information. Refer to EEMAC Standards Publication for more information regarding applications, features and design tests. Individual EEMAC product Standards. lished by EEMAC are similar to those of UL and CSA. See our rat- ings reference sheet for details. EEMAC. The performance ratings estab- lished by IEC, known. Section Operation Requirements. There have been incidents of opposing views or assumptions around how the business of the Product Sections should be.

Author: Tukora Gukora
Country: Jamaica
Language: English (Spanish)
Genre: Art
Published (Last): 24 June 2012
Pages: 169
PDF File Size: 14.52 Mb
ePub File Size: 19.2 Mb
ISBN: 913-8-48985-845-6
Downloads: 56513
Price: Free* [*Free Regsitration Required]
Uploader: Aragore

We can guarantee our MV equipment. What is internal arc resistance? Sampling, Inspection and Tests 9. Is terminology an issue for you? Three insulators shall he selected at random and tested in accordance with Section 4. And, should an arc fault occur, to contain it within a single compartment in the cubicle and divert the hot gases away from personnel. Penetration of the dye into the body of the dielectric shall constitute failure of the lot to meet this standard.

An internal arc fault is one that occurs inside switchgear. If vsual inspection is required on Iota of or more insulators, 50 insulators shall be selected at random from the lot.

General 31 Standard insulators shall conform in all respects wemac the requirements hereinafter stated. Not what you do with it. They have very much to do with a particular installation — how it is to be operated, for example, and what it is to be used for. In a nutshell, arc flash analysis specifies what to do to ensure the safety of personnel when an syandards flashes on site.


Because they are sparked by the way an individual installation is configured and operated, there are just too many variables. Reply Leave a Reply Click here to cancel reply.


The marking shall be legible and durable. Although we manufacturers sometimes propose arc flash analyses as a service, they are usually performed by a competent engineer. What are arc flashes? If more than 4 but less than 10 of the insulators fail to meet the requirements of paragraph 4. They require arc flash analysis. Documents Flashcards Grammar checker. Other factors in arc flash hazards are: Nor do any standards govern arc flashes. Scope 11 These standards cover spool.

Five insulators shall be selected at random and tested in accordance with paragraph 5. It happens when two bare live conductors come together and endangers operating and maintenance personnel. Click here to cancel reply. There lies the only possible terminological confusion: Failure of more than 10 insulators total from both the tirst and second samples shall constitute failure of the lot to meet this standard. Low-frequency Dry Flashover, Ky b. Design tests on insulators of new design shall be made iii accordance with paragraphs 9.

Direct exposure to such heat radiation can cause severe burn injuries.


NEMA contact ratings

As you pointed out, Manufacturers cannot control the way equipment is standsrds. Reply This was a very good article. Transverse Strength, Pounds 2.

Feb 13, 18, 19 – Design Project: An analysis assesses how intense an arc flash may be in a particular installation by factoring in parameters like those I listed above short-circuit current, relay settings, fault current flow, etc.

Featured Bloggers Frederic Abbal. View the Blogger Directory. Not to prevent the arc fault flash itself. Its goal is to prevent damage and injury.

January 2, 9. So, when customers ask for the arc flash characteristics of our medium-voltage switchgearI scratch my head.

The standard color of the glaze shall be brown. Dimensions and Characteristics 5. The entire surface shall be relatively free from imperfections. Any variations in these di.

Math 8 HW 50 Dilations. Other factors in arc flash hazards are:. Yet some occupational health and safety standards and regulations relate to arc flash. Stnadards flashes have little to do with devices. Your company, a manufacturer, happens to have a large number of very competent engineers, in the power system engineering group, who can perform this work!

Test specimens shall be selected from insulators destroyed in other tests and tested in accordance with Section 5.