load_centers.pdf

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Table of Contents

Introduction...............................................................................2

Residential.Power.Distribution..................................................4

Load.Centers.............................................................................6

Load.Center.Construction..........................................................8

Residential.Circuit.Breakers..................................................... 6

Ground.Fault.Protection...........................................................23

Arc.Fault.Protection.................................................................25

Surge.Protection......................................................................28

Load.Center.Mains..................................................................32

Load.Center.Interrupting.Ratings............................................35

Service.Entrance.Equipment.Load.Centers.............................38

Power.Supply.Systems............................................................39

Load.Center.Grounding...........................................................42

Siemens.Ultimate.Load.Centers.............................................45

Siemens.EQ.Load.Centers......................................................47

Special.Application.Load.Centers............................................49

Load.Center.Catalog.Numbers................................................5

Sizing.The.Load.Center............................................................53

AC.Disconnects.......................................................................62

Residential.Metering...............................................................63

Review.Answers.....................................................................67

Final.Exam...............................................................................68

quickSTEP.Online.Courses......................................................72

Introduction

Welcome.to.another.course.in.the.STEP.series,. S iemens.

T echnical. E ducation. P rogram,.designed.to.prepare.our.

distributors.to.sell.Siemens.Energy.&.Automation.products.

more.effectively..This.course.covers. Basics of Load Centers .

and.related.products.

Upon.completion.of. Basics of Load Centers .you.should.be.

able.to:

•.

Explain.the.role.of.a.load.center.in.residential.

.

power.distribution.

•.

Distinguish.between.the.terms.panelboard.and.load.center

•.

Explain.the.need.for.circuit.protection

•.

Identify.various.components.of.a.Siemens.load.center

•.

Distinguish.between.a.main.breaker.and.main.lug.only.load.

center

•.

Identify.various.power.supply.systems.used.in.residential.

applications

•.

Explain.the.use.of.load.centers.used.as.service-entrance.

equipment

•.

Describe.the.proper.grounding.techniques.of.service.

entrance.and.downstream.panelboards

•.

Describe.the.proper.use.of.GFCI.and.AFCI.circuit.breakers.

in.a.load.center

•.

Describe.the.proper.use.of.the.circuit.breaker.surge.

arrester.in.a.load.center

•.

Identify.various.ratings.of.Siemens.load.centers

2

This.knowledge.will.help.you.better.understand.customer.

applications..In.addition,.you.will.be.able.to.describe.products.

to.customers.and.determine.important.differences.between.

products..We.recommend.that.you.complete. Basics of

Electricity .before.attempting. Basics of Load Centers .

If.you.are.an.employee.of.a.Siemens.Energy.&.Automation.

authorized.distributor,.fill.out.the.final.exam.tear-out.card.and.

mail.in.the.card..We.will.mail.you.a.certificate.of.completion.if.

you.score.a.passing.grade..Good.luck.with.your.efforts.

Siemens.is.a.trademark.of.Siemens.AG..Product.names.

mentioned.may.be.trademarks.or.registered.trademarks.of.their.

respective.companies..Specifications.are.subject.to.change.

without.notice.

National.Electrical.Code®.and.NEC®.are.registered.trademarks.

of.the.National.Fire.Protection.Association®,.Quincy,.MA.0269..

Portions.of.the.National.Electrical.Code.are.reprinted.with.

permission.from.NFPA.70™,.National.Electrical.Code,.Copyright.

©2007,.National.Fire.Protection.Association,.Quincy,.MA.0269..

This.reprinted.material.is.not.the.complete.and.official.position.

of.the.National.Fire.Protection.Association.on.the.referenced.

subject.which.is.represented.by.the.standard.in.its.entirety.

NEMA®is.a.registered.trademark.and.service.mark.of.the.

National.Electrical.Manufacturers.Association,.Rosslyn,.VA.

22209.

Underwriters.Laboratories.Inc.®.and.UL®.are.registered.

trademarks.of.Underwriters.Laboratories.Inc.,.Northbrook,.IL.

60062-2096.

Other.trademarks.are.the.property.of.their.respective.owners.

3

Residential Power Distribution

A. power distribution system .distributes.electrical.power.

throughout.a.building..Power.distribution.systems.are.used.in.

every.residential,.commercial,.and.industrial.building..

Residential Distribution .

Most.of.us.are.familiar.with.the.power.distribution.system.

found.in.the.average.home..Power,.purchased.from.a.utility.

company,.enters.the.house.through.a.meter.that.records.the.

electrical.energy.used..

The.incoming.power.then.goes.to.a.load.center.which.

provides.circuit.control.and.overcurrent.protection..The.power.

is.distributed.from.the.load.center.to.various.branch.circuits.

for.lighting,.appliances,.and.electrical.outlets..Careful.planning.

is.required.so.that.the.power.distribution.system.safely.and.

efficiently.supplies.adequate.electric.service.for.present.and.

possible.future.needs..

4

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Load Center

Additional

Load Center

A/C Disconnect

The National Electrical .

The. National Electrical Code® (NEC®) is.used.extensively.in.

Code® .

the.electrical.industry.. Article 408 .covers.panelboards..Other.

articles.shown.in.the.following.illustration.cover.related.topics.

Conductors

NEC® Article 310

Lighting

NEC® Article 410

Services

NEC® Article 230

Load Center

NEC® Article 408

Overcurrent Protection

NEC® Article 240

Switches

NEC® Article 404

Branch Circuits

NEC® Article 210, 220

Grounding

NEC® Article 250

.

5

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