Panelboard Specifications

Panelboards come completely factory assembled and equipped with a main circuit breaker (if specified) and the type, size and number of branch circuit breakers, arranged and numbered as per a panel schedule(s).

Panelboards should be fully rated. Series rated panelboards are not acceptable. Series-rating a panel or switchboard and using lower AIC-rated circuit breakers is an option that could reduce the electrical installation costs of a project, but because of the great risk to the facility and personnel in the event of an electrical fault, properly rating a panel or switchboard’s current interrupting capacity must be a priority.

All multi-pole breakers come with a common trip conection. Branch circuits come arranged using double row construction. Bus sequence is ABC top to bottom, left to right for both top and bottom fed panels. Use at least 100 ampere breaker-connecting bus straps and mounting hardware.

Provisions or space for future breakers should be provided and located at the bottom of the panel and be fully bussed, complete with the necessary mounting hardware.

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Panelboard Specifications

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Control Cable Specifications

Control cables are used to connect instrument transformers, coils of circuit breakers and contactors, control switches, meters, protection devices and other control and monitoring equipment. Control cables have conductors in copper, insulation and outer sheath in PVC and they may have up to 150 cores.

Control cables are mainly used for Equipment control purposes. Each core is identified by a different color or by a number marked on the insulation. In order to avoid electromagnetic interference caused by power cables laid nearby control cables may be shielded.

The electromagnetic shielding material, which is wrapped around the cable underneath the outer jacket serves to prevent electrical noise from affecting the transmitted signal, and to reduce electromagnetic radiation emission from the cable itself. Shielding is typically comprised of metal braiding, metal tape or foil braiding. A shielded cable assembly may also feature a special grounding wire known as a drain wire.

See the Guidelines for Control and CT Wiring found in this dropdowm menu.

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Panelboard CAD/Export Generator

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