NEC 6/12 rule clarification

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If you are performing a major home improvement on any of the living areas in your home, it is important that you understand the National Electrical Code (NEC) rules for the placement of electrical receptacles (outlets). This article is based on the NEC 2002 code. Doing the electrical work as a DIY home handyman does not remove the need for you to follow any and all codes and rules.

The NEC basically states that within any living area of a home, you must have an electrical receptacle (outlet) 6 feet from any obstruction or break in the wall, such as a doorway, and no more than 12 feet from the previous electrical receptacle (outlet), Figure 1.

Figure 1 - Spacing of electrical outlets along a wall

The 6 / 12 rule are minimums and in theory there is no reason within the code that you could not have an electrical receptacle (outlet) every foot across the wall space.

Living areas are generally defined as:

living room, grand room, bedroom, dining...
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Electrical protection and lightning protection

I have a query on earthing system design. One designer has submitted me an earthing plan which interconnects the earth electrodes meant for equipment earthing and those for lightning protection purposes. By combining the earth electrodes he achieves overall earth resistance below one ohm required by IS 3043 (Indian standard). But my question is whether this is an acceptable practice followed by industry or the earth electrodes of the two systems (protective earthing and lightning protection) can not be combined this way?
Would appreciate feedback. thanks in advance.
D. Sunil

Answer from Didier Mignardot: When Lightning Protection System (L.P.S.) is implemented, all metal conductors (including the electricity distribution network) must be interconnected.
Everything is described in IEC standard 62305-3 (Protection against Lightning: Physical damage to structures and life hazard) and in particular in the...

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Calculation of cable size

How to calculate cable size, switchgears and fuses for feeders and equipment?

How to calculate cable size, switchgears and fuses for feeders and equipment?

This is a great site... It's really helpful. Thanks for sharing.

I was also looking for transformer & battery size calculations for a turnkey project. And also what are the paramaters I need to consider for calculations? Appreciate if you could help in these subjects...

Regards,
Ram

Hi,
Its very happy to share our technical clarifications and doubts here.

For you clarification of Transfomer Sizing calculation could be followed as
1. Calculate Total Connected Load(KW)(
2. Calc the Total I/P in KW ( Considereing 85% efficiency)
3. Calc Total I/P in KVA (Considering 0.92 Power Factor)
4. Required KVA by mutiplying the Total I/P in KVA by 1.2 times.

Calculation Example
1. Say Total Connected load in KW=1100
2....

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Name: Arif Hussein v Financial Conduct Authority (1.88MB)
"FINANCIAL SERVICES - prohibition order - procedure - whether parts of Applicant's Reply should be struck out - whether Authority should be directed to disclose further documents -Rules 2,5(3)(c) and (d), 8(3)(c), 16(1)(b) and paras 4 (3), 5(2) and 6 Sch 3 Tribunal Procedure (Upper Tribunal) Rules 2008" Name: Steven Maoudis t/a Montana Debt Management vs Financial Conduct Authority (71KB)
"FINANCIAL SERVICES - Decision Notice refusing permission for authorisation to carry on debt adjusting and debt counselling activities- giving of Decision Notice terminated Applicant’s Interim Permission to carry on those activities – Application under Rule5(5) Tribunal Procedure (Upper Tribunal) Rules 2008 for direction to suspend effect of Decision Notice until reference determined - whether Tribunal satisfied that the direction to suspend the effect of the notice would not prejudice the interests of consumers – No -...
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120/208V or 277/480V.... huh?

what does it mean when something is rated 120/208V or 277/480V? What do the two numbers mean?

what does it mean when something is rated 120/208V or 277/480V? What do the two numbers mean?

Help, very confused!

It means it is rated to operate at those two voltages.

Either 120V or 208V.

It means that your source power is 120v from a 2 wire system, or single phase 2 wire. The combination of 120v from the 2 wire system will operate at 208volts. When 120 is added to 120 it essentially equals 208, not 240.If you would like to know, why? I can give you an explanation...

I don't believe that this post is correct. 120/208 VAC is nominal 3 phase voltage (i.e. 120 VAC * SQRT 3) as is 277/480 VAC with the phase to neutral/ground voltage first.

Single phase 2-wire w/neutral like is in most people's houses is nominally 120 VAC to neutral/ground and 240 VAC phase to phase.

William (Bill) L. Mostia, Jr.,...

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IN THE HIGH COURT OF SOUTH AFRICA

(WESTERN CAPE DIVISION, CAPE TOWN)

CASE NO: 21471 /2014

In the matter between:

THE ECONOMIC FREEDOM FIGHTERS First Applicant

JULIUS SELLO MALEMA Second Applicant

FLOYD SHIVAMBU Third Applicant

PAUL RAMAKATSA Fourth Applicant

GODRICH GARDEE Fifth Applicant

MBUYISEN NDLOZI Sixth Applicant

LITCHFIELD KHANYISILE TSHABALALA Seventh Applicant

JOHN ANDILE MNGXITAME Eighth Applicant

NTHAKO MATIASE Ninth Applicant

HLENGIWE OCTAVIA MAXON Tenth Applicant

ELSABE NATASHA LOUW Eleventh Applicant

MAGDALENE MOONSAMY Twelfth...

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The Medical Services Advisory Committee (MSAC) is an independent non-statutory committee established by the Australian Government Minister for Health in 1998.

MSAC appraises new medical services proposed for public funding, and provides advice to Government on whether a new medical service should be publicly funded (and if so, its circumstances) on an assessment of its comparative safety, clinical effectiveness,cost-effectiveness, and total cost, using the best available evidence. Amendments and reviews of existing services funded on the Medical Benefits Schedule (MBS) or other programmes (for example, blood products or screening programmes) are also considered by...

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