| Author |
Message |
Pooh Bear
Guest
|
 Posted:
Sun Nov 28, 2004 6:19 am Post subject:
a question about power from the wall socket |
|
|
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
How do you get round it if it is a problem ?
Oh and what *really is* the voltage at the socket in practice ? In
cities at least.
Cheers, Graham
|
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Mike T.
Guest
|
| Posted:
Sun Nov 28, 2004 6:19 am Post subject:
Re: a question about power from the wall socket |
|
|
On Sun, 28 Nov 2004 03:23:52 +0000, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:
| Quote: | A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
|
Yes.
| Quote: | How do you get round it if it is a problem ?
|
Most venues where sound systems and stage lighting are used make some
provision for their power requirements. In Canada, it is common to see
one or two "range outlets" backstage. These are 240V 50A 4-wire
sockets, originally designed for household electric cook stoves. It
includes a neutral wire, a ground wire, and two hot wires. You can
measure 120V between each hot wire and the neutral, and 240V between
the two hot wires. A plug-in distribution panel can break this down
into whatever 120 or 240 volt circuits are required, to a total of
12KW.
Larger venues provide 100A three-phase circuits (36KW), requiring a
larger distribution panel.
Smaller venues provide only 120V 15A (often 20A, in the US) circuits.
You need to find enough different circuits to power all the amplifiers
and lights.
| Quote: | Oh and what *really is* the voltage at the socket in practice ? In
cities at least.
|
In Canada, usually 116 to 122V 60 Hz. The total circuit rating is the
same as the socket rating: 15A.
Regards,
Mike T. |
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Phil Allison
Guest
|
| Posted:
Sun Nov 28, 2004 11:33 am Post subject:
Re: a question about power from the wall socket |
|
|
"Pooh Bear"
| Quote: |
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
|
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
............ Phil |
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Timo Wildschut
Guest
|
| Posted:
Sun Nov 28, 2004 12:17 pm Post subject:
Re: a question about power from the wall socket |
|
|
Pooh Bear wrote:
| Quote: | A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
How do you get round it if it is a problem ?
Oh and what *really is* the voltage at the socket in practice ? In
cities at least.
Cheers, Graham
In Holland the power is 230v phase to ground and something abouth 400v |
phase to phase.
Typical one phase circuit rating is 16A (3680w) although the sockets
itself are rated 10A cont but everyone seems to ignore this :-)
Most household main circuits are rated 35A for onephase systems or 3x25A
for 3-phase systems.
Most clubs have larger maincircuits, ranging from 3x35A to 3x1000A.
Timo |
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Pooh Bear
Guest
|
| Posted:
Sun Nov 28, 2004 12:17 pm Post subject:
Re: a question about power from the wall socket |
|
|
Phil Allison wrote:
| Quote: | "Pooh Bear"
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
|
Well..... that's what triggered the question.
Funnily enough, on Friday I was looking at some QSC figures for current
comsumption too.
We've been asked to produce a 120V version of our new amplifiers you see. A
surprise actually but we're in the process of re-establishing a relationship
with the guy who formerly fronted Studiomaster in the US.
Just wondering if the circuit breakers might trip on music input !
Graham |
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Bob Urz
Guest
|
| Posted:
Sun Nov 28, 2004 6:22 pm Post subject:
Re: a question about power from the wall socket |
|
|
Pooh Bear wrote:
| Quote: | Bob Urz wrote:
Pooh Bear wrote:
Phil Allison wrote:
"Pooh Bear"
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
Well..... that's what triggered the question.
Funnily enough, on Friday I was looking at some QSC figures for current
comsumption too.
We've been asked to produce a 120V version of our new amplifiers you see. A
surprise actually but we're in the process of re-establishing a relationship
with the guy who formerly fronted Studiomaster in the US.
Just wondering if the circuit breakers might trip on music input !
Graham
What you have to remember is live music is NOT continuos pink noise or
sine waves. So the duty cycle is much less than the continuos figures
you are looking at.
Oh indeed. The saving grace. But in Europe ( and everywhere that's 220-240 V ) there's
so much power available from the wall socket anyway that we don't need to even bother
about it.
In permanent installs, we frequently use 1/2 to 1/3
the maximum draw figure for our working power figure.
Also, you can get more than 15 amps out of a 120 volt outlet. There are
20 amp edison outlets. Then have an extra side prong in the socket to ID
them. You can also get more than that if you use twist locks.
Yup, I'm aware of them.
How often do you come across them already installed in practice ? In a pub / club
environment say ?
20 amp 120 volt outlets are NOT common. Unless someone speced them when |
a club was being built or retro fitted, common outlets are 15 amp.
A lot of clubs will have a range plug or such with a custom pigtail for
distribution. A lot of these temporary power drops technically don't
meet the requirements of the US NEC, but you see them a lot anyway and
most of the time its not an issue. You will see someone slap a 4x4 box
with 4+ outlets on it on a plywood board with a range plug pigtail.
technically, since the components are not "listed" for temporary use but
for permanent installation, its not technically in code compliance.
Bob
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sid
Guest
|
| Posted:
Sun Nov 28, 2004 6:22 pm Post subject:
Re: a question about power from the wall socket |
|
|
Timo Wildschut <somewhere@earth.sure> wrote in message news:<cocaks$6md$1@news1.zwoll1.ov.home.nl>...
| Quote: | Pooh Bear wrote:
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
How do you get round it if it is a problem ?
Oh and what *really is* the voltage at the socket in practice ? In
cities at least.
Cheers, Graham
In Holland the power is 230v phase to ground and something abouth 400v
phase to phase.
Typical one phase circuit rating is 16A (3680w) although the sockets
itself are rated 10A cont but everyone seems to ignore this :-)
Most household main circuits are rated 35A for onephase systems or 3x25A
for 3-phase systems.
Most clubs have larger maincircuits, ranging from 3x35A to 3x1000A.
Timo
The U.K has 240v going everywhere and every appliance has a massive |
step down transformer to bring it down to usable voltage. The U.S.
only puts high voltage where its needed.Most homes in the U.S. have
washers and dryers using 220v. The outlet is wired bridged for
this.Makes more sense than have the deadly voltage that running
through your typical old damp English house.R.I.P. electrocuted
English Rock Stars!!! |
|
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|
|
Doug Schultz
Guest
|
| Posted:
Sun Nov 28, 2004 6:22 pm Post subject:
Re: a question about power from the wall socket |
|
|
"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:41AA0C33.B5611C5@hotmail.com...
| Quote: | Bob Urz wrote:
Pooh Bear wrote:
Phil Allison wrote:
"Pooh Bear"
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V (
UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are
respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) -
not
sure of the European figure but probably similar. So you can drag
plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on
both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
Well..... that's what triggered the question.
Funnily enough, on Friday I was looking at some QSC figures for current
comsumption too.
We've been asked to produce a 120V version of our new amplifiers you
see. A
surprise actually but we're in the process of re-establishing a
relationship
with the guy who formerly fronted Studiomaster in the US.
Just wondering if the circuit breakers might trip on music input !
Graham
What you have to remember is live music is NOT continuos pink noise or
sine waves. So the duty cycle is much less than the continuos figures
you are looking at.
Oh indeed. The saving grace. But in Europe ( and everywhere that's 220-240
V ) there's
so much power available from the wall socket anyway that we don't need to
even bother
about it.
In permanent installs, we frequently use 1/2 to 1/3
the maximum draw figure for our working power figure.
Also, you can get more than 15 amps out of a 120 volt outlet. There are
20 amp edison outlets. Then have an extra side prong in the socket to ID
them. You can also get more than that if you use twist locks.
Yup, I'm aware of them.
How often do you come across them already installed in practice ? In a pub
/ club
environment say ?
We have to supply a power lead with the product - so it'll be the 15 A
version. Safety
regs mean that the product therefore has to be fused / breakered at 15 A
too.
I'm wondering if you might see the breaker fittted in the amp tripping
with high powers
and low load impedances.
http://www.hammondmfg.com/1589RM.htm
The secret these days to high power out of 120 volts is switching power
supplies
And power factor correction !
and digital amplification. WIth the extra efficiency of both,
you can squeeze more power out.
No problem with that - but we're talking class AB amps we already have in
production
here.
My buddy is running his crest 8200's off
of a single 120 volt 20 amp outlet with no problems. Now, his old school
Crest 10004 needs two power cords and circuits to power it off of 120
volts.
But that's a big beast !
If one were building a truly monstrous amp, i would use a switching
power supply that would run on either 120 or 220 volts. Then it would be
smart enough to derate its power output if necessary on 120v.
We're moving towards switching supplies as it happens. Class G and H
output stages help
a lot too with efficiency.
Switching amps in due course too.
Graham
|
when I do live sound I bring in my own distribution so there is no need to
wonder whether the club has the proper outlet for my gear.
it also helps prevent grounding issues because I know that everything is
grounded at the same point in the panel and that everything is actually
grounded.
most people that do live sound and lighting here in Vancouver Canada do the
same thing. You cant expect a venue to have enough outlets where you need
them but most Venues have tie in points of up to 400A 3phase.
Doug |
|
| Back to top |
|
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Bob Urz
Guest
|
| Posted:
Sun Nov 28, 2004 6:22 pm Post subject:
Re: a question about power from the wall socket |
|
|
Pooh Bear wrote:
| Quote: | Phil Allison wrote:
"Pooh Bear"
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
Well..... that's what triggered the question.
Funnily enough, on Friday I was looking at some QSC figures for current
comsumption too.
We've been asked to produce a 120V version of our new amplifiers you see. A
surprise actually but we're in the process of re-establishing a relationship
with the guy who formerly fronted Studiomaster in the US.
Just wondering if the circuit breakers might trip on music input !
Graham
|
What you have to remember is live music is NOT continuos pink noise or
sine waves. So the duty cycle is much less than the continuos figures
you are looking at. In permanent installs, we frequently use 1/2 to 1/3
the maximum draw figure for our working power figure.
Also, you can get more than 15 amps out of a 120 volt outlet. There are
20 amp edison outlets. Then have an extra side prong in the socket to ID
them. You can also get more than that if you use twist locks.
http://www.hammondmfg.com/1589RM.htm
The secret these days to high power out of 120 volts is switching power
supplies and digital amplification. WIth the extra efficiency of both,
you can squeeze more power out. My buddy is running his crest 8200's off
of a single 120 volt 20 amp outlet with no problems. Now, his old school
Crest 10004 needs two power cords and circuits to power it off of 120 volts.
If one were building a truly monstrous amp, i would use a switching
power supply that would run on either 120 or 220 volts. Then it would be
smart enough to derate its power output if necessary on 120v.
Bob
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Pooh Bear
Guest
|
| Posted:
Sun Nov 28, 2004 6:23 pm Post subject:
Re: a question about power from the wall socket |
|
|
Bob Urz wrote:
| Quote: | Pooh Bear wrote:
Phil Allison wrote:
"Pooh Bear"
A question for those in N America.
Here in Europe we have an ac supply from the wall socket of 240V ( UK )
and 220V ( rest of Europe ). That's despite the paper 'harmonisation'
calling it 230V ! The current ratings of the connectors are respectively
13 and 16 Amps - giving more than 3kW available to a single outlet.
The typical circuit rating in the UK is 30 Amps ( nearly 7.5 kW ) - not
sure of the European figure but probably similar. So you can drag plenty
of watts out a typical home / office / pub-club style circuit with no
trouble
The US socket is 120V ( officially ) @ 15 A. Only 1800W per outlet.
Don't know the total 'circuit rating'.
Does this present a practical problem when gigging with multi-kilowatt
amplifiers and systems ?
** From a 120 volt, 60 Hz AC outlet and when driving 4 ohm loads on both
channels to rated power a QSC:
PL 1.8 draws 24.9 A rms.
PL 4.0 draws 56.7 A rms.
PL 6.0 PFC draws 72 A rms.
PL 9.0 PFC draws 87 A rms.
** Conclusion : USA power points must have heaps ;-)
Well..... that's what triggered the question.
Funnily enough, on Friday I was looking at some QSC figures for current
comsumption too.
We've been asked to produce a 120V version of our new amplifiers you see. A
surprise actually but we're in the process of re-establishing a relationship
with the guy who formerly fronted Studiomaster in the US.
Just wondering if the circuit breakers might trip on music input !
Graham
What you have to remember is live music is NOT continuos pink noise or
sine waves. So the duty cycle is much less than the continuos figures
you are looking at.
|
Oh indeed. The saving grace. But in Europe ( and everywhere that's 220-240 V ) there's
so much power available from the wall socket anyway that we don't need to even bother
about it.
| Quote: | In permanent installs, we frequently use 1/2 to 1/3
the maximum draw figure for our working power figure.
Also, you can get more than 15 amps out of a 120 volt outlet. There are
20 amp edison outlets. Then have an extra side prong in the socket to ID
them. You can also get more than that if you use twist locks.
|
Yup, I'm aware of them.
How often do you come across them already installed in practice ? In a pub / club
environment say ?
We have to supply a power lead with the product - so it'll be the 15 A version. Safety
regs mean that the product therefore has to be fused / breakered at 15 A too.
I'm wondering if you might see the breaker fittted in the amp tripping with high powers
and low load impedances.
| Quote: | http://www.hammondmfg.com/1589RM.htm
The secret these days to high power out of 120 volts is switching power
supplies
|
And power factor correction !
| Quote: | and digital amplification. WIth the extra efficiency of both,
you can squeeze more power out.
|
No problem with that - but we're talking class AB amps we already have in production
here.
| Quote: | My buddy is running his crest 8200's off
of a single 120 volt 20 amp outlet with no problems. Now, his old school
Crest 10004 needs two power cords and circuits to power it off of 120 volts.
|
But that's a big beast !
| Quote: | If one were building a truly monstrous amp, i would use a switching
power supply that would run on either 120 or 220 volts. Then it would be
smart enough to derate its power output if necessary on 120v.
|
We're moving towards switching supplies as it happens. Class G and H output stages help
a lot too with efficiency.
Switching amps in due course too.
Graham |
|
| Back to top |
|
|
Pooh Bear
Guest
|
| Posted:
Sun Nov 28, 2004 11:47 pm Post subject:
Re: a question about power from the wall socket |
|
|
sid wrote:
| Quote: | The U.K has 240v going everywhere and every appliance has a massive
step down transformer to bring it down to usable voltage.
|
Only the same appliances that need step down transformers in the US too !
High power amplifiers running on 120 V actually need *stup up* transformers.
Transformers are used for safety isolation anyway. Nothing to do with voltage.
| Quote: | The U.S.
only puts high voltage where its needed.Most homes in the U.S. have
washers and dryers using 220v. The outlet is wired bridged for
this.Makes more sense than have the deadly voltage that running
through your typical old damp English house.R.I.P. electrocuted
English Rock Stars!!!
|
Stupid comment by out of touch prick.
Graham |
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|
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Tim S Kemp
Guest
|
| Posted:
Sun Nov 28, 2004 11:52 pm Post subject:
Re: a question about power from the wall socket |
|
|
sid wrote:
| Quote: | The U.K has 240v going everywhere and every appliance has a massive
step down transformer to bring it down to usable voltage. The U.S.
only puts high voltage where its needed.Most homes in the U.S. have
washers and dryers using 220v. The outlet is wired bridged for
this.Makes more sense than have the deadly voltage that running
through your typical old damp English house.R.I.P. electrocuted
English Rock Stars!!!
|
Hey, we have earthing, and RCDs, and MCBs and more regulations and
protection systems than you could want. And my house isn't damp, neither is
it made of wood so as to fall apart in a hurricane.
Seppos.
--
"Get a paper bag" |
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Jason Lavoie
Guest
|
| Posted:
Mon Nov 29, 2004 12:01 am Post subject:
Re: a question about power from the wall socket |
|
|
| Quote: | 20 amp 120 volt outlets are NOT common. Unless someone speced them when
a club was being built or retro fitted, common outlets are 15 amp.
A lot of clubs will have a range plug or such with a custom pigtail for
distribution. A lot of these temporary power drops technically don't
meet the requirements of the US NEC, but you see them a lot anyway and
most of the time its not an issue. You will see someone slap a 4x4 box
with 4+ outlets on it on a plywood board with a range plug pigtail.
technically, since the components are not "listed" for temporary use but
for permanent installation, its not technically in code compliance.
Bob
|
three phase distros are usually made of parts that were intended for
permanent use too (except for the cam connectors of course) so what's
the difference?
also, I've seen many range plug panels that have passed inspection.
Jason |
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Jason Lavoie
Guest
|
| Posted:
Mon Nov 29, 2004 12:04 am Post subject:
Re: a question about power from the wall socket |
|
|
On Sun, 28 Nov 2004 17:34:43 +0000, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:
| Quote: | We have to supply a power lead with the product - so it'll be the 15 A version. Safety
regs mean that the product therefore has to be fused / breakered at 15 A too.
I'm wondering if you might see the breaker fittted in the amp tripping with high powers
and low load impedances.
|
get a really slow breaker, and with some careful averaged limiting
inside the amp you should be able to ensure that the breaker never
trips even though peaks are above 15A
Jason |
|
| Back to top |
|
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Phildo
Guest
|
| Posted:
Mon Nov 29, 2004 12:17 am Post subject:
Re: a question about power from the wall socket |
|
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"Doug Schultz" <Douglas_Schultz@hotmail.com> wrote in message
news:c5oqd.375036$%k.274180@pd7tw2no...
| Quote: | when I do live sound I bring in my own distribution so there is no need to
wonder whether the club has the proper outlet for my gear.
it also helps prevent grounding issues because I know that everything is
grounded at the same point in the panel and that everything is actually
grounded.
most people that do live sound and lighting here in Vancouver Canada do
the same thing. You cant expect a venue to have enough outlets where you
need them but most Venues have tie in points of up to 400A 3phase.
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I did a gig a few years ago in Stratford, East London. Got to the venue to
find it was up several flights of stairs. We sat and waited for the promised
local crew for about 3 hours then finally got the stuff loaded in. Fairly
big rig with about 12 boxes of EV deltamax each side. This was the first
time I had used deltamax and I remembered the PA company owner telling me
something about inverting boxes and tweeters coupling so I set it all up
with all the tweeters together, changing it to every other box inverted once
my ears had stopped bleeding. We had a couple of 32 channel boards and some
Lab Gruppen amps, the old heavy ones.
Anyway, house electrician turned up, old black guy who looked like he had
just got out of bed but was still drunk. We asked him where the power was.
He pointed to two 13A sockets on the wall. After we had finished laughing he
then suggested a single 16A outlet. Eventually we managed to find the
distribution board and asked him to tie the lines from our distro into that.
Only problem was the board was locked and he didn't have the key. He asked
if he could borrow a screwdriver from my brand new toolkit and took the big
flathead. I was setting up my monitor board in the next room when I heard a
big bang, saw a bright flash and lots of cursing with a heavy west Indian
accent. The house electrician walked in to the room and looked literally
like something out of a comedy film. His hair was singed and up on end and
his face was a mess. Turned out he had levered the board open with my new
screwdriver and had shorted across two of the phases in the process. He
handed me back a plastic handle with a short bit of melted metal on the end
of it which was all that was left of my screwdriver, said "I'm going down
the pub" and left us to it.
In the end the gig was a complete nightmare and the local crew all got drunk
and went home before the end so we had to carry all the gear down the
stairs, just the two of us. Not a fun evening but the moral of the story is
always check the venue power before you book the gig and always carry your
own distro.
Phildo |
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