TP912 datasheet(8/72 Pages) ETC1

Teilenummer	TP912

Bauteilbeschribung	Test Tools Catalog Volume one, 2007

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8

Safety

Safety and You

Why is safety important?

Why should you care?

Between five and ten times on any given

day, arc flash explosions, sufficient to send

a victim to a special burn center, take place

in the U.S. These incidents and other less

serious electrical accidents result in injury

—sometimes death—lost work time, medical

costs and insurance claims, downtime, the

list goes on.

The cost to both the victim, the victim’s

family and the company involved, are

high. Yet many of these accidents can be

prevented. The combination of training,

good measurement technique, and the use

of proper tools can significantly reduce the

chance of an accident occurring.

What are the Standards?

To provide improved protection for users,

industry standards organizations have

taken steps to clarify the hazards present

in electrical supply environments. The

American National Standards Institute

(ANSI), the Canadian Standards Association

(CSA), and the International Electro-

Technical Commission (IEC), have created

more stringent standards for voltage test

equipment used in environments of up to 1000 volts.

ANSI, CSA and IEC define four measurement categories of over-voltage transient

impulses. The rule of thumb is that the closer the technician is working to the power

source, the greater the danger and the higher the measurement category number. Lower

category installations usually have greater impedance, which dampens transients and

helps limit the fault current that can feed an arc.

• CAT (Category) IV is associated

with the origin of installation.

This refers to power lines at

the utility connection, but also

includes any overhead and

underground outside cable runs,

since both may be affected by

lightning.

• CAT III covers distribution level

wiring. This includes 480-volt

and 600-volt circuits such as

3-phase bus and feeder circuits,

motor control centers, load

centers and distribution panels.

Permanently installed loads are

also classed as CAT III. CAT III

includes large loads that can

generate their own transients. At this level, the trend to using higher voltage levels in

modern buildings has changed the picture and increased the potential hazards.

• CAT II covers the receptacle circuit level and plug-in loads.

• CAT I refers to protected electronic circuits.

Some installed equipment may include multiple categories. A motor drive panel, for

example, may be CAT III on the 480-volt power side, and CAT I on the control side.

Independent testing labs help ensure safety compliance

You want your tools and equipment to help you work safely. But how do you know that

a tool designed to meet a safety standard will actually deliver the performance you are

paying for?

Unfortunately it’s not enough to just look on the box. The IEC (International

Electrotechnical Commission) develops and proposes standards, but it is not responsible

for enforcing the standards. Wording like “Designed to meet specification...” may not mean

a test tool actually performs up to spec. Designer’s plans are never a substitute for an

actual independent test.

TUV and VDE

(German standards

organizations) are

approval/listing

agencies

Canadian Standards

Association (CSA)

For more information, go to www.fluke.com/safety

That’s why independent testing is

so important. To be confident, check

the product for the symbol and listing

number of Underwriters Laboratories

(UL), the Canadian Standards Associa-

tion (CSA), TÜV or another recognized

testing organization. Those symbols can

only be used if the product successfully

completed testing to the agency’s

standard, which is based on national/

international standards. That is the

closest you can come to ensuring that

the test tool you choose was actually

tested for safety.

What does the CE symbol indicate?

A product is marked CE (Conformité

Européenne) to show it conforms

to health, safety, environment and

consumer protection requirements

established by the European Commis-

sion. Products from outside the Euro-

pean Union cannot be sold there unless

they comply with applicable directives.

But manufacturers are permitted to

self-certify that they have met the

standards, issue their own Declaration

of Conformity, and mark the product

“CE.” The CE mark is not, therefore, a

guarantee of independent testing.

Why are Fluke products different?

Don’t be confused by “Listed” vs.

“Designed to” in your test tools.

IEC sets the standards but does not

test or inspect for compliance. So a

manufacturer can claim to “design

to” a standard with no independent

verification. To be UL-Listed, CSA or

TUV-Certified, a manufacturer must

employ the listing agency to TEST

the product’s compliance with the

standard. Look for the listing agency’s

emblem on the meter.

Go to www.fluke.com/safety to view The

Fluke Electrical Measurement Safety Program

and order your free copy of the Fluke Safety

video. This video makes the standards easy

to understand and can be used as part of

your own internal safety program.

Underwriters

Laboratories (UL)

United States

Department of

Labor Mine Safety

and Health

Administration

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