The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
Yesterday at 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 15
HotLine1 10
Trumpy 8
Texas_Ranger 8
sparkyinak 7
Who's Online
0 registered (), 101 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#101505 - 04/22/01 09:49 AM Re: Grounding ... CEC vs NEC
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
From March issue of EBmag (ebmag.com)

"Both the Canadian Electrical Code (CEC) in Canada and the National Electrical Code (NEC) in the U.S. deal extensively with grounding and bonding issues and for the same reason – to minimize the possibilities of electrical fires and shocks. However, each code tackles the issues in a different way, in many aspects: terminology, materials and methods of installation. "

More:
http://www.ebmag.com/curr/article1.phtml?id=394

Any Comments?

Top
2014 / 2011 NEC & Related Books and Study Guides
#101506 - 04/26/01 06:43 PM Re: Re: Grounding ... CEC vs NEC
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
I notice the requirement in the CEC is for 10 Ft ground rods. Is there also a requirement for a second rod if certain resistance measurements cannot be proven? (Down here (US) We are supposed to be at 25 ohms or less.)



Bill

Top
#101507 - 05/28/01 06:53 PM Re: Re: Grounding ... CEC vs NEC
ElecTrainer Offline
Member

Registered: 02/22/01
Posts: 20
Loc: South Porcupine,ON. CA.
 Quote:
Originally posted by Bill Addiss:
I notice the requirement in the CEC is for 10 Ft ground rods. Is there also a requirement for a second rod if certain resistance measurements cannot be proven? (Down here (US) We are supposed to be at 25 ohms or less.)



Bill


The CEC deals with this problem by design rather than state a specific resistance. For low voltage ie. less than 750 volts, as per section 10-500 "the bonding and grounding conductors will, without becoming damaged, carry the fault current efficiently enough to allow the prompt functioning of overcurrent devices and the voltage rise due to the fault will be limited to a safe level"
In other words fault currents are predicted for worst case conditions and the bonding/grounding system designed to suit.
High voltage ie. over 750 volts has a section (36) dedicated specially to controlling or guarding against dangerous fault conditions to protect equipment and personelle.
Grounding and bonding is a particularly critical subject and is dealt with at an engineering level to attain the best possible safety conditions. Every situation is different and requires due consideration.
ElectTrainer

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals