12/27/2023 0 Comments Surface mount terminal blocksIn a U.S.-style board, breaker positions are numbered left-to-right, along each row from top to bottom. Breaker arrangement īreakers are usually arranged in two columns. In Canadian service entrance panelboards the main switch or circuit breaker is located in a service box, a section of the enclosure separated from the rest of the panelboard, so that when the main switch or breaker is switched off no live parts are exposed when servicing the branch circuits. The branch circuit bonding conductors are secured to a terminal block attached directly to the panelboard enclosure, which is itself grounded.ĭuring servicing of the distribution board, when the cover has been removed and the cables are visible, American panelboards commonly have some live parts exposed. The neutral conductors are secured to a neutral bus using screw terminals. Residential and light commercial panels are generally referred to as load centers and employ plug-in breakers. Panelboards are more common in commercial and industrial applications and employ bolt-on breakers. ![]() Busbars carry the current from incoming line ( hot) conductors to the breakers, which are secured to the bus with either a bolt-on connection (using a threaded screw) or a plug-in connection using a retaining clip. Some panelboards are provided with a door covering the breaker switch handles, but all are constructed with a dead front that is to say the front of the enclosure (whether it has a door or not) prevents the operator of the circuit breakers from contacting live electrical parts within. North American distribution boards are generally housed in sheet metal enclosures, with the circuit breakers positioned in two columns operable from the front. In the United Kingdom, a distribution board designed for domestic installations is known as a consumer unit. Normally, a main switch, and in recent boards, one or more residual-current devices (RCDs) or residual current breakers with overcurrent protection (RCBOs) are also incorporated. ![]() ![]() JSTOR ( June 2014) ( Learn how and when to remove this template message)Ī distribution board (also known as panelboard, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.Unsourced material may be challenged and removed.įind sources: "Distribution board" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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