Electrical "Legality" Questions
Should I buy Type W feeder cable or Entertainment Grade? Are they both equally "Legal"?
Listed "Type W" and "Type SC" (Entertainment Grade) feeder cables are both specifically mentioned in the NEC as "legal" for entertainment applications. TMB supplies both types: The "Type W" feeder cables are more durable, but also heavier and more expensive. The "Type SC" feeder cables are less durable but also less expensive and lighter in weight. The "Type W" is also approved for a wider range of applications than the "type SC". TMB would recommend "Type W" for general use and "Type SC" for certain applications such as on studio lots.
Are single-pole cam type connectors legal or do I have to use an interlocked system?
Regular single-pole cam type connectors are only legal when used by "qualified persons". If your feeder connections are not being made and unmade by qualified, trained professionals, you must use some kind of Interlocked system.