The grounding elctrode conductor for 400 amp service wire size from 350mcm to 600 mcm 1 0 cu article 250 66 equipment grounding conductor for a 400 amp circuit 3 cu article 250 122. Although wire gauge sizes smaller than 10 gauge may be acceptable for the amount of current draw we recommend using 10 gauge as the smallest wire size for any amplifier of 100.
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Nema does not specify a ground wire size but the national electrical code certainly does.
400 amp ground wire size chart. An amplifier s expected output power determines what size wire to use. The calculator allows entry of a voltage drop but caution should be used when doing so to make sure you are calculating the wire sizes in accordance with nec article 210 19 fpn no. Your two 12 subwoofers are wired together to present a total impedance of 4 ohms with a total power rating of 600 watts rms.
National electrical code nec 2014 edition table 250 122. Rating or setting of automatic overcurrent device ocpd in circuit ahead of equipment i e circuit breaker. Nfpa 70 national electrical code table 250 95 rating or setting of automatic overcurrent device in circuit ahead of equipment conduit etc.
The ratings of your subwoofers have no bearing at all on what size power and ground wire for your amplifier to use. Ground cables should be the same size or larger as the power cable. Table 250 122 see installation restrictions in section 250 120.
4 the nec allows a maximum of a 3 voltage drop on the main branch of a circuit at the farthest outlet of power and 5 total to both feeders and branch. This is based on nec nfpa 70. Current draw figures are based on rms power of the amplifier with a 50 efficiency rating.
Ground wire size table source. The ground conductor size calculator will calculate the proper ground conductor size for grounding raceways and equipment based on ampere rating or setting of automatic overcurrent protection device in circuit ahead of equipment. According to the nec 2005 edition table 250 122 minimum size equipment grounding conductors for grounding raceway and equipment 3awg copper is the correct size for a 400 amp service or 1 awg aluminum.
Size of equipment grounding conductors egc for grounding raceway equipment. 4 gauge will work fine for that amp.
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