16,841 reputation
13986
bio website gregmaclellan.com
location Canada
age 33
visits member for 4 years
seen 10 hours ago

Professional software developer, with several years working on industrial control and monitoring systems. Slowly remodeling parts of my house.


Dec
14
revised Is it possible to be electrocuted from a properly functioning GFCI circuit?
added 33 characters in body
Dec
14
comment Is it possible to be electrocuted from a properly functioning GFCI circuit?
GFCI's also protect against faults in the appliance - think a fridge, or power tool, where the chassis is grounded. If there is a short inside the appliance that connects the hot to the chassis, a GFCI will trip and shut off the power. Without a GFCI, the chassis will still be electrified but at least connected to ground, and likely enough current will flow that the circuit breaker will trip (but as Jeff says, a circuit breaker doesn't act as quickly as a GFCI). If there is no ground, when you touch the chassis YOU will form the path to ground and will be seriously electrocuted.
Dec
14
revised Is it possible to be electrocuted from a properly functioning GFCI circuit?
expand on several points
Dec
14
revised What's the difference between dimmable and non-dimmable LED lamps?
typo
Dec
13
comment What material should be used behind a sink and range in the kitchen?
Do you mean behind the base cabinets, or just above the counter? Are you going to be tiling or putting some type of backsplash up? Is there a specific reason you don't want to use drywall?
Dec
12
comment How to measure a crooked room?
What material are the plates made of? Is there some reason that they can't be cut onsite? I'm in agreement with @shirlock here, pre-measuring/cutting is really difficult when the room is built perfectly; it's impossible if it's not true.
Dec
12
comment How to hang a baby cradle from a concrete ceiling?
How about buying a cradle that is designed to just sit on the floor?
Dec
12
comment Does wardrobe/closet need doors?
Note: UV in this way can come from direct sunlight, to a much lesser extent reflected sunlight (off a mirror, or even wall), and from some florescent bulbs. In other words, this consideration is much more important in a closet that gets direct sunlight during the day and not all that important in a dark-painted room with a north-facing window and incandescent lighting. +1 though, I can't think of any other non-aesthetic reason for closet doors.
Dec
12
comment Can I install carpet in the attic?
One thing to consider is that if there is ever somehow carpet but no subfloor underneath, someone/thing may fall through the roof. This would only be a problem if the carpet and/or subfloor can move independently, and there is some area of the attic that you're not putting subfloor on.
Dec
12
comment How to deal with abandoned wire?
If you are going to cut it off, it's a good idea to short out the wire -- connect white and black with a wire nut -- so that if someone ever does mistakenly hook it up, it blows the breaker. This is much better than having live power on a wire that goes nowhere.
Dec
9
answered What is the difference between R20 and PAR20 lightbulbs?
Dec
9
comment How do I control a heat lamp with a thermostat?
You qualify a solution that uses a microcontroller and a half-dozen other parts and requires writing code as just a "bit more complex"?? :)
Dec
9
comment How do I control a heat lamp with a thermostat?
Even a link to the thermostat you're using would help.
Dec
8
comment How can I mount an LCD TV onto the *wall* of an RV?
Interior or exterior wall?
Dec
6
revised Can I reroute this air duct?
added 239 characters in body
Dec
6
revised What steps should I take to figure out which alarm model I have and how to go about installing a missing sensor?
added 368 characters in body
Dec
6
answered Can I reroute this air duct?
Dec
6
answered What steps should I take to figure out which alarm model I have and how to go about installing a missing sensor?
Dec
4
comment Line tester reads power to 220V outlet when the breaker is off
Voltage back-feed is still voltage. There are still 220V on that line, if that's what your meter is showing you. The difference is that it's a very small current, and not enough to turn on the Knopp tester you showed. This also MAY mean that it won't injure you (current is what kills you, not voltage), but unless you're willing to risk your life to do a little electrical work, I'd recommend finding out what you need to shut off to get your meter to read 0 before touching anything potentially live. Use a non-contact testor, and check every time before you touch anything that may be electrified.
Dec
4
answered Line tester reads power to 220V outlet when the breaker is off