An electrical contractor is an individual or group that specialized work in designing, installation, and maintenance of electrical systems. An electrical contractor hires electricians to do the work for the firm. They are licensed and insured to ensure safe operation of the business and protecting the group, employees and clients from insurance liability issues. Electrical contractors are classified in their type of work. An Outside or Line contractors are responsible for maintaining the distribution lines of its high-voltage power transmission. The Inside electrical contractors supplies electricity to any structure that is within the property's boundary. An Integrated building systems contractor works with low-voltage installations like back-up power, climate controls, and any telecommunication systems.