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<h3><small>James appears to be correct <br>
</small></h3>
<h3><small>Electricity Regulations 1997 (SR 1997/60) (as at 01 October
2008)</small></h3>
<dfn class="def-term" id="DLM228489" lang="en-NZ">extra-low voltage</dfn>
means any voltage normally not exceeding 50 volts a.c. or 120 volts
ripple-free d.c.<br>
<br>
The values might have changed when NZ decided to save money & adopt
the AS standards.<br>
My old copy of electrical standards dates from 1993 so no help.<br>
<br>
An important safety thing to consider with cabling is separation of
services.<br>
Any conductors in close proximity (50mm in 1993 ?) must have their
insulation rating raised to the highest voltage present.<br>
<br>
The only future proof cabling system is putting lengths of $10 ($4 to
sparkie) conduit in your walls when you have the chance, especially
walls that have insulation etc. There is no perfect or best cable
system.<br>
<br>
Cat5 & 6 are just cheap & easy to terminate.<br>
That is the sum total of all the pro's. But if it works it's good
enough.<br>
<br>
<br>
On 16/02/2010 7:04 p.m., James Gray wrote:
<blockquote
cite="mid:3fb9fda51002152204v2ccdd455tf0860a4097ec27ab@mail.gmail.com"
type="cite">
<pre wrap="">On Tue, Feb 16, 2010 at 6:51 PM, Jean-Yves Avenard <a class="moz-txt-link-rfc2396E" href="mailto:jyavenard@gmail.com"><jyavenard@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi
On 16 February 2010 16:34, James Gray <a class="moz-txt-link-rfc2396E" href="mailto:james6.0@gmail.com"><james6.0@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">To install anything with voltage greater than that considered to be
SELV (safe extra low voltage), you must be a registered electrician.
This is basically any time of signal or telecomms cabling (ELV in this
context, means anything lower than 100V AC, or 150V DC. 240V is
actually considered low voltage, compared to a 10,000V power line it
is anyway)
</pre>
</blockquote>
<pre wrap="">Hum..
Anything below 1000V AC and < 1500V DC is considered low voltage under
the AS/NZ cabling rule.
Knowing that a standard POTS is 50V DC and up to 90V AC ; that makes
it only a sparkie can work on telecomm cable according to your post
(don't know what the deal is in NZ)
</pre>
</blockquote>
<pre wrap="">
I am a Telecommunications technician. I work in New Zealand. I work
with telephone installations on a regular basis...
You actually have an interesting point there... Reading further into
it, Extra Low Voltage is defined as <120V DC or <50V AC... Hence a
ringing telephone line would be considered low voltage at 90V AC
In practice it's never been a problem. Telecom's PTC documents make
reference to the fact that many of their own linesmen (well, telecom's
chorus's transfield's/downer's lines people) are not registered
electricians, so phone jacks should not be installed within electrical
installations which require a registered electrician to work on..
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</pre>
</blockquote>
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