WebTransformer Secondary Amperes Maximum Primary Fuse % Rating Primary Fuse Secondary Fuse 9 or more 250 125* less than 9 250 167 * If 125% does not correspond to a standard ampere rating, the next higher standard rating shall be permitted. Secondary Fuses Selecting fuses for the secondary is simple once rated secondary current is known. Webfusing and Table 3 for sizing of secondary fusing. For more specific sizing recommendations, refer to Tables 4 and 5 for Class J fuse protection and Tables 6 and 7 for Class CC fuse protection. Table 4 shows recommended Class J fuse ratings for standard transformers below 600 Volts without secondary protection, while Table 5 shows the …
I RCNY §15-02 - New York City
WebSep 17, 2024 · The secondary fuses or breakers should open in less time than the primary fuses on any possible current so as to prevent the blowing of primary fuses on a secondary fault. A transformer fault is … WebFuse Diagnostic Sizing Charts Motor Loads (NEC® 430) Solenoids (Coils) Above 600V 600V & Less Fuse Recommendations Volts Fuse(s) 0-250 LPN-RK_SP, FRN-R 0-600 … fly the jumper
Secondary Protectors UpCodes
WebJan 28, 2014 · USA. Dec 26, 2013. #1. Table 450.3 (B) states that I can raise the fuse on a transformer that has less than 9A primary current from 167% to 250% if the secondary is fused at 125% of the secondary current. If the transformer has is center tapped (120V/240V) and there are loads across the 120V and across the 240V, how is the … WebThe secondary side of the transformer is often labeled LOAD. The load has a VA (volt-ampere) rating. The VA rating is used to select the properly sized fuse for that circuit. The fuse must be smaller than the VA rating of the transformer. The fact that "fuse" is mentioned right after "secondary side" is a red herring. WebSep 16, 2015 · a. Circuit breaker size up to 300% of or fuse rating up to 250% of transformer-rated current, for transformers with secondary voltage greater than 1,000V. b. Circuit breaker size or fuse rating up … greenplum tablespace