* Con Ed reduces voltage in Brooklyn neighborhoods

* Company locked out union workers on Sunday

* Heat wave to bake New York through weekend

* Labor talks to resume on Friday

By Scott DiSavino

NEW YORK, July 5 (Reuters) - Contract talks between Consolidated Edison and locked out workers will resume on Friday while replacement crews worked to end additional brownouts as New York City sweltered in a prolonged heat wave.

The company and the union were in a negotiating session on Thursday that ended without any deal. Spokesmen for both Con Edison and the union told Reuters that discussions will resume on the following day.

High temperatures in New York, the biggest metropolitan area in the United States, were expected to reach the 90s Fahrenheit (32 Celsius) through the weekend, according to AccuWeather.com.

Con Edison said it reduced the voltage by 5 percent in several Brooklyn neighborhoods Wednesday night as a precaution to protect the system and maintain service as crews fix equipment problems, the company said in a statement.

On Thursday afternoon, the company expanded the voltage reductions to several other Brooklyn neighborhoods to reduce the strain on the grid as crews work on equipment problems in those additional communities.

The latest series of voltage reductions was the first since the company locked out its 8,500-member unionized workers on Sunday after contract talks broke down.

Con Edison said the voltage reductions had nothing to do with the lockout, noting the company had also reduced voltage during a heat wave in June, before the lockout started, after heavy air conditioning usage strained the grid in parts of Brooklyn and Queens.

The union, however, said the voltage reductions were a sign that Con Edison could not keep the system running without the union workers.

"This is what we have been saying all along, that the company would run into these problems when the weather heats up. They needed to reduce voltage because they could not keep the system up," John Melia, a union spokesman, said.

"This is an extremely dangerous situation for the people of New York," Melia said, noting that replacement workers were getting hurt due to a lack of experience.

The company said a couple of replacement workers had suffered minor burns, but noted the crews in the field were qualified to do the work.

"Many of the managers out in the field came up through the union and did the kind of work needed to maintain the system in the past," Con Edison spokeswoman Sara Banda told Reuters.


OK TO USE AIR CONDITIONER

So far, these voltage reductions were relatively minor.

The company did not ask the homes and businesses in the affected Brooklyn neighborhoods to take any special measures, noting it was O.K to use air conditioning and other appliances.

But the utility continued to ask all its 3.2 million customers in New York City and Westchester County to continue to conserve energy during the heat wave.

Customers don't lose power in a voltage reduction, but incandescent lights, hot water heaters and some motors are affected.

The company did not give details on the equipment repairs being conducted by crews, largely made up of Con Ed managers.

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  • Locked-out workers demonstrate outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • The son of a locked-out worker holds a sign outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • Locked-out workers demonstrate outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • Locked-out workers demonstrate outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • Locked-out workers demonstrate outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • Locked-out workers demonstrate outside Consolidated Edison headquarters, in New York, Thursday, July 5, 2012. Consolidated Edison and the union representing its employees are returning to the bargaining table. Talks were scheduled to resume Thursday afternoon, while the picket lines in New York's Union Square grow. Pressure is mounting on both sides to resume negotiations after they failed last weekend. On Thursday, the company put out a full page ad blasting the union. (AP Photo/Richard Drew)

  • A locked-out Consolidated Edison worker and union member rallies co-workers as they picket outside the company's headquarters in New York, Monday, July 2, 2012. Members of Local 1-2 of the Utility Workers of America protested as their leadership plotted its next move following failed contract talks and a lockout. A union spokesman said Harry Farrell, president of Local 1-2 of the Utility Workers of America, on Monday will call for federal mediators to intervene to get talks started again. (AP Photo/Kathy Willens)

  • Consolidated Edison distribution mechanic Lacey Craft uses a Con Edison traffic cone as a megaphone as he rallies workers during a picket outside the company's headquarters in New York, Monday, July 2, 2012 as managers entered the building. Members of Local 1-2 of the Utility Workers of America protested as their leadership plotted its next move following failed contract talks and a lockout. (AP Photo/Kathy Willens)

  • Consolidated Edison mechanic John Lucchini gets locked-out coworkers to react as they picketed outside the company's headquarters in New York, Monday, July 2, 2012. Members of Local 1-2 of the Utility Workers of America protested as their leadership plotted its next move following failed contract talks and a lockout. (AP Photo/Kathy Willens)

  • Locked out Consolidated Edison workers, including distribution mechanic Lacey Craft, center, react as managers left company's headquarters for a lunch break in New York, Monday, July 2, 2012. Members of Local 1-2 of the Utility Workers of America protested across the city as their leadership plotted its next move following failed contract talks and a lockout. (AP Photo/Kathy Willens)

  • Locked out Consolidated Edison workers shout out as company managers enter or leave the company headquarters in New York, Monday, July 2, 2012. Members of Local 1-2 of the Utility Workers of America picketed and protested noisily as their leadership plotted its next move following failed contract talks and a lockout. (AP Photo/Kathy Willens)

  • Consolidated Edison workers gather in front of a Con Ed building in New York, Monday, July 2, 2012. Unionized workers with Consolidated Edison in New York City will be picketing as their leadership plots their next move following failed contract talks and a lockout. (AP Photo/Seth Wenig)