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Old 12-08-2019, 11:56 AM   #1
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Direct Bus vs Breaker for Surge protector


Just bought a HEPD80 for a sub panel that is for lighting. The instructions offer two ways to mount, Direct Bus or with a breaker but it doesn't give any pros or cons with either way. My research has found tons of posts about breaker location closest to the supply and lack of breaker space. But with direct bus it seems to me to make all that moot and easier to install. I haven't found one post about direct bus.
Any insight would be appreciated.
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Old 12-08-2019, 12:41 PM   #2
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Re: Direct Bus vs Breaker for Surge protector


Direct buss connection means killing the main breaker anytime you work on it or replace it. With a breaker, you only have to kill the one breaker. (You wonít have to reset clocks or other electronic settings)
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Old 12-08-2019, 12:47 PM   #3
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Re: Direct Bus vs Breaker for Surge protector


It's a sub panel so it's on a 100 amp breaker in the main so no big deal there. I guess my concern is the HEPD80's wires are 12 gauge, wouldn't they be underrated for 100 amp direct?
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Old 12-08-2019, 01:15 PM   #4
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Re: Direct Bus vs Breaker for Surge protector


Itís not a problem, surges are very short duration. The wires wonít heat up to a problem point in a couple of cycles.

When you put it on a breaker, SQ D recommends a 20 or 30 amp 2 pole breaker. The breaker isnít there to protect the surge protector. It isnít supposed to trip during the surge. Itís more of a disconnect and easy connection to the bus.
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Old 12-08-2019, 01:49 PM   #5
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Re: Direct Bus vs Breaker for Surge protector


Thanks.
Makes sense, so does using a breaker. I have spares here so putting a 20 on is no big deal and the better way to go.
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