminals 1-2-3 and all that's between ground and the phases is a very small air gap allowing the lightning to "track" or "jump" across it to ground thus redirection saves expensive items in a building. Now a surge protector is more involved, I call it a clipper because it only allows it to get to a pre determined level and then drains it off. The power company usually has them on their poles as well. 1
jbelectric777
Senior Member
- Location
- NJ/PA
Rose - Service transfigurations are: 120/240 three phase Delta 120/208 three phase wye 277/480 three phase wye and the last one I am going to name is rarely used but its called a three phase open delta, they only use it when absolutely necessary because the transformer can only be loaded to 60% (sometimes its used for a few homes) then you also have single phase 120/240 which is just two phases from a three phase delta. I'm not a lineman but we had a maintain contract for an airfield. Are you in the USA ? The counter man should be able to help you. If you just need a lightning surge protector its pretty basic, one side is connected to ground and all two or three phases connect to terminals 1-2-3 and all that's between ground and the phases is a very small air gap allowing the lightning to "track" or "jump" across it to ground thus redirection saves expensive items in a building. Now a surge protector is more involved, I call it a clipper because it only allows it to get to a pre determined level and then drains it off. The power company usually has them on their poles as well.
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
But how do you know which one? For example I see 240 delta, but is that for ungorunded delta or 120/240 delta?
A SPD would fail if more than its rated voltage is applied to it. So, better, choose a SPD rated for ungorunded delta in your case.
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