AC Power

 

AI Overview

 

The 30-foot (10-meter) minimum conductor distance requirement for Type 3 Surge Protective Devices (SPDs) from the service or separately derived system disconnect is a safety measure to ensure that the SPD is located beyond the area potentially affected by a surge, which is typically considered to be within 30 feet of the main panel.

 

Here’s a more detailed explanation:

• Purpose of the 30-foot Distance:

  The 30-foot distance requirement is based on the idea that a surge, such as a lightning strike, will have the most significant impact on equipment within that immediate vicinity of the main electrical panel.

   

• Type 3 SPD Location:

  Type 3 SPDs are designed to protect equipment at the point of utilization, meaning they are installed on the load side of branch-circuit overcurrent protection, but only if the connection is a minimum of 30 feet away from the service or separately derived system disconnect.

   

• Protection Beyond the Main Panel: By placing the Type 3 SPD beyond the 30-foot zone, it’s less likely to be directly affected by the surge, allowing it to function more effectively.

Hi @jea48

In addition to the conversation not really going anywhere, I feel it’s also being less than cordial, so I’m checking out.

 

 

Be well,

 

Erik

@erik_squires said:       03-20-2025 at 07:48am 

In addition to the conversation not really going anywhere, I feel it’s also being less than cordial, so I’m checking out.

LOL, "being less than cordial". LOL

 

@erik_squires  said:    03-19-2025 at 04:12pm 

It may help you to understand that the MOV’s in an SPD’s for the most part deliberately CAUSE shorts (series mode an exception) which is why they must be a certain distance from the panel. This ensures the AIR of the breakers isn’t exceeded when they do short.

"It may help you to understand"

I took that as an insult.

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In addition to the conversation not really going anywhere

The conversation is settled. You were wrong.

You proved you were wrong when you introduced series mode SPDs into the conversation.

@erik_squires said:

@jea48 - Of course, always follow the rules, but the 30’ requirement AFAIK is to avoid excess current that is too high for the AIR (current interrupt rating) of panel breakers.

( should be AIC not AIR).

in response to my post:       03-19-2025 at 03:43pm

The 30ft minimum distance requirement has to do with the fault current rating of the Type 3 SPD . Any idea what the Furman is rated at?      

(FYI, It was you that introduced AIR instead of AIC into the conversation. My bad for not catching it and correcting it at the time.
 

Series mode SPDs blows your above statement out of the water.

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Best regards,

Jim

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I’ve seen this thread happen dozens of times on this website. I always thought that the first part of engineering a component was getting control of the electricity. Isn’t that what happens starting with a fuse and then there’s rectifiers and all kinds of other stuff that steps the power down to where the engineer wants it or wants it changed from AC to DC to operate the rest of the circuitry of the component. If all this is going on I would assume that the manufacturers do it because they can’t control where the components will end up and how bad the power situation is wherever people use them. I think all this stuff is just more stuff to sell people who get bored with their hobby. A couple years back all the rage was these different colored fuses for hundreds of dollars and then crazy $10,000 power cords. Sounds to me like a whole lot of people that got more time than money or is that more money than time I don’t know but the whole thing sounds like a waste. My equipment sounds great wherever I have it

@raysmtb1 Not an uncommon perspective. Interesting you don’t believe in power improvements as you have a nice system. You seem to believe in vibration isolation, but not power. I only know that the 2400 without question improved the overall sound of my system. YMMV

@erik_squires My new (arrived today) Furman PST-8D & has further cleaned up my system. Not as dramatic as the 2400, but audible.
I assume it was the conditioned and isolated power to the router feeding my Qobuz streaming, but you would know better than me. Got it open box on eBay for just over $100.00. Great addition. Thanks again for your sage advice. I am getting close to end stage… maybe.🤔