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Aux Wire in MV Compartment

Aux Wire in MV Compartment

Aux Wire in MV Compartment

(OP)
I've seen references that indicate that control wire routed through MV compartments should either be in metal conduit or have a metal braided shield. However, I rarely see this done in practice. I see it in CT wiring in MV switchgear but not, for example, thermocouple wire in dry type transformer compartments. Is there an actual requirement for this that is being violated or is it acceptable to run LV control wire through an MV compartment (in particular a dry type transformer compartment with live MV terminals)?

RE: Aux Wire in MV Compartment

It is okay, to run wiring without a raceway is the possibility of mechanical damage is remote, Whether metal-clad or metal enclosed.

Most thermocouple wiring for dry type transformer have some form of additional covering to the temperature control unit. Fan wiring are more varied using cab tire cable to single conductor routed is such a way from physical damage and with panduit wireways versus conduit.

Even CT wiring can simply be switchboard wiring, single conductor, bundled/harness without the use of additional mechanical protection.

RE: Aux Wire in MV Compartment

(OP)
Thanks, collies99. Actually, I wasn't thinking of physical protection so much as protection from inadvertent contact with MV voltage. LV wire in a MV compartment with exposed surfaces has the potential for contact and a metal sheath or conduit would help protect people and equipment external to the gear. The metal braided wire I've seen on CT circuits is not MC but just a braided tinned copper outer jacket similar to some automotive cable applications.

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