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Monster Media 1994 #1
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1994-03-15
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49KB
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801 lines
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αâ─ v⌠VΦ2â─└uΘi 6`# 6^# v⌠VÜ╠Fαâ─└uΘN 6p# 6n# v⌠ v≥Ü╠Fαâ─└tΘ■╕Θ╩ï~εÄΓ9&─X& ╖Ω& ╖Φ╕e%PïF≡PWï≡Üααâ─ï╞ï≈ëF■ëvⁿΘàÉ2└P░PÜ╢] â─ÄΓ9&─X&ïçá&ïùóï°ëV■δ\2└P░PÜ╢] â─Ä
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■+└&ëG&ëë╛n Ä┌9&9ptHÄ▄9&9vt=╕PPÄ▐9& 6û& 6öÜ`┘â─╕æ%PÄ▐9& 6û& 6öÜZ┘â─ÜT┘δ╕╡%PÜ|α â─╗TÄ:ë₧■îå■&╟╕╨PÜ╒ â─ëF∞ëVε╕pPÜ╒ â─ëF≡ëV≥+└ëF÷ëF⌠èå{ ■å{ <vΘvâ~uZ 6`# 6^#╕└%P ╢~ VÜααâ─╕P ╢~ VÜ"αâ─P ╢~ VÜJ] neat a job as possible. Don't cut corners.
Exceed specifications. Otherwise, the inspector may get extremely
picky and fault you on the slightest transgressions.
Don't try to hide anything from the inspector.
Use the proper tools. Ie: don't use a bread knife to strip
wires, or twist wires with your fingers. The inspector
won't like it, and the results won't be that safe. And it
takes longer. And you're more likely to stick a hunk of
12ga wire through your hand that way.
Don't handle house wire when it's very cold (eg: below -10C
or 16F). Thermoplastic house wire, particularly older types
become very brittle.
Subject: What do I need in the way of tools?
First, there's the obvious -- a hammer, a drill, a few
screwdrivers, both straight and Phillips-head. If you're
lucky enough to live in Canada (or find a source of CSA-approved
devices) you need Robertson ("square recess") screwdrivers
(#1 and #2) instead of phillips.
For drilling a few holes, a 3/4" or 1" spade bit and 1/4" or
3/8" electric drill will do. If you're doing a lot, or
are working with elderly lumber, we recommend a 1/2" drill
(right-angle drills are wonderful. Can be rented) and
3/4" or 1" screw-point auger drill bits. These bits pull
you through, so they're much faster and less fatiguing, even
in 90 year old hardwood timbers.
Screw-driver bits are useful for drills, expecially if you
install your electrical boxes using screws (drywall screws
work well).
For stripping wire, use a real wire stripper, not a knife or
ordinary wire cutters. Don't buy the $3 K-mart "combo stripper,
crimper and bottle opener" types. You should expect to pay
$15 to $20 for a good "plier-type" pair. It will have sized
stripping holes, and won't nick or grab the wire - it should
be easy to strip wire with it. One model has a small hole in the
blade for forming exact wire loops for screw terminals. There
are fancier types (autostrip/cut), but they generally aren't
necessary, and pros usually don't use them.
A pair of diagonal side cutter pliers are useful for clipping ends
in constricted places. Don't use these for stripping wire.
You will need linesman pliers for twisting wires for wire nuts.
You should have a pair of needle-nose pliers for fiddling
inside boxes and closing loops, but it's better to form wire
loops with a "loop former hole" on your wire stripper - more
accurate.
If you're using non-metallic cable, get a cable stripper for
removing the sheath. Or, do what some pros do, they nick the
end of the sheath, grab the ground wire with a pair of pliers,
and simply rip the sheath back using the ground wire as a
"zipper", and cut the sheath off. You shouldn't try to strip
the sheath with a knife point, because it's too easy to
slash the insulation on the conductors. Apparently Stanley
utility knives fitted with linoleum cutters (hooked blades)
can be used to strip sheath, but there is still the possibility
that you'll gouge the conductors.
For any substantial amount of work with armored cable, it's well
worth your while to invest in a rotary cable splitter (~US$ 18).
Hack saws are tricky to use without cutting into the wire
or the insulation.
Three-prong outlet testers are a quick check for properly-wired
outlets. About $6. Multimeters tell you more, but are a lot more
expensive, and probably not worth it for most people. A simple
voltage sensor, which can detect potential through an insulated
wire not supplying any devices, is extremely helpful; they cost
about US$ 10 at Radio Shack.
You should have a voltage detector - to check that the wires are
dead before doing work on them. Neon-bulb version are cheap ($2-3)
and work well. If you get more serious, a "audible alarm" type is
good for tracing circuits without a helper. (Though I've been known
to lock the drill on, and hit breakers until the scream stops ;-)
For running wires through existing walls, you need fish tape.
Often, two tapes are needed, though sometimes, a bent hanger or
a length of thin chain will suffice. Fish tapes can be rented.
Electrical tape. Lots of it ;-) Seriously, a good and competent
wiring job will need very little tape. The tape is useful for
wrapping dicy insulation in repair work. Another use is to wrap
around the body of outlets and switches to cover the termination
screws - I don't do this, but drywall contractors prefer it (to
prevent explosions when the drywall knife collides with a live outlet
that has no cover plate).
Subject: What is UL listing?
The UL stands for "Underwriters Laboratory". It used to be
an Insurance Industry organization, but now it is independent
and non-profit. It tests electrical components and equipment
for potential hazards. When something is UL-listed, that means
that the UL has tested the device, and it meets their requirements
for safety - ie: fire or shock hazard. It doesn't necessarily
mean that the device actually does what it's supposed to, just
that it probably won't kill you.
The UL does not have power of law in the U.S. -- you are
permitted to buy and install non-UL-listed devices. However,
insurance policies sometimes have clauses in them that will
limit their liability in case of a claim made in response to
the failure of a non-UL-listed device. Furthermore, in
many situations the NEC will require that a wiring component
used for a specific purpose is UL-listed for that purpose.
Indirectly, this means that certain parts of your wiring
must be UL-listed before an inspector will approve it and/or
occupancy permits issued.
Subject: What is CSA approval?
Every electrical device or component must be certified by the
Canadian Standards Association before it can be sold in
Canada. Implicit in this is that all wiring must be done
with CSA-approved materials. They perform testing similar to
the UL (a bit more stringent), except that CSA approval is
required by law.
Again, like the UL, if a fire was caused by non-CSA-approved
equipment, your insurance company may not have to pay the
claim.
Note: strictly speaking, there usually is a legal way around the
lack of a CSA sticker. In some cases (eg: Ontario), a local hydro
inspection prior to purchase, or prior to use, is acceptable.
The hydro inspector will affix a "hydro sticker" to the unit, which
is as good as CSA approval. But it costs money - last I knew,
$75 per unit inspected.
ULC (Underwriters Laboratory of Canacense. Nor are you permitted to do
wiring in "commercial" buildings. Multiple dwellings (eg: duplexes)
are usually considered "semi-commercial" or "commercial". However,
many jurisdictions will permit you to work on semi-commercial
wiring if you're supervised by a licensed electrician - if you can
find one willing to supervise.
If you do your own wiring, an important point:
Do it NEAT and WELL! What you really want to aim for is a better
job than an electrician will do. After all, it's your own home,
and it's you or your family that might get killed if you make
a mistake. An electrician has time pressures, has the skills
and knows the tricks of the trade to do a fast, safe job.
In this FAQ we've consciously given a few recommendations that
are in excess of code, because we feel that it's reasonable,
and will impress the inspector.
The inspector will know that you're an amateur. You have to
earn his trust. The best way of doing this is to spend your
time doing asused for most circuits supplying receptacles and
lighting within your house. (3) is usually used for supplying
power to major appliances such as stoves, and dryers - they
often have need for both 220V and 110V, or for bringing several
circuits from the panel box to a distribution point. (2) is
usually for special 220V motor circuits, electric heaters, or
air conditioners.
[Note: In the US, the NEC frequently permits a circuit similar
to (2) be used for stoves and dryers - namely, that there
are two hot wires, and a wire that does dual duty as neutral
and ground, and is connected to the frame as well as providing
the neutral for 110V purposes - three prong plugs instead
of four (*only* for stoves/dryers connected to the main panel.
When connected to most sub-panels, 4 prong plugs and receptacles
are required). In our not-so-humble opinion this is crazy, but
the NFPA claims that this practice was re-evaluated for the 1992 NEC,
and found to be safe. Check your local codes, or inquire as to
local practice -- there are restrictions on when this is
permissible.]
(1) is usually wired with three conductor wire: black for hot,
white for neutral, and bare for grounding.
(2) and (3) have one hot wire coloured red, the other black, a
bare wire for grounding, and in (3) a white wire for neutral.
You will sometimes see (2) wired with just a black, white and ground
wire. Since the white is "hot" in this case, both the NEC and CEC
requires that the white wire be "permanently marked" at the ends
to indicate that it is a live wire. Usually done with paint, nail
polish or sometimes electrical tape.
Each circuit is attached to the main wires coming into the
panel through a circuit breaker or fuse.
There are, in a few locales, circuits that look like (1), (2)
or (3) except that they have two bare ground wires. Some places
require this for hot tubs and the like (one ground is "frame ground",
the other attaches to the motor). This may or may not be an
alternative to GFCI protection.
Subject: "grounding" versus "grounded" versus "neutral".
According to the terminology in the CEC and NEC, the
"grounding" conductor is for the safety ground, i.e., the green
or bare or green with a yellow stripe wire. The word "neutral"
is reserved for the white when you have a circuit with more than
one "hot" wire. Since the white wire is connected to neutral and
the grounding conductor inside the panel, the proper term is
"grounded conductor". However, the potential confusion between
"grounded conductor" and "grounding conductor" can lead to
potentially lethal mistakes - you should never use the bare wire
as a "grounded conductor" or white wire as the "grounding conductor",
even though they are connected together in the panel.
[But not in subpanels - subpanels are fed neutral and ground
separately from the main panel. Usually.]
Note: do not tape, colour or substitute other colour wires for the
safety grounding conductor.
In the trade, and in common usage, the word "neutral" is used
for "grounded conductor". This FAQ uses "neutral" simply to
avoid potential confusion. We recommend that you use "neutral"
too. Thus the white wire is always (except in some light
switch applications) neutral. Not ground.
Subject: What does a fuse or breaker do? What are the differences?
Fuses and circuit breakers are designed to interrupt the power
to a circuit when the current flow exceeds safe levels. For
example, if your toaster shorts out, a fuse or breaker should
"trip", protecting the wiring in the walls from melting. As
such, fuses and breakers are primarily intended to protect the
wiring -- UL or CSA approval supposedly indicates that the
equipment itself won't cause a fire.
Fuses contain a narrow strip of metal which is designed to melt
(safely) when the current exceeds the rated value, thereby
interrupting the power to the circuit. Fuses trip relatively
fast. Which can sometimes be a problem with motors which have
large startup current surges. For motor circuits, you can use
a "time-delay" fuse (one brand is "fusetron") which will avoid
tripping on momentary overloads. A fusetron looks like a
spring-loaded fuse. A fuse can only trip once, then it must be
replaced.
Breakers are fairly complicated mechanical devices. They
usually consist of one spring loaded contact which is latched
into position against another contact. When the current flow
through the device exceeds the rated value, a bimetallic strip
heats up and bends. By bending it "trips" the latch, and the
spring pulls the contacts apart. Circuit breakers behave
similarly to fusetrons - that is, they tend to take longer to
trip at moderate overloads than ordinary fuses. With high
overloads, they trip quickly. Breakers can be reset a finite
number of times - each time they trip, or are thrown
when the circuit is in use, some arcing takes place, which
damages the contacts. Thus, breakers should not be used in
place of switches unless they are specially listed for the
purpose.
Neither fuses nor breakers "limit" the current per se. A dead
short on a circuit can cause hundreds or sometimes even
thousands of amperes to flow for a short period of time, which
can often cause severe damage.
Subject: Breakers? Can't I use fuses?
Statistics show that fuse panels have a significantly higher
risk of causing a fire than breaker panels. This is usually
due to the fuse being loosely screwed in, or the contacts
corroding and heating up over time, or the wrong size fuse
being installed, or the proverbial "replace the fuse with a
penny" trick.
Since breakers are more permanently installed, and have better
connection mechanisms, the risk of fire is considerably less.
Fuses are prone to explode under extremely high overload. When
a fuse explodes, the metallic vapor cloud becomes a conducting
path. Result? From complete meltdown of the electrical panel,
melted service wiring, through fires in the electrical
distribution transformer and having your house burn down.
[This author has seen it happen.] Breakers won't do this.
Many jurisdictions, particularly in Canada, no longer permit
fuse panels in new installations. The NEC does permit new
fuse panels in some rare circumstances (requiring the special
inserts to "key" the fuseholder to specific size fuses)
Some devices, notably certain large air conditioners, require fuse
protection in addition to the breaker at the panel. The fuse
is there to protect the motor windings from overload. Check the
labeling on the unit. This is usually only on large permanently
installed motors. The installation instructions will tell you
if you need one.
Subject: What size wire should I use?
For a 20 amp circuit, use 12 gauge wire. For a 15 amp circuit,
you can use 14 gauge wire (in most locales). For a long run,
though, you should use the next larger size wire, to avoid
voltage drops. 12 gauge is only slightly more expensive than
14 gauge, though it's stiffer and harder to work with.
Here's a quick table for normal situations. Go up a size for
more than 100 foot runs, when the cable is in conduit, or
ganged with other wires in a place where they can't dissipate
heat easily:
Gauge Amps
14 15
12 20
10 30
8 40
6 65
We don't list bigger sizes because it starts getting very dependent
on the application and precise wire type.
Subject: Where do these numbers come from?
There are two considerations, voltage drop and heat buildup.
The smaller the wire is, the higher the resistance is. When
the resistance is higher, the wire heats up more, and there is
more voltage drop in the wiring. The former is why you need
higher-temperature insulation and/or bigger wires for use in
conduit; the latter is why you should use larger wire for long
runs.
Neither effect is very significant over very short distances.
There are some very specific exceptions, where use of smaller
wire is allowed. The obvious one is the line cord on most
lamps. Don't try this unless you're certain that your use fits
one of those exceptions; you can never go wrong by using larger
wire.
Subject: What does "14-2" mean?
This is used to describe the size and quantity of conductors
in a cable. The first number specifies the gauge. The second
the number of current carrying conductors in the wire - but
remember there's usually an extra ground wire. "14-2" means
14 gauge, two insulated current carrying wires, plus bare ground.
-2 wire usually has a black, white and bare ground wire. Sometimes
the white is red instead for 220V circuits without neutral. In
the latter case, the sheath is usually red too.
-3 wire usually has a black, red, white and bare ground wire.
Usually carrying 220V with neutral.
Subject: What is a "wirenut"/"marrette"/"marr connector"? How are they
used?
A wire nut is a cone shaped threaded plastic thingummy that's used
to connect wires together. "Marrette" or "Marr connector"
are trade names. You'll usually use a lot of them in DIY wiring.
In essence, you strip the end of the wires about an inch, twist them
together, then twist the wirenut on.
Though some wirenuts advertise that you don't need to twist the
wire, do it anyways - it's more mechanically and electrically
secure.
There are many different sizes of wire nut. You should check
that the wire nut you're using is the correct size for the
quantity and sizes of wire you're connecting together.
Don't just gimble the wires together with a pair of pliers or
your fingers. Use a pair of blunt nose ("linesman") pliers,
and carefully twist the wires tightly and neatly. Sometimes
it's a good idea to trim the resulting end to make sure it
goes in the wirenut properly.
Some people wrap the "open" end of the wirenut with electrical
tape. This is probably not a good idea - the inspector may
tear it off during an inspection. It's usually done because
a bit of bare wire is exposed outside the wire nut - instead
of taping it, the connection should be redone.
Subject: What is a GFI/GFCI?
A GFCI is a ``ground-fault circuit interrupter''. It measures
the current current flowing through the hot wire and the
neutral wire. If they differ by more than a few milliamps, the
presumption is that current is leaking to ground via some other
path. This may be because of a short circuit to the chassis of
an appliance, or to the ground lead, or through a person. Any
of these situations is hazardous, so the GFCI trips, breaking
the circuit.
GFCIs do not protect against all kinds of electric shocks. If,
for example, you simultaneously touched the hot and neutral
leads of a circuit, and no part of you was grounded, a GFCI
wouldn't help. All of the current that passed from the hot
lead into you would return via the neutral lead, keeping the
GFCI happy.
The two pairs of connections on a GFCI outlet are not symmetric.
One is labeled LOAD; the other, LINE. The incoming power feed
*must* be connected to the LINE side, or the outlet will not be
protected. The LOAD side can be used to protect all devices
downstream from it. Thus, a whole string of outlets can be
covered by a single GFCI outlet.
Subject: Where should GFCIs be used?
The NEC mandates GFCIs for 110V, 15A or 20A single phase
outlets, in bathrooms, kitchens within 6' of the sink, wet-bar
sinks, roof outlets, garages, unfinished basements or crawl spaces,
outdoors, near a pool, or just about anywhere else where you're likely
to encounter water or dampness. There are exceptions for inaccessible
outlets, those dedicated to appliances ``occupying fixed space'',
typically refrigerators and freezers, and for sump pumps and
laundry appliances.
The NEC now requires that if your replace an outlet in a
location now requiring GFCI, you must install GFCI protection.
Note in particular - kitchen and bathroom outlets.
When using the "fixed appliance" rule for avoiding GFCI outlets,
single outlet receptacles must be used for single appliances,
duplex receptacles may be used for two appliances.
The CEC does not mandate as many GFCIs. In particular, there
is no requirement to protect kitchen outlets, or most garage or
basement outlets. Basement outlets must be protected if you
have a dirt floor, garage outlets if they're near the door to
outside. Bathrooms and most exterior outlets must have GFCIs,
as do pools systems and jacuzzi or whirlpool pumps.
There are many rules about GFCIs with pools and so on. This
is outside of our expertise, so we're not covering it in
detail. See your inspector.
When replacing an outlet, it must now be GFCI-protected if
such would now be required for a new installation. That is,
a kitchen outlet installed per the 1984 code need not have
been protected, but if that outlet is ever replaced, GFCI
protection must now be added (under NEC). This is explicit
in the 1993 NEC, and inspector-imposed in Canada.
Even if you are not required to have GFCI protection, you may
want to consider installing it anyway. Unless you need a GFCI
breaker (see below), the cost is low. In the U.S., GFCI
outlets can cost as little as US$8. (Costs are a bit higher in
Canada: C$12.) Evaluate your own risk factors. Does your
finished basement ever get wet? Do you have small children?
Do you use your garage outlets to power outdoor tools? Does
water or melted snow ever puddle inside your garage?
Subject: Where shouldn't I use a GFCI?
GFCIs are generally not used on circuits that (a) don't pose a
safety risk, and (b) are used to power equipment that must run
unattended for long periods of time. Refrigerators, freezers,
and sump pumps are good examples. The rationale is that GFCIs
are sometimes prone to nuisance trips. Some people claim that
the inductive delay in motor windings can cause a momentary
current imbalance, tripping the GFCI. Note, though, that most
GFCI trips are real; if you're getting a lot of trips for no
apparent reason, you'd be well-advised to check your wiring
before deciding that the GFCI is broken or useless.
Subject: What is the difference between a GFCI outlet and a GFCI breaker?
For most situations, you can use either a GFCI outlet as the
first device on the circuit, or you can install a breaker with
a built-in GFCI. The former is generally preferred, since GFCI
breakers are quite expensive. For example, an ordinary GE
breaker costs ~US$5; the GFCI model costs ~US$35. There is one
major exception: if you need to protect a ``multi-wire branch
circuit'' (two or more circuits sharing a common neutral wire),
such as a Canadian-style kitchen circuit, you'll need a
multi-pole GFCI breaker. Unfortunately, these are expensive;
the cost can range into the hundreds of dollars, depending on
what brand of panel box you have. But if you must protect such
a circuit (say, for a pool heater), you have no choice.
One more caveat -- GFCI outlets are bulky. You may want to use
an oversize box when installing them. On second thought, use
large (actually deep) boxes everywhere. You'll thank yourself
for it.
Incidentally, if you're installing a GFCI to ensure that one
specific outlet is protected (such as a bathroom), you don't
really have to go to all of the trouble to find the first
outlet in the circuit, you could simply find the first outlet
in the bathroom, and not GFCI anything upstream of it. But
protecting the whole circuit is preferred.
When you install a GFCI, it's a good idea to use the little
"ground fault protected" stickers that come with it and mark
the outlets downstream of the GFCI. You can figure out which
outlets are "downstream", simply by tripping the GFCI with the
test button and see which outlets are dead.
Note that the labels are mandatory for GFCI-protected-but-ungrounded
three prong outlets according to the NEC.
Subject: What's the purpose of the ground prong on an outlet, then?
Apart from their use in electronics, which we won't comment on,
and for certain fluorescent lights (they won't turn on without
a good ground connection), they're intended to guard against
insulation failures within the device. Generally, the case of
the appliance is connected to the ground lead. If there's an
insulation failure that shorts the hot lead to the case, the
ground lead conducts the electricity away safely (and possibly
trips the circuit breaker in the process). If the case is not
grounded and such a short occurs, the case is live -- and if
you touch it while you're grounded, you'll get zapped. Of
course, if the circuit is GFCI-protected, it will be a very
tiny zap -- which is why you can use GFCIs to replace
ungrounded outlets (both NEC and CEC).
There are some appliances that should *never* be grounded. In
particular, that applies to toasters and anything else with
exposed conductors. Consider: if you touch the heating
electrode in a toaster, and you're not grounded, nothing will
happen. If you're slightly grounded, you'll get a small shock;
the resistance will be too high. But if the case were
grounded, and you were holding it, you'd be the perfect path to
ground...
Subject: Why is one prong wider than the other? Polarization
Nowadays, many two-prong devices have one prong wider than the
other. This is so that the device could rely (not guaranteed!)
on one specific wire being neutral, and the other hot.
This is particularly advantageous in light fixtures, where the
the shell should neutral (safety), or other devices which want to
have an approximate ground reference (ie: some radios).
Most 2-prong extension cords have wide prongs too.
This requires that you wire your outlets and plugs the right
way around. You want the wide prong to be neutral, and the
narrow one hot. Most outlets have a darker metal for the
hot screw, and lighter coloured screw for the neutral.
If not, you can usually figure out which is which by which
prong the terminating screw connects to.
Subject: How do I convert two prong receptacles to three prong?
Older homes frequently have two-prong receptacles instead
of the more modern three. These receptacles have no safety
ground, and the cabling usually has no ground wire. Neither
the NEC or CEC permits installing new 2 prong receptacles anymore.
There are several different approaches to solving this:
1) If the wiring is done through conduit or BX, and the
conduit is continuous back to the panel, you can connect
the third prong of a new receptacle to the receptacle
box. NEC mainly - CEC frowns on this practice.
2) If there is a copper cold water pipe going nearby, and
it's continuous to the main house ground point, you can
run a conductor to it from the third prong.
NEC: this can only be done if the point of attachment
is within 5 feet of where the pipe enters the ground.
3) Run a ground conductor back to the main panel.
4) Easiest: install a GFCI receptacle. The ground lug
should not be connected to anything, but the GFCI
protection itself will serve instead. The GFCI
will also protect downstream (possibly also two prong
outlets). If you do this to protect downstream outlets,
the grounds must not be connected together. Since it
wouldn't be connected to a real ground, a wiring fault
could energize the cases of 3 prong devices connected
to other outlets. Be sure, though, that there aren't
indirect ground plug connections, such as via the sheath
on BX cable.
The CEC permits you to replace a two prong receptacle with a three
prong if you fill the U ground with a non-conducting goop.
Like caulking compound. This is not permitted in the NEC.
The NEC requires that three prong receptacles without ground
that are protected by GFCI must be labelled as such.
See the next section about computers on GFCI-protected groundless
outlets.
Subject: Surges, spikes, zaps, grounding and your electronics (NEW)
Theoretically, the power coming into your house is a perfect
AC sine wave. It is usually quite close. But occasionally,
it won't be. Lightning strikes and other events will affect
the power. These usually fall into two general categories: very
high voltage spikes (often into 1000s of volts, but usually
only a few microseconds in length) or surges (longer duration,
but usually much lower voltage).
Most of your electrical equipment, motors, transformer-operated
electronics, lights, etc., won't even notice these one-shot events.
However, certain types of solid-state electronics, particularly
computers with switching power supplies and MOS semiconductors,
can be damaged by these occurances. For example, a spike can
"punch a hole" through an insulating layer in a MOS device (such
as that several hundred dollar 386 CPU), thereby destroying it.
The traditional approach to protecting your electronics is to use
"surge suppressors" or "line filters". These are usually devices
that you plug in between the outlet and your electronics.
Roughly speaking, surge suppressors work by detecting overvoltages,
and shorting them out. Think of them as voltage limiters. Line
filters usually use frequency-dependent circuits (inductors, capacitors
etc.) to "tune out" undesirable spikes - preventing them from reaching
your electronics.
So, you should consider using suppressors or filters on your sensitive
equipment.
These devices come in a very wide price range. From a couple
of dollars to several hundred. We believe that you can protect
your equipment from the vast majority of power problems by selecting
devices in the $20-50 range.
A word about grounding: most suppressors and EFI filters require real
grounds. Any that don't are next to useless.
For example, most surge suppressors use MOVs (metal oxide varistors)
to "clamp" overvoltages. Yes, you can have a suppressor that only
has a MOV between neutral and hot to combat differential-mode voltage
excursions, but that isn't enough. You need common-mode protection
too. Good suppressors should have 3 MOVs, one between each pair of wires.
Which means you should have a good solid ground. Eg: a solidly connected
14ga wire back to the panel. Not rusty BX armour or galvanized pipe
with condensation turning the copper connection green.
Without a ground, a surge or spike is free to "lift" your entire electronics
system well away from ground. Which is ideal for blowing out interface
electronics for printer ports etc.
Secondly, static electricity is one of the major enemies of electronics.
Having good frame grounds is one way of protecting against static zaps.
If you're in the situation of wanting to install computer equipment
on two wire groundless circuits take note:
Adding a GFCI outlet to the circuit makes the circuit safe for you.
But it doesn't make it safe for your equipment - you need a ground to
make surge suppressors or line filters effective.
Subject: Are you sure about GFCIs and ungrounded outlets?
Should the test button work?
The NEC, section 210-7(d), and CEC, section 26-700(9), are quite
explicit that GFCIs are a legal substitute for a grounded outlet
in an existing installation where there is no ground available in
the outlet box.
But your local codes may vary. As for the TEST button -- there's
a resistor connecting the LOAD side of the hot wire to the LINE
side of the neutral wire when you press the TEST button. Current
through this resistor shows up as an imbalance, and trips the GFCI.
This is a simple, passive, and reliable test, and doesn't require
a real ground to work. If your GFCI does not trip when you press
the TEST button, it is very probably defective or miswired. Again:
if the test button doesn't work, something's broken, and potentially
dangerous. The problem should be corrected immediately.
The instructions that come with some GFCIs specify that the ground
wire must be connected. We do not know why they say this. The
causes may be as mundane as an old instruction sheet, or with the
formalities of UL or CSA listing -- perhaps the device was never
tested without the ground wire being connected. On the other hand,
UL or CSA approval should only have been granted if the device
behaves properly in *all* listed applications, including ungrounded
outlet replacement. (One of us called Leviton; their GFCIs are
labeled for installation on grounded circuits only. The technician
was surprised to see that; he agreed that the NEC does not require
it, and promised to investigate.)