protection may be omitted for monitoring circuits of automatic voltage regulators— secondary side of current transformers shall not be protected— the secondary side of the single phase supply transformers for control circuits shall be protected unless primary side protection is proved sufficient. (See Sec.4 D103 b)). The protection may be in one pole (phase) only. See also H101 b).— separate protection may be omitted for control circuits branched off from a feeder circuit with nominal rating limited to 16 A— separate protection may be omitted for control circuits branched off from a feeder circuit with nominal rating limited to 25 A and when the control circuit consists of adequately sized internal wiring only.— for voltage transformers in high voltage switchgear, see 401d)
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