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benotype
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Join Date: Nov 2009
Posts: 89

IEC Standard Code for Electrical torquing

11/08/2012 5:05 AM

Good morning,

Can anyone help me with IEC standard codes for electrical equipment Torquing?

Thank you for your positive responses.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: IEC Standard Code for Electrical torquing

11/08/2012 7:21 AM

The fastener manufacturer can, in response to a telephone call.

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benotype
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Join Date: Nov 2009
Posts: 89
#2
In reply to #1

Re: IEC Standard Code for Electrical torquing

11/08/2012 7:43 AM

I am trying to prepare an Electrical Equipment Torquing procedure for HV switchboard,LV switchboard and electric motors. what i want is the acceptable IEC specification to help guide my procedure accordingly. when i get the Vendor documentation i will be more specific. Presently, i do not have the vendor IOM documentation.
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lyn
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#3

Re: IEC Standard Code for Electrical torquing

11/08/2012 7:54 AM

Have you looked at NEMA?
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electricalexpert65
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#4

Re: IEC Standard Code for Electrical torquing

11/08/2012 8:29 AM

I think tightening torques for different sizes of fasteners are given in IEC 60947-1 (Table 4)
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benotype
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Join Date: Nov 2009
Posts: 89
#6
In reply to #4

Re: IEC Standard Code for Electrical torquing

11/09/2012 2:53 AM

Thank you to everyone for your contribution.

@electrical expert. i have been trying to download a free copy of IEC 60947-1, but to no avail. can u help me with a specific link that's free? i would really appreciate it. thank u very much and have a splendid day.
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Joshi
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Location: India
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#7
In reply to #6

Re: IEC Standard Code for Electrical torquing

11/09/2012 3:08 AM
  1. IEC Electrical Standards www.pcschematic.com/Electrical standards Book - 2011ed. Get info - or Order book now!
  2. IEC Standards www.ask.com/IEC+StandardsSearch for IEC Standards Look Up Quick Results now!
  3. IEC standards www.electrical-installation.org/Free access to IEC general rules electrical installation
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jack of all trades
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#5

Re: IEC Standard Code for Electrical torquing

11/08/2012 1:50 PM

This link may be of some help for general Metric torque levels.

Link

.

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obouill
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Location: Grenoble, France
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#8

Re: IEC Standard Code for Electrical torquing

11/09/2012 3:19 AM

Tightening torque must first be coherent with the bolts and nuts quality . All switchgear manufacturers do not use the same bolts quality (stainless or not, class 8x8 , 6x4, ...). And the torque must be adapted to the greasing status of the bolt, not to speak of the pitch of the thread !

Secondly the torque must be coherent with the design of the switchgear (size of the washers, ... to avoid entering in the permanent deformation area of the parts to assemble.

Thirdly, switchgear manufacturers design and test their equipment with specific ratings. Failure to follow the specific instructions may lead to big trouble. For instance, an overtorqued bolt may enter the permanent deformation zone without being noticed, and the failure may happen only some time later .

This is why I would never take the responsibility of producing a general document about tightening torques recommandations ...
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Users who posted comments:

benotype (2); electricalexpert65 (1); jack of all trades (1); Joshi (1); lyn (1); obouill (1); PWSlack (1)

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