Re: CO2 Placement

["Petem" <petem001@xxxxxxxxx>]

"Frank Olson" <Use-the-email-links@xxxxxxxxxxxxxxxxxxxxxx> a écrit dans le
message de news: 3JsHh.1260421$R63.877594@xxxxxxxxxxxx
> Jim wrote:
>
>> I think if everyone would simply read all of the opinions that have
>> been posted in this sage group in the past, regarding the placement of
>> CO detectors and taking a consensus of all those opinions, it would be
>> quite clear to anyone with any intelligence at all  ...... that it was
>> ok to mount a CO detector anywhere. As long as the main panel had and
>> earth ground ..... ummmm .... or didn't.
>>
>
> Please remember to ground your plastic back boxes too.

like in this faq...

http://www.faqs.org/faqs/electrical-wiring/part2/

a little part of it....Subject: Should I use plastic or metal boxes?

	The NEC permits use of plastic boxes with non-metallic cable
	only.  The reasoning is simple -- with armoured cable, the box
	itself provides ground conductor continuity.  U.S. plastic
	boxes don't use metal cable clamps.

	The CEC is slightly different.  The CEC never permits cable
	armour as a grounding conductor.  However, you must still
	provide ground continuity for metallic sheath.  The CEC also
	requires grounding of any metal cable clamps on plastic boxes.

	The advantage of plastic boxes is comparatively minor even for
	non-metallic sheathed cable -- you can avoid making one ground
	connection and they sometimes cost a little less.  On the other
	hand, plastic boxes are more vulnerable to impacts.  For
	exposed or shop wiring, metal boxes are probably better.

	Metal receptacle covers must be grounded, even on plastic
	boxes.  This may be achieved by use of a switch with ground
	connection.