EEP - 8 Steps to Begin Circuit Design

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Subject: 8 steps to begin basic circuit design From: EEP Editorial Team ([email protected]) To: [email protected]; Date: Saturday, April 12, 2014 12:08 AM 27,371 engineers subscribed to Technical Articles. Don't want to receive any more? No problem, unsubscribe Here. Email not displaying correctly? View it in your browser. DOWNLOAD // Excel Spreadsheets | Power Substations Guides | SIEMENS Basics of EE 8 steps to begin basic circuit design (original photo credit: powerswitchboards.com.au) How do we begin to design? What do we need to know? Clearly, plunging into calculations of cable size is of little value unless the Print https://us-mg5.mail.yahoo.com/neo/launch?retry_ssl=1#2120602728 1 of 3 5/13/2014 10:17 AM

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8 Step to Begin Circuit Design

Transcript of EEP - 8 Steps to Begin Circuit Design

Page 1: EEP - 8 Steps to Begin Circuit Design

Subject: 8 steps to begin basic circuit design

From: EEP Editorial Team ([email protected])

To: [email protected];

Date: Saturday, April 12, 2014 12:08 AM

27,371 engineers subscribed to Technical Articles.Don't want to receive any more? No problem, unsubscribe Here.

Email not displaying correctly?View it in your browser.

DOWNLOAD // Excel Spreadsheets | Power Substations Guides | SIEMENS Basics of EE

8 steps to begin basic circuit design (original photo credit: powerswitchboards.com.au)

How do we begin to design?

What do we need to know? Clearly, plunging into calculations of cable size is of little value unless the

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Page 2: EEP - 8 Steps to Begin Circuit Design

type of cable and its method of installation is known. This, in turn, will depend on the installation’s

environment.

At the same time, we would need to know whether the supply was single or three-phase, what the

earthing arrangements (learn about this) were and so on.

Here then is our starting point and it is referred to in Part 3 of the IEE Regulations as ‘Assessment of

General Characteristics’.

Having ascertained all the necessary details, we can decide on an installation method, the type of

cable and how we will protect against electric shock and overcurrents. We would now be ready

to begin the calculation part of the design procedure.

Basically, there are eight stages in such a procedure. These are the same whatever the type of

installation, be it a cooker circuit or a steel wire armoured (SWA) cable feeding a remote garage.

8 steps

Here then are the 8 steps to begin basic circuit design in a simplified form:

Determine the design current Ib1.

Select the rating of the protection In.2.

Select the relevant rating factors (CFs).3.

Divide In by the relevant CFs to give tabulated cable current carrying capacity It.4.

Choose a cable size to suit It.5.

Check the voltage drop (Use MS Excel Spreadsheet to calculate).6.

Check for shock risk constraints.7.

Check for thermal constraints.8.

Reference: Electric Wiring: Domestic – Brian Scaddan IEng, MIET

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