> Surge arrestors work by shunting to ground when activated, so in the case of a Type 2, all that fault current will flow through the main breaker, through the SPD to ground.
That's been my concern, is while I haven't pulled the technical those devices typically have circuit breakers built-in disconnecting them from mains at much lower currents than the main trip current. With type 3 stuff they generally trip open circuit to mains (in my experience) disconnecting them further damage. If surge current tripped the Type2 but not the main, then it stops functioning. While in the even of a lightning strike, it appears it's uncommon for measurable surge current to last more than 1ms at the strike location, the higher order oscillations must last longer than a few milliseconds in the average case.
This appears to depend heavily on the type of surge.
ChipTuner
npub1qd…3fqm7
2026-09-10 01:13:04 UTC
in reply to nevent1q…7lhh
Author Public Key
npub1qdjn8j4gwgmkj3k5un775nq6q3q7mguv5tvajstmkdsqdja2havq03fqm7Seen on
wss://nos.lolPublished at
2026-09-10 01:13:04 UTCEvent JSON
{
"id": "36223b46a1f1d93ef1d097eebab17fc0c5b90035a9c855ae2160dbfe154b187b",
"pubkey": "036533caa872376946d4e4fdea4c1a0441eda38ca2d9d9417bb36006cbaabf58",
"created_at": 1789002784,
"kind": 1,
"tags": [
[
"e",
"0000d1ac3999c5f7363552e2b638df72b95344f7eb00cf82bce7cba8c2b9ae4b",
"wss://relay.wisp.talk/",
"root",
"e2ccf7cf20403f3f2a4a55b328f0de3be38558a7d5f33632fdaaefc726c1c8eb"
],
[
"e",
"0000027934f784501f7580ed567e29e3aaacb93ff4997ea47451df24e8a0069c",
"ws://nos.lol/",
"reply",
"655f0194f141831368f4da372622062457ef73cbf1e6db1734d2c7c05e0029ca"
],
[
"p",
"e2ccf7cf20403f3f2a4a55b328f0de3be38558a7d5f33632fdaaefc726c1c8eb",
"wss://relay.bitcoinpark.com/"
],
[
"p",
"010df0c948fe9ab54d2cb7ea420ffa08d57958981b6ea68e83aaa7eb2dd3f05a",
"wss://nostr.wine/"
],
[
"p",
"036533caa872376946d4e4fdea4c1a0441eda38ca2d9d9417bb36006cbaabf58",
"wss://theforest.nostr1.com/"
],
[
"p",
"655f0194f141831368f4da372622062457ef73cbf1e6db1734d2c7c05e0029ca",
"ws://nos.lol/"
]
],
"content": "\u003e Surge arrestors work by shunting to ground when activated, so in the case of a Type 2, all that fault current will flow through the main breaker, through the SPD to ground.\nThat's been my concern, is while I haven't pulled the technical those devices typically have circuit breakers built-in disconnecting them from mains at much lower currents than the main trip current. With type 3 stuff they generally trip open circuit to mains (in my experience) disconnecting them further damage. If surge current tripped the Type2 but not the main, then it stops functioning. While in the even of a lightning strike, it appears it's uncommon for measurable surge current to last more than 1ms at the strike location, the higher order oscillations must last longer than a few milliseconds in the average case. \n\nThis appears to depend heavily on the type of surge.\n",
"sig": "3ac0c4acc0466a5709a82d54744922bce1325598b76796170670b0a897e89e23c97c317ea28663ed4b1569f3d47dc1d2ec2bbcf4f0252997e76a0afafec2dacb"
}