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Street furniture mains distribution cabinets and SPD type

STWebster

In street cabinets where there is a DNO power head and metering and consumer unit for onward power distribution circuits feeding other dependant (single or multiple) street cabinets with telecoms electronics, what type of SPD should be fitted in the parent mains street cabinet to for surge protection? Type 2 or Type 1/2 where the SPDs are external to the consumer unit?   TT earthing is used.

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    Fit type 1 and 2 at parent mains street cabinet.  Then Fit type 3 at the kit.  Some telecoms kit cost thousands of pounds.  It is also worth menting that some Telecoms kit have a built in Type 3 SPD

    The main thing to remember is to cascade. 1 then 2 then 3.  Type 1 can take a lot more abuse type 3 less so.

    It is also worth looking into what is a Lightning Stike and Lightning Stroke.  Most things while not surive a direct lightling strike but they will survive fron a local strike to a electric pylon.   

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  • 0

    Fit type 1 and 2 at parent mains street cabinet.  Then Fit type 3 at the kit.  Some telecoms kit cost thousands of pounds.  It is also worth menting that some Telecoms kit have a built in Type 3 SPD

    The main thing to remember is to cascade. 1 then 2 then 3.  Type 1 can take a lot more abuse type 3 less so.

    It is also worth looking into what is a Lightning Stike and Lightning Stroke.  Most things while not surive a direct lightling strike but they will survive fron a local strike to a electric pylon.   

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