The ambient insulation rating of wires and cables is imprinted on the wire and cables. The labels on the cables will tell you the wire size, number of conductors and temperature rating of the wires and cables. The higher the cable and wire temperature ratings the higher the amount of current that is allowed to be drawn by the wire and cable according to the electrical code book.
The typical rating of a hot wire relay contacts is 35 amp
600amps
NEC 310.16 conductor ampacities NEC 240.4(D) For residential installations the smallest wire to be used is 14 AWG (15 amps rating) and for commercial installations the smallest wire to be used is 12 AWG (20 amp rating)
Wire sizing of a feed conductor is based on the amperage that a device draws. To calculate amperage from KVA a voltage of the supply has to be stated. Without this voltage and whether the transformer is single or three phase an answer can not be given.
Sorry, there is no such wire size as "30 gauge" in the AWG (American Wire Gauge) system. For the ampacity rating of all standard conductor sizes, go to Table 310-16 of the National Electric Code. If you mean what wire size will carry 30 amps then a #10 copper wire insulation rating of 90 degree C is rated at 30 amps.
Wire Sizing Amps
A safety switch does not provide overload or over current protection. The safety switch is positioned just before the motor and just after the motor protection equipment. To wire a safety switch, the line in from the motor protection goes to the top of the switch and the motor load connects to the bottom of the safety switch. The switch must have at minimum of a 240 volt rating and have an amperage rating of not less than 30 amps. Wire sizing for the connection will be #10 conductor which has a rating of 30 amps.
The different sizes allow for different current capacities to be carried by the wire. The larger the size, the more amperage capacity is allowed. The question refers to the metric sizing of wire. North American wire sizing is still done in AWG.
The typical rating of a hot wire relay contacts is 35 amp
The typical rating of a hot wire relay contacts is 35 amp
To answer these types of questions, a voltage of the single phase motor should be stated. It has to do with the breaker sizing and wire sizing and current load.
The amp rating of NM (Non-Metallic) wire varies depending on the gauge of the wire. For example, a 14-gauge NM wire typically has an amp rating of 15 amps, while a 12-gauge NM wire has an amp rating of 20 amps. It is important to consult local building codes and regulations to determine the appropriate wire gauge and amp rating for specific applications.
Here is a fine Wire Size Calculator. Scroll down to related links and look at "Wire Size Calculator".
Wire size is rated by Amperes of current. You did not mention the wire size of the aluminum wire, so there is no way to answer your question. The voltage rating is more a rating of how good the insulation around the wire is.
Circuit breakers are used to protect the conductor that is connected to it. The sizing of the conductor is based on the current of the load. As the connected load current is increased so must the wire size to accommodate that higher current. Therefore as the wire size increases so must the breaker size to accommodate the higher load current.
The larger in diameter the wire is, the larger the current carrying capacity the wire has.
When ever a wire is changed, change it by the same type, rating or capacity of wire.