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Link Break Disconnects

Link Break Disconnects

Link Break Disconnects

(OP)
On distribution systems, in areas of higher fault current, or higher system voltages, especially on heavily loaded UG laterals, construction crews would rather disconnect the load using a link break disconnect, as opposed to opening the cutout door.  The question  which has come up is whether this should be implemented on OH laterals as well.  Using a link break disconnect is obviously more expensive.  Would you have any input on your practices and the reasons why?

RE: Link Break Disconnects

Suggestion: It depends who poses the question. Often, the construction crew follows the Firm practices. There is then a very little choice left. Reasons: increased safety and cost savings.

RE: Link Break Disconnects


“…opening the cutout door” very likely has no intended interrupting rating, and may be for unloaded-circuit isolation only.  This might be verified though cutout-manufacturer’s published data.
   

RE: Link Break Disconnects

Please explain what you mean by "link break." Cutouts and solid blades with the proper ears can be opened under load with the aid of a load buster tool. I think S&C and AB Chance supply them.

RE: Link Break Disconnects

Suggestion: Visit
http://www.usace.army.mil/publications/armytm/tm5-684/chap8.pdf
for:
b. Periodic inspection of fuse links in distribution cutouts. These fuse links may require periodic inspections,
since corrosion of the lower terminal of the fuse link (generally a flexible cable) at the lower open-end of the fuse holder may cause breakage or melting at this point, rather than in the currentresponsive element. Link-break cutouts are particularly susceptible since their link-break mechanisms impose a mechanical strain on fuses.

on page 8-3

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