Amp and preamp on same outlet?

Audiolabyrinth,

Krell chose to use a 125V 15 amp plug on the unit because the 125V 15 amp duplex is the standard wall receptacle found in dwelling units, homes, in the US and Canada. Krell did choose to use the 15 amp plug for economic reasons. Not because of the price of the 15 amp plug verses a 20 amp or 30 amp plug, but because how many people in the US or Canada have NEMA 5-20R 125V 20 amp duplex receptacles in their living room, family room, parlors, libraries, dens, bedrooms, or recreation rooms? They have 15 amp duplex receptacles because NEC Code says the minimum wire size that can be used on a 15 amp branch supplying power to a 15 amp branch circuit is #14 awg wire connected to a 15 amp breaker. You will find in most cases, at least in the US, residential dwelling units are wired to NEC Code bare minimum standards.

But wait, Krell says the minimum circuit ampacity required for the Krell 700cx amp is 20 amps. Does your Krell 700cx amp have a 20 amp plug on the end of the cord? No, not by what you have said in your last post, it has a 15 amp plug. So why didn't Krell at least install a 20 amp plug on the end of the cord? Well that's easy, any fool knows a 20 amp plug will not fit, plug, into a 15 amp receptacle. Of course if Krell had installed a 20 amp plug on the end of the cord that would have required a 20 amp receptacle with #12 awg cu wire minimum, connected to a 20 amp breaker. Only a 20 amp breaker!

I asked you in my last response to you if the Krell 700cx amp is UL and or CSA Listed. My guess it is not!

As for what Chris Vanhause of Vh-Audio may have told you, I only have your side of the conversation. I would hope Chris is not telling customers it is ok to connect the furutech FI-50 Rhodium plug and Furutech receptacle to a 30 amp circuit.I suggest the manufacture of the plug and receptacle should be contacted and ask them what they have to say. IF, Furutech plugs and receptacles are UL and or CSA Listed connecting them to a branch circuit voltage or amperage circuit other than what the plug and receptacle is designed and manufactured for voids the UL Listing of the device. I would bet it also voids the manufacture warranty.

As for differences found between a 125V 15 or 20 amp plug and receptacle and that of a 30 amp receptacle I suggest you go to the local electrical supply house or Home Depot store in your area and compare them to one another.
What you will find is the 30 amp plug and receptacle contacts are about 50% bigger. Yes more surface area as well as more meat on the bone. After all the devices are designed and manufactured to handle 50% more load than the 15 or 20 amp device.
The spacing between the contacts apart from one another is greater on the 30 amp than the 15 or 20 device.

Here is some more info on the Krell 700cx amp.

Audio Video Revolution, review.

The Stereo Times, review.

I found this thread on AA.

Two 4KVA toroidal transformer in the Krell 700CX?
When connected to a 30 amp branch circuit breaker the only thing that holds that puppy back is the breaker on the back panel of the unit. I wonder if it is a 30 amp? I doubt it.

Audiolabyrinth, is it true the amp has two 4KVA power transformer?

Do you know the ampere rating of the circuit breaker mounded in the back rear panel of the amp? 15 amp? 20 amp? Do you know if it is a magnetic trip breaker only?

Another Agon thread.

09-13-10: Mclsound
thanks guys
Seems like most are using a 20amp rec. with 10awg wire and 30amp breaker.

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I will leave you with this.

If a circuit breaker is over loaded to a value of 135% it rated current, it must trip within one hour.

If a circuit breaker is over loaded to a value of 200% it rated current, it must trip within two minutes.

Electrical Forensics

So a 20 amp receptacle installed on a 30 amp breaker could be 135% overloaded for up to an hour before it is supposed to trip open.
30 amps X 135% = 40.5 amps

Has to trip open if overloaded by 200% in 2 minute.
30 amps X 200% = 60 amps

Compared to,
20 amp breaker X 135% = 27 amps.
20 amp breaker X 200% = 40 amps
.
Jim

Edit to my last post.

Do you know the ampere rating of the circuit breaker mounded in the back rear panel of the amp? 15 amp? 20 amp? Do you know if it is a magnetic trip breaker only?

Should read,
Do you know the ampere rating of the circuit breaker mounted in the back rear panel of the amp?
.

Jim, I would have to e-mail patrick at krell, he can look into your request, or you may e-mail him, patrick bresnahan, very nice guy indeed,my amp does have two huge transformers jim,this thing weighs 180 pounds out the box!, jim, I have said that this amp is NOT useing all 30 amps period, it is spiking well above 20 amps, that is all, the 30 amp breaker gives the amp room to breath so to speak of instead of being choked down!, I believe my amp does have two 4KVA transformers, the so called breaker on the back of the amp is really a power switch, turns on the amp to stand by, I took a look at it for you, it says nothing on it or around it about amps, that stereo times review is a good one, should give you some info there if I recall Jim, and my recepticle is fine, it stays cold, no heat up or some kind of trip you specified, I learn alot from you jim, but for some reason, you believe this will not work, or does not work, please listen, this works wonderfully, sounds way better than a 20 amp breaker, I do know krell has told me it is a simple thing for them to change the power to 220 on this amp instead od 120 for u.s.a., I do not know if this helps jim, I do have a owners manual on this amp here, cheers.

Jea48, another thing I wanted to say to you, first off, you have my respect, I bought this amp and refurbished it beyound oem because it is the last of the big iron of amps, it's the biggest most powerful stereo amp in krell history!, sure their may be better, I am thrilled with what this amp does jim, it's the kind I can ride off into the sunset with, I care less about the best next thing, very good sound is never absolete to me, sometimes, one needs to think about getting off the merry go round, do you believe that?, I do, tring to build something special here, krell already has informed me I am the only they know of with an amp like this that is modded, may not be the last to do all this, I do know this amp sounds hugely better than it did, all this took me two years jim, back and fourth this amp went to krell!, I have had it all complete as of december 2014, not very long at all,mated with tube equipment, it's magical sounding,cheers.