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| Maximum 4 cal/cm^2 for panels to 250 Volts? NESC 410-1 https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=5370 |
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| Author: | Jim Phillips (brainfiller) [ Sun Oct 11, 2020 11:30 am ] |
| Post subject: | Maximum 4 cal/cm^2 for panels to 250 Volts? NESC 410-1 |
The 2017 Edition of the National Electrical Safety Code (IEEE C2) contains Table 410-1 Clothing and clothing systems for voltages 50 V to 1000V (ac). This table lists the maximum arc rating necessary for protection from the arc flash hazard based on equipment type. 4 cal/cm^2 is listed for panelboards 50V to 250 V Note (1) [applies to entire table] This table was developed from fault testing based on equipment type and is independent of fault current unless otherwise noted. Note (2) [specific 50 V – 250 V panelboards] The arc rating values for the panels are based on industry testing by two separate major utilities and one research institute and that the arc will not sustain more than 2 cycles. This week’s question: Have you used 4 cal/cm^2 from NESC Table 410-1 for panels up to 250V? Yes No Never heard of it |
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| Author: | stevenal [ Mon Oct 12, 2020 7:38 am ] |
| Post subject: | Re: Maximum 4 cal/cm^2 for panels to 250 Volts? NESC 410-1 |
Note the scope of the NESC prior to use. It may not be appropriate for many forum members. |
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| Author: | Jim Phillips (brainfiller) [ Mon Oct 12, 2020 7:59 am ] |
| Post subject: | Re: Maximum 4 cal/cm^2 for panels to 250 Volts? NESC 410-1 |
To add to the discussion: OSHA letter of interpretation |
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