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Registered Member #124
Joined: Fri Feb 10 2006, 01:30PM
Location: Portland Oregon
Posts: 35
Can anyone in OZ give me the legal definition (per SA 3000 or similar) of "ripple-free?" The phrase gets used a lot, but I've been unable to locate legal tolerances. Sureley they don't mean 0.000000000000000% do they?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
You need to contact your governing authority to find out the exact definition of ripple free. It will vary by authority and what may be deemed as ripple free acceptible, say here in the US, may not be for the SAA.
Registered Member #124
Joined: Fri Feb 10 2006, 01:30PM
Location: Portland Oregon
Posts: 35
My govenrning authority doesn't care about the SAA. My governing authority does not use the phrase "ripple free." Shoot, half of those old codgers could barely find Australia on a map. That's why I'm asking the folks from OZ.
Here's why I'm asking... The NEC used to specify that free-air low-voltage wiring be supported at intervals not exceeding six feet (1.8m). Then the NFPA re-wrote almost all of the low-voltage rules. There is currently NO NEC requirement for minimum interval of support for free-air low-voltage wiring - but the code still specifies that the (now nonexistant) minimum interval not be exceeded. This, coupled with BICSE specification and some state's rules for a five foot (1.5m) interval and frequent custom of a four foot (1.2m) interval, has lead to many rumors of what the acceptable interval is. Some folk actually support every three feet (.9)m "just in case." The issue is unresolved in Oregon.
So... when the SAA definitions of "low voltage" and "high voltage" came up, and no one could find a definition of "ripple free," I started to wonder if a discrepancy of similar nature had occurred with the Australian agency.
One Australian document dealing with farm animal deaths uses 10% as the maximum ripple for "ripple free." Another document dealing with some kind of medical application cites "two volts" (without mentioning peak, p-p, or rms).
There are clever Australians who frequent this forum, and one of them may well have run into this and know something.
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[moved] Australian SAA wiring rule definitions?
