Siemens FSV Manuale di programmazione

SIEMENS

Instructions

Installation

Operation

Maintenance

3248

Vacuum

Circuit

Breakers

Type

FSV

and

MSV

—

•

;

HENS

•

SttSil

;

IrWl

•

;

’

{

)

Tjt

•

(

sii

ssrs

‘

•

fXii

iters

;

rffc

•

;

Courtesy of NationalSwitchgear.com

Introduction

THIS

EQUIPMENT

CONTAINS

HAZARDOUS

VOLTAGES

AND

MECHANICAL

PARTS

WHICH

MOVE

HIGH

SPEED

AND

MAY

CONTROLLED

REMOTELY

SEVERE

PERSONAL

JURY

PROPERTY

DAMAGE

CAN

RESULT

SAFETY

STRUCTIONS

ARE

NOT

FOLLOWED

ONLY

QUALIFIED

PERSONNEL

SHOULD

WORK

AROUND

THIS

EQUIP

MENT

AFTER

BECOMING

THOROUGHLY

FAMILIAR

WITH

ALL

WARNINGS

SAFETY

NOTICES

AND

MAINTENANCE

PRO

CEDURES

CONTAINED

HEREIN

THE

SUCCESSFUL

AND

SAFE

OPERATION

THIS

EQUIPMENT

DEPENDENT

UPON

PROPER

HANDLING

INSTALLATION

OPERATION

AND

MAINTENANCE

CAUTION

Indicates

minor

personal

injury

property

damage

can

result

proper

precautions

are

not

taken

DANGER

Power

circuit

breakers

are

applied

high

voltages

and

have

mechanical

parts

which

move

high

speeds

and

will

cause

death

personal

injury

and

property

damage

Qualified

Person

For

the

purpose

this

manual

and

product

labels

qual

ified

person

one

who

familiar

with

the

installation

con

struction

and

operation

the

equipment

and

the

hazards

involved

addition

has

the

following

qualifications

(

)

trained

and

authorized

energize

clear

ground

and

tag

circuits

and

equipment

accordance

with

established

safety

practices

(

)

trained

the

proper

care

and

use

protective

equip

ment

such

rubber

gloves

hard

hat

safety

glasses

face

shields

flash

clothing

etc

accordance

with

tablished

safety

practices

avoid

injuries

due

electrical

shock

burns

and

entanglement

moving

parts

this

equipment

must

installed

operated

and

maintained

only

qualified

persons

thoroughly

familiar

with

the

equipment

struction

manual

and

drawings

Field

Service

Operation

Siemens

Energy

Automation

Inc

can

provide

competent

well

trained

Field

Service

Representatives

provide

technical

guidance

and

advisory

assistance

for

the

installation

over

haul

repair

and

maintenance

Siemens

Energy

Automa

tion

Inc

equipment

processes

and

systems

Contact

regional

service

centers

sales

offices

factory

for

details

Signal

Words

Distinctive

signal

words

(

DANGER

WARNING

CAUTION

)

are

used

this

instruction

book

and

product

labels

indicate

degrees

hazard

that

may

encountered

the

user

These

signal

words

are

defined

below

DANGER

Indicates

death

severe

personal

injury

substantial

property

damage

will

result

proper

precautions

are

not

taken

WARNING

Indicates

death

severe

personal

injury

substantial

property

damage

can

result

proper

precautions

are

not

taken

Courtesy of NationalSwitchgear.com

Table

Contents

General

Introduction

Receiving

Storage

‘

Found

’

Tests

Installation

Checkout

Circuit

Breaker

Elevations

Technical

Data

Rating

Plate

Content

Rating

Summary

Service

Conditions

General

Performance

Data

Interrupter

Operator

Description

—

General

Interrupter

Operator

Subassembly

Construction

Breaker

Pole

Current

Path

Assembly

Vacuum

interrupter

The

Arc

Quenching

Principle

Switching

Operation

Operating

Mechanism

Construction

Indirect

Releases

Motor

Operating

Mechanism

Auxiliary

Switches

Mode

Operation

Charging

Closing

Trip

Free

Operation

Opening

Rapid

Auto

Reclosing

Manual

Operation

Manually

Charging

the

Closing

Spring

Manual

Closing

Manual

Opening

Elementary

Diagram

Indirect

Releases

(

Dual

Trip

Undervoltage

)

Secondary

Release

Undervoltage

Release

Construction

and

Mode

Operation

Capacitor

Trip

Device

Interrupter

Operator

Maintenance

General

Inspection

Check

List

Hand

Tools

Recommended

General

Metric

English

Minimum

Maintenance

Schedule

Lubrication

Overhaul

Lubrication

the

Operating

Mechanism

Vacuum

Interrupters

Contact

Erosion

Interrupter

Vacuum

Check

Mechanical

High

Potential

Testing

and

Electrical

Interrupter

Vacuum

Check

Vacuum

Tube

Replacement

Hydraulic

Shock

Absorber

Vehicle

Description

Vehicle

Function

and

Operational

Interlocks

Alignment

Interlocks

Breaker

Racking

Interlock

(

Lever

Type

)

Breaker

Racking

Interlock

(

Screw

Type

)

Plunger

Position

Mechanical

Interlock

Automatic

Closing

Spring

Release

Continuous

Current

Interlock

Control

Cable

and

Connection

Box

Insulating

Barrier

Type

FSV

Front

Hinged

Panel

Type

FSV

Cubicle

Interface

Barrier

for

Type

MSV

FSV

Circuit

Breakers

Vehicle

Maintenance

Vehicle

Lubrication

Warranty

Courtesy of NationalSwitchgear.com

Table

Contents

Note

The

instructions

contained

within

this

manual

are

necessary

for

the

safe

installation

maintenance

and

operation

this

equip

ment

this

manual

misplaced

lost

replacement

manuals

are

available

through

the

local

Siemens

Energy

Automation

Inc

sales

office

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

’

purposes

the

matter

should

referred

the

local

Siemens

Energy

Automation

Inc

sales

office

THE

CONTENTS

THIS

INSTRUCTIONAL

MANUAL

SHALL

NOT

BECOME

PART

MODIFY

ANY

PRIOR

EXISTING

AGREEMENT

COMMITMENT

RELATIONSHIP

THE

SALES

CONTRACT

CONTAINS

THE

ENTIRE

OBLIGATION

SIEMENS

ENERGY

AUTOMATION

INC

THE

WARRANTY

CONTAINED

THE

CONTRACT

BETWEEN

THE

PARTIES

THE

SOLE

WARRANTY

SIEMENS

ENERGY

AUTOMATION

INC

ANY

STATEMENTS

CONTAINED

HEREIN

NOT

CREATE

NEW

WARRANTIES

MODIFY

THE

EXISTING

WARRANTY

drawings

other

supplementary

instructions

for

specific

applications

are

forwarded

with

the

manual

separately

they

take

precedence

over

any

conflicting

incomplete

information

this

manual

Courtesy of NationalSwitchgear.com

Table

Illustrations

Circuit

Breaker

Handling

Instructions

MSV

Breaker

Front

and

Side

Elevation

View

FSV

Breaker

Front

and

Side

Elevation

View

Rating

Plate

Vacuum

Breaker

Vacuum

Breaker

Section

Through

Vacuum

Breaker

Pole

Section

Through

Vacuum

Interrupter

Section

Through

The

Vacuum

Breaker

Vacuum

Breaker

Mechanism

Closed

Position

and

Tripping

Springs

Charged

Operating

Mechanism

Details

Closing

Spring

Charging

Components

Operating

Mechanism

Open

Position

Tripping

Spring

Charged

and

Latched

View

Mechanism

Breaker

Shaft

Open

Position

Front

View

Mechanism

Enclosure

Arranged

for

Manual

Operation

Operator

Sequential

Operation

Diagram

Typical

Elementary

Diagram

Construction

Shunt

Release

Latch

Detail

Shunt

Release

Shown

Charged

Latch

Detail

Undervoltage

Release

Shown

Charged

Undervoltage

Blocking

Feature

Capacitor

Trip

Device

Lubrication

Operator

Typical

Primary

Interrupter

Contact

Life

Curves

Contact

Erosion

Check

Lower

Pole

Support

with

Insulated

Coupler

Primary

Contact

Closed

Free

Position

Primary

Contact

Forced

Open

Manual

Pressure

Vacuum

Tube

Replacement

Illustration

Showing

Required

Technique

for

Fastening

Terminal

Clamp

Hardware

Details

the

Breaker

Racking

Interlock

Type

FSV

Details

the

Breaker

Racking

Interlock

Type

MSV

Details

the

Breaker

Racking

Interlock

Internal

Mechanism

Enclosure

Details

the

Automatic

Closing

Spring

Dischrge

System

Type

MSV

Details

the

Automatic

Closing

Spring

Discharge

System

Type

FSV

1200

2000

and

3000

Amp

Continuous

Current

Interlock

Orientation

Control

Cable

Connection

Detail

Insulating

Barrier

Type

FSV

Hinged

Front

Panel

Cubicle

Barriers

for

Type

MSV

Circuit

Breaker

Figure

Courtesy of NationalSwitchgear.com

General

Page

Introduction

Receiving

Circuit

breakers

are

normally

shipped

from

the

factory

com

pletely

assembled

inspected

tested

and

packed

Immedi

ately

upon

receipt

breaker

check

each

item

with

the

shipping

manifest

and

make

examination

for

evidence

any

dam

age

that

may

have

occurred

during

shipment

removing

pack

aging

carefully

with

correct

tools

where

necessary

any

shortage

damage

indication

rough

handling

found

immediately

call

the

attention

the

local

freight

agent

handling

the

shipment

Proper

notation

should

made

him

the

freight

bill

This

prevents

any

controversy

when

claim

made

and

facilitates

adjustment

Also

immediately

file

damage

claim

with

the

transportation

company

and

notify

the

nearest

Siemens

sales

representative

The

MSV

and

FSV

series

vacuum

circuit

breakers

are

pre

cision

built

devices

designed

function

efficiently

under

nor

mal

operating

conditions

They

are

designed

and

manufactured

operate

within

the

ANSI

standards

for

“

Indoor

oiless

circuit

breakers

Performance

requirements

these

stan

dards

are

met

exceeded

these

designs

Specific

Standards

which

apply

include

IEEE

Standard

Rating

Structure

Preferred

Ratings

and

Required

Capabilities

IEEE

Standard

Test

Procedures

IEEE

Standard

Application

Guide

The

successful

performance

and

application

these

vacuum

breakers

depends

much

proper

installation

and

main

tenance

does

good

design

and

careful

manufacture

The

instructions

included

this

book

are

necessary

for

safe

installation

maintenance

and

operation

and

are

provided

aid

you

obtaining

longer

and

economical

service

from

your

Siemens

circuit

breakers

For

proper

installation

and

opera

tion

—

resulting

better

service

and

lower

maintenance

costs

—

this

information

should

distributed

your

operators

and

engineers

carefully

following

these

instructions

difficulties

should

avoided

However

they

are

not

intended

cover

all

details

variations

that

may

encountered

connection

with

the

stallation

operation

and

maintenance

this

equipment

Should

additional

information

desired

including

replace

ment

instruction

books

contact

your

Siemens

representative

37.04

37.06

37.09

37.010

Note

Damage

claims

must

processed

within

the

time

period

specified

the

carrier

Siemens

cannot

held

responsi

ble

for

shipping

damage

either

external

internal

the

inspection

not

made

and

claim

forwarded

within

the

set

time

limit

Courtesy of NationalSwitchgear.com

General

Page

Circuit

breakers

are

normally

shipped

from

the

factory

com

pletely

assembled

Observe

weight

markings

the

carton

and

ensure

that

capable

handling

equipment

used

Remove

packaging

carefully

with

the

correct

tools

Check

each

item

with

the

shipping

manifest

any

shortage

damage

found

immediately

call

the

attention

the

local

freight

agent

handling

the

shipment

Proper

notation

should

made

him

the

freight

bill

This

prevents

any

contro

versy

when

claim

made

and

facilitates

adjustment

gasps

Remove

ramp

pieces

nailed

the

back

the

pallet

;

•

rrs

ifs

rPSKi

;

Bill

Air

TBES

iisp

vfm

‘

When

moving

breaker

location

with

fork

lift

observe

weight

and

lifting

locations

the

carton

Carefully

remove

carton

and

plastic

cover

Slips

•

wmm

•

Remove

hold

down

bolt

and

angle

located

the

front

and

back

the

breaker

iJli

iSK

‘

•

;

Wfc

;

firr

flifi

;

sal

’

When

moving

breaker

location

with

crane

observe

weight

and

sling

lifting

locations

the

carton

Use

spreader

prevent

frame

distortion

and

damage

the

barriers

Carefully

remove

carton

and

plastic

cover

Place

ramp

pieces

front

the

pallet

line

with

the

breaker

wheels

and

nail

pallet

shown

Slowly

roll

the

breaker

off

the

pallet

Figure

Circuit

Breaker

Handling

Instructions

Courtesy of NationalSwitchgear.com

General

Page

Storage

NOTE

The

circuit

breaker

should

installed

soon

possible

storage

necessary

‘

Found

tests

are

recommended

prior

and

after

storage

for

comparison

For

storage

the

circuit

breakers

should

kept

indoors

clean

dry

protected

location

where

they

will

not

exposed

such

items

dirt

construction

dust

corrosive

atmospheres

mechanical

abuse

rapid

temperature

variation

Outdoor

storage

circuit

breakers

not

recommended

breakers

must

stored

outdoors

they

must

completely

covered

and

protected

from

the

elements

heat

source

must

provided

prevent

condensation

and

subsequent

corro

sion

Covering

should

allow

for

ventilation

Often

500

watts

heat

per

breaker

used

recommended

that

periodic

inspection

the

breakers

made

during

storage

and

necessary

procedures

adjusted

keep

the

breakers

proper

condition

Before

testing

the

procedures

and

safety

precautions

indi

cated

High

Potential

Testing

and

Interrupter

Vacuum

Check

page

must

reviewed

With

the

breaker

open

check

each

phase

across

the

open

contacts

connecting

from

the

upper

the

lower

primary

disconnects

With

the

circuit

breaker

closed

check

phase

and

each

phase

ground

dielectric

test

secondary

and

control

circuits

should

made

1125

volts

for

one

minute

desired

contact

resistance

tests

can

made

using

Ductor

Make

permanent

record

all

tests

performed

Installation

Checkout

“

Found

”

Tests

The

following

agenda

provides

convenient

check

list

tivities

performed

while

preparing

the

circuit

breaker

for

use

and

prior

insertion

into

the

cubicle

When

the

equipment

received

perform

and

record

“

Found

”

insulation

tests

using

megger

Doble

tests

give

initial

value

for

future

comparative

indication

insulation

change

Contact

resistance

tests

can

also

made

using

ductor

This

recommended

for

all

new

circuit

breakers

especially

they

are

stored

for

extended

periods

they

may

absorb

moisture

and

contaminants

This

should

also

done

after

storage

and

prior

placing

breakers

into

service

Changes

values

between

subsequent

tests

should

eval

uated

and

corrective

action

taken

where

needed

Since

wide

variations

can

occur

insulation

values

and

con

tact

resistance

because

atmospheric

conditions

contami

nation

and

type

test

equipment

discrete

values

cannot

given

However

making

and

recording

these

tests

new

equipment

and

again

regular

intervals

will

give

compar

ative

indication

insulation

and

contact

resistance

change

Maintaining

permanent

record

these

values

for

each

cir

cuit

breaker

should

part

the

Maintenance

Program

Insulation

resistance

tests

should

made

verify

the

insulation

integrity

These

can

include

megger

Dobel

tests

possible

high

potential

test

should

made

for

one

minute

DANGER

Hazardous

voltages

and

high

speed

chanical

parts

will

cause

death

severe

personal

injury

and

property

damage

Read

instruction

manual

observe

safety

structions

and

use

qualified

personnel

Prepare

circuit

breaker

for

insertion

into

its

cubicle

follows

Carefully

remove

packaging

Note

Vacuum

breakers

are

normally

supplied

with

their

primary

contacts

open

Press

“

TRIP

”

(

Red

)

“

”

(

black

)

and

again

TRIP

(

Red

)

push

buttons

confirm

this

true

See

Fig

Front

elevations

Carefully

note

and

check

rating

plate

ensure

maximum

voltage

continuous

current

interruption

rating

and

con

trol

voltages

are

compatible

with

the

system

and

the

bicle

into

which

the

breaker

inserted

Remove

breaker

from

the

shipping

skid

following

require

ments

shown

pictorially

Figure

Remove

interphase

and

external

barriers

Note

the

inter

phase

barriers

are

dissimilar

from

the

external

barriers

and

that

this

dissimilarity

must

recognized

when

stalling

the

barriers

RATED

VOLTS

(

MAX

)

4.75

8.25

15.0

TEST

VOLTAGE

000

Courtesy of NationalSwitchgear.com

General

Page

Perform

careful

visual

inspection

noting

any

damage

which

may

have

occurred

shipment

Clean

all

dust

dirt

and

foreign

materials

accumulated

shipment

Using

procedures

described

the

maintenance

section

this

manual

carry

out

vacuum

check

POO

Complete

manual

spring

charge

and

trip

operation

Reinstall

all

interphase

and

external

barriers

(

see

above

)

Check

primary

contact

assemblies

Fingers

should

fully

engaged

spring

loaded

and

arranged

with

sym

metry

about

the

axis

the

primary

stud

energize

cubicle

control

power

and

install

plug

jumper

between

cubicle

secondary

disconnects

and

those

the

breaker

energize

control

power

springs

should

charge

With

the

local

control

switch

and

trip

breaker

(

Lever

type

racking

only

)

Note

that

with

the

breaker

closed

that

the

racking

release

handle

(

Fig

and

)

cannot

raised

Open

breaker

pressing

trip

button

and

note

the

racking

lever

may

freely

raised

(

Screw

type

racking

only

)

Refer

the

panel

mounted

cautionary

statement

and

safety

instructions

(

reproduc

tion

below

)

Read

and

understand

this

information

before

inserting

the

circuit

breaker

into

the

cubicle

SAFETY

INSTRUCTIONS

FOR

CIRCUIT

BREAKERS

WITH

SCREW

RACKING

THIS

CUBICLE

MAY

EQUIPPED

WITH

KEY

TYPE

INTERLOCK

THE

LOCK

BOLT

MUST

THE

WITHDRAWN

POSITION

AND

THE

CIRCUIT

BREAKER

OPEN

BEFORE

ATTEMPTING

CHANGE

POSITION

BREAKER

BEFORE

INSERTING

BREAKER

THE

FOLLOWING

NORMAL

OPERATING

CONDITIONS

SHOUl

VERIFIED

THE

DRIVE

NUT

FULLY

RACKED

OUT

AGAINST

STOP

AND

BREAKER

OPEN

PUSH

BREAK

CUBICLE

DISCONNECT

POSITION

WHERE

INTERLOCK

PLUNGER

WILL

STRIKE

POSITIVE

STOP

RAISE

RACKING

RELEASE

HANDLE

AND

PUSH

BREAKER

TEST

POSITION

WHERE

WILL

MAKE

POSITIVE

STOP

AND

WILL

AUTOMATICALLY

COUPLED

THE

DRIVE

MECHANISM

MOVING

THE

BREAKER

BETWEEN

THE

DISCONNECT

AND

TEST

POSITION

ACCOMPLISHED

FIRST

RAISING

THE

RACKING

RELEASE

HANDLE

AND

EITHER

PUSHING

BREAKER

FROM

DISCONNECT

TEST

POSITION

PULLING

BREAKER

FROM

THE

TEST

DISCONNECT

POSITION

NOT

RECOMMENDED

THAT

THE

BREAKER

SCREW

RACKED

FROM

DISCONNECT

TEST

POSITION

(

ONLY

POSSIBLE

THE

BREAKER

RACKING

RELEASE

HANDLE

RAISED

)

THIS

DONE

BREAKER

WILL

NOT

AUTOMATICALLY

STOP

TEST

POSITION

CLOCKWISE

CRANK

ROTATION

WILL

MOVE

BREAKER

FROM

TEST

CONNECTED

POSITION

COUNTERCLOCKWISE

ROTATION

WILL

MOVE

BREAKER

FROM

CONNECTED

TEST

POSITION

UPON

REACHING

EITHER

CONNECTED

TEST

POSITION

BREAKER

WILL

AUTOMATICALLY

STOP

AND

LATCH

PLACE

THE

BREAKER

MAY

REMOVED

FROM

THE

CUBICLE

RAISING

THE

RACKING

RELEASE

HANDLE

AND

PULLING

THE

BREAKER

FROM

THE

DISCONNECT

POSITION

UNTIL

FULLY

WITHDRAWN

FROM

THE

CUBICLE

THE

KEY

INTERLOCK

SPECIFIED

USED

LOCK

THE

BREAKER

•

TRIP

FREE

’

LOCK

THE

BREAKER

TRIP

FREE

PROCEED

FOLLOWS

WITH

BREAKER

CONNECTED

POSITION

AND

LOCK

BOLT

WITHDRAWN

TURN

DRIVE

MECHANISM

CRANK

EXACTLY

FOUR

(

)

TURNS

COUNTERCLOCKWISE

DIRECTION

TURN

KEY

LOCK

EXTEND

LOCK

BOLT

BREAKER

NOW

LOCKED

TRIP

FREE

CONDITION

CAUTION

RELEASE

INTERLOCK

AND

RETURN

BREAKER

NORMAL

CONDITION

TURN

KEY

WITHDRAW

LOCK

BOLT

THEN

TURN

CRANK

CLOCKWISE

DIRECTION

UNTIL

STOPS

810

099

001

Perform

and

record

results

the

“

found

”

tests

Com

pare

with

pre

storage

“

Found

”

test

values

stored

energize

control

power

and

remove

plug

jumper

Coat

movable

primary

and

secondary

disconnects

with

light

film

Siemens

contact

lubricant

171

370

002

CIRCUIT

BREAKER

EQUIPPED

WITH

SCREW

RACKING

AND

MAY

INCLUDE

KEY

TYPE

INTERLOCK

WELL

KNOW

HOW

THIS

EQUIPMENT

OPERATED

BEFORE

ATTEMPTING

INSERT

RACK

CIRCUIT

BREAKER

FAILURE

COULD

RESULT

PERSONAL

INJURY

AND

PROPERTY

DAMAGE

DANGER

OBSERVE

SAFETY

INSTRUCTIONS

AND

RESTRICT

OPERATION

QUALIFIED

PERSONNEL

ONLY

744

191

001

HAZARDOUS

VOLTAGES

ASSOCIATED

WITH

THE

APPLICATION

THIS

BREAKER

WILL

CAUSE

DEATH

PERSONAL

INJURY

AND

PROPERTY

DAMAGE

Before

proceeding

with

the

initial

circuit

breaker

insertion

and

racking

the

bus

certain

the

bus

energized

Courtesy of NationalSwitchgear.com

General

Page

Move

breaker

fully

connected

position

ener

gized

bus

and

trip

breaker

from

main

control

position

lock

out

key

interlock

has

been

provided

place

this

interlock

the

breaker

locked

out

”

position

key

moved

and

perform

operation

Check

that

the

breaker

has

gone

trip

free

Open

the

interlock

key

held

position

and

repeat

the

closing

trial

The

breaker

now

should

successfully

The

breaker

should

now

ready

for

service

FSV

circuit

breakers

examine

aramid

cords

ensure

they

are

aligned

over

each

the

guides

(

refer

page

Fig

for

location

)

Insert

breaker

into

its

cubicle

and

rack

the

discon

nect

”

position

Reenergize

control

power

Advance

the

breaker

the

“

test

position

and

breaker

electrically

Try

opening

operation

Observe

that

the

breaker

closes

and

opens

During

this

racking

exercise

note

the

alignment

the

stationary

and

movable

secondary

disconnects

Check

also

the

alignment

between

the

auxiliary

switch

bayonet

cubicle

wall

and

operating

yoke

breaker

See

Fig

and

reference

the

breaker

operating

yoke

Circuit

Breaker

Elevations

Typical

front

elevations

and

side

elevations

the

type

MSV

and

FSV

Vacuum

Circuit

Breakers

are

shown

figures

and

The

MSV

250

circuit

breaker

has

front

panel

design

about

higher

than

shown

for

use

with

type

‘

’

ground

and

test

devices

The

cubicle

barrier

about

shorter

for

this

design

The

cubicle

and

breaker

are

not

interchangeable

without

changing

panels

WARNING

fully

connected

breaker

controls

high

volt

age

and

currents

Improper

use

can

cause

death

personal

injury

property

damage

Perform

initial

racking

connect

position

energized

bus

energized

bus

avoidable

obtain

appropriate

clearances

before

beginning

the

two

steps

Courtesy of NationalSwitchgear.com

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