{"id":60,"date":"2020-11-18T19:02:29","date_gmt":"2020-11-18T19:02:29","guid":{"rendered":"https:\/\/wp-test-site.arcflashadvisors.com\/?page_id=60"},"modified":"2020-11-18T19:02:29","modified_gmt":"2020-11-18T19:02:29","slug":"single-line-diagrams","status":"publish","type":"page","link":"https:\/\/arcflashadvisors.com\/?page_id=60","title":{"rendered":"Single Line Diagrams"},"content":{"rendered":"\n

Single Line Diagrams <\/strong><\/strong><\/h1>\n\n\n\n



The single line diagram is the blueprint for electrical system analysis. It is the first step in preparing a critical response plan, allowing the engineer and client to become thoroughly familiar with the electrical distribution system layout and design in the facility.

Whether you have a new or existing facility, the single line diagram is the vital roadmap for all future testing, service and maintenance actions. As such, the one-line diagram is like a balance sheet for your facility and provides a snapshot of your facility at a moment in time. It needs to be modified as your facility changes to ensure that your systems are adequately protected.

An effective single line diagram will clearly show how the main components of the electrical system are connected, including redundant equipment and available spares. It shows a correct power distribution path from the incoming power source to each downstream load \u2013 including the ratings and sizes of each piece of electrical equipment, their circuit conductors, and their protective devices.

In many process facilities, loads are continually added or removed in small increments. The net effect is not always seen until some part of the system becomes overloaded or exhibits other problems. Many times circuits are added without appropriate modifications of the standard settings on the associated upstream circuit breakers. Regardless of which protective devices you use, they must be coordinated with regard to their time\/current curves and with each other. The single line diagram provides the roadmap to enable proper design of equipment, redundancy, and protection.
NFPA-70E requirements mandate accurate, up-to-date single line diagrams.

To meet these needs, Arc Flash Advisors can conduct a comprehensive site survey to develop one-line diagrams for your facility or to update existing diagrams.  Including:

\u2022Verify process is in place that ensures the as-built drawings are maintained in a current condition
\u2022Confirm loads connected to emergency \/ standby feeders
\u2022Inventory of equipment
\u2022Evaluate design redundancy of critical systems (N, N+1, N+2…) and whether all critical equipment can be maintained without a shutdown
\u2022Verify existence of as-built drawings and that they are adequately available
\u2022Verify potential single points of failure
\u2022Report that outlines the findings by site along with recommended actions
\u2022Update customer-provided one-line drawings down to the 480V Distribution Switchboards
\u2022Provide a copy of one-line electrical diagram in AutoCAD format
\u2022Post as-built drawings at each facility

An up-to-date single line diagram is vital for a variety of service activities including:<\/strong>
\u2022Short circuit calculations
\u2022Coordination studies
\u2022Load flow studies
\u2022Safety evaluation studies
\u2022All other engineering studies
\u2022Electrical safety procedures
\u2022Efficient maintenance

Features & Benefits<\/strong>
\u2022Helps identify fault locations and simplifies troubleshooting
\u2022Ensure safety of personnel
\u2022Stay compliant with NFPA 70E and CSA Z462 requirements
\u2022Ensure safe, reliable operation of facility

Scope of a single line diagram<\/strong>
Single line diagram information normally includes:

\u2022Incoming lines (voltage and size \u2014capacity and rating)
\u2022Incoming main fuses, potheads, cut-outs, switches and main and tie breakers
\u2022Power transformers (rating, winding connection and grounding means)
\u2022Feeder breakers and fused switches Relays (function, use and type)
\u2022Current\/potential transformers (size, type and ratio)
\u2022Control transformers
\u2022All main cable and wire runs with their associated isolating switches and potheads (size and length of run)
\u2022All substations, including integral relays and main panels and the exact nature of the load in each feeder and on each substation
\u2022Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer switch, computer room air conditioning)<\/p>\n","protected":false},"excerpt":{"rendered":"

Single Line Diagrams The single line diagram is the blueprint for electrical system analysis. It is the first step in preparing a critical response plan, allowing the engineer and client to become thoroughly familiar with the electrical distribution system layout and design in the facility. Whether you have a new or existing facility, the single […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"nf_dc_page":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-60","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/pages\/60","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=60"}],"version-history":[{"count":1,"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions"}],"predecessor-version":[{"id":62,"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions\/62"}],"wp:attachment":[{"href":"https:\/\/arcflashadvisors.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}