Protecting 100V amplifier terminals outut with residual current devices

Jun 11, 2012 13 Replies

Hello all. I'm designing a paging call sysytem with 4 500W class D amplifiers which output 100V audio to loudspeakers in a refinery. I have the amplifiers and the relative Controller Network unit installed in a



600 x 600 x 42 rack unit cabinet. I have the mains voltages output to a multisocket units which I have protected with residual current devices. I was wondering whether it is possible and how so to protect the 100V output from the amplifiers which goes to the loudspeakers within the refinery. By this I mean the terminals in both the cabinet and the relative connections on the loudspeakers. I mean just in case anyone touches the terminals ... to avoid/minimize possible electrical shocks. Regards.

Look for "Finger Safe" terminal blocks/strips.

Jamie

"Gerard"

** Is each 500W stage a bridged pair of amplifiers ?

If so, then the max AC voltage to ground is only 50 volts.

Not a shock hazard at all.

.... Phil

i did check on these and they seem to be a good protection against any shock hazards. I was reasoning on the possibility of getting an electric shock from the 100V and I reckon its close to impossible as the ground of the 100V is not the same as the ground a person would have his feet on ... so no risk at all of getting electrocuted. Similar to using an insulation transformer.

Gerard

Phil ... I think the shock risk is low for the reason I mentioned to my earlier message to jamie

Gerard

"Gerard" "Phil Allison"

Phil ... I think the shock risk is low for the reason I mentioned to my earlier message to jamie

** There is no such message visible here or on GG.

In any case pal - YOU came here to get ideas and info from experienced people.

Now, you refuse to answer a simple question and tell us YOUR ideas instead.

Piss off, bloody idiot.

... Phil

ced

d.

Phil ... Plz thats bollocks.

ced

d.

I meant there is some delay in message transmission. Gerard

Ignore Phil. He's off his medication, once again.

Place step down transformers at the terminus (speaker jack), so that the voltage is less, and no longer seen as a hazard.

PA systems do this so they will have less line loss on a long run.

If you have enclosed connections, and the transformer, the output terminals will /can be brought down to safer levels.

Also, that 100V is (should be) for a full amplitude signal, so the voltage on the line at idle should be pretty low.

Problem solved.

The other way is to SEAL the connections, even at the speaker, from human contact. Except for service personnel. The speakers shouldn't be simply rammed,crammed and jammed up into locations anyway, so your installs should be fairly formal to begin with.

I can't place step down transformers on the speaker terminals ... as the speakers are 100V speakers . They already have a transformer in them. The seling isn't a bad idea. gerard

"Chieftain of the Carpet Crawlers"

** ROTFLMAO !!!

So MORE more current = LESS losses !!!!

Georg Ohm will be rolling in his grave !!!!!!!!

... Phil

THere is a reason whey 100 Volt audio systems exist, and I don't think you understand it, properly.

Jamie

You're a goddamned idiot, and the entire groups understands that fact perfectly.

I was working on PA amplifiers when you were in diapers, punk.

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