Elections in Nevada County are heating up with contentious races taking shape for fire districts, school boards and municipal bodies while other races have extended deadlines to allow for more candidates.Many of the races are taking place in Nevada County's more than a dozen school districts, yet one of the hottest races is for seats on the board of directors for the county's consolidated fire district, which was recently rocked by internal strife after its chief stepped down amid allegations of employee abuse. Nevada County Consolidated Fire District also has had budgetary issues that pushed administrators to pursue an ultimately …