It could be a sign of an electrical fire. First, try to locate the source of the smell. If you can't find it, or if the burning smell is coming from an electrical outlet or appliance, shut off the power to that area of the house at the breaker box. If you can't reach the breaker box or shut off the power, evacuate the home and call 911. Do not reenter the home until the emergency electrician in St. John’s, NL says it's safe.