what is difference between LCN SEM7820 and SEM7830?
The SEM7820 is a floor model magnet, while the SEM7830 is surface wall mounted magnet.
See here for LCN Fire Life and Safety catalog information, which includes more specific details on the SEM ...
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For surface wiring with the SEM7830 magnet; what surface metal raceway is used?
Surface Metal Raceways are commonly called Wiremold and can be found at a hardware store. This is used to run wires in many applications, such as in schools.
For Surface Metal Raceway...
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What was the LCN SEM7870 magnet?
Only available replacement part is the LCN SEM7820-825 armature.
The SEM7820-516 magnet coil might be able to use but may not be a direct replacement.
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