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R623       *Use only appropriate connectors. Branch circuits may include intermediate elements such as COTS connectors, splices, COTS flexible/rolling/sliding contacts, and COTS slip rings, as long as the entire electrical pathway is via appropriately gauged/rated elements.

Slip rings containing mercury are prohibited per R203.

Similar Rules

Rule R621
R621       *Protect circuits with appropriate circuit breakers. Each branch circuit must be protected by 1 and only 1 circuit breaker or fuse on the PD per Table 8‑3. No other electrical load can be connected to the breaker or fuse supplying this circuit with the exception of devices downstream of a permitted motor power adapter board placed between the PD and a motor controller (WCP-1380, RF-4003, RF-4004, RF-4005).
Rule R618
R618       *Use PD terminals as designed. Only 1 wire shall be connected to each terminal on the PD.
Rule R619
R619       *Only use specified circuit breakers in a PD. The only circuit breakers permitted for use in the PD are:
Rule R620
R620       *Only use specified fuses in PD. The only fuses permitted for use in the PD are automotive blade fuses with the following values: