Biddle MEGGER - Page 31

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Vi

SUPPLEMENTARY

INSTRUCTIONS

FOR

USING

““MEGGER”

INSULATION

TESTERS

Testing

Leads

Inferior

or

defective

testing leads

will

cause

erroneous

and

misleading

results

of

insulation

resistance

tests.

Take

care

in

this.

respect.

Uninsulated

Leads

To

avoid

error

due

to

the

insulation

of

leads,

place

the

“Megger”

instrument

close

to

the

ungrounded

terminal

or

con-

ductor

of

the

apparatus

under

test

and

connect

a

short

piece

of

light

bare

wire

directly

from

the

Line

terminal

of

the

instru-

ment

to

the

apparatus.

If

the

Guard

terminal

is

used,

it

may

be

treated

similarly.

No.

18

or

20

gauge

solid

wire

will

suffice.

Support

the

lead

only

by

its

connections

to

the

instrument

and

the

apparatus.

With

this

method

of

connecting

from

the

Line

terminal,

the

quality

of

the

insulation,

if

any,

of

the

Earth

or

Ground

lead

becomes

unimportant.

Insulated

Leads

Where

dependence

is

placed

on

the

insulation

of

leads

they

must

be

durable

and

of

the

best

quality

insulating

material.

Oil

resistant,

synthetic,

rubber-insulated,

single-conductor

No.

14

stranded

wire

is

recommended.

The

outer

jacket

should

be

smooth,

with

no

outer

braid.

Lugs

should

be

fitted

for

attach-

ing

to

the

instrument

terminals,

and

stout

spring

clips

are

recommended

for

connecting

to

the

apparatus

or

circuit

under

test.

Any

convenient

length

of

lead

may

be

used.

Joints

are

to

be

avoided.

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