NEMA L5-30R explained: 125V 30A twist-lock ratings, how to wire it, 10 AWG branch circuit sizing, GFCI rules, and how L5-30 differs from TT-30 and L14-30.
Liquid tight vs sealtite explained: Sealtite is a brand, LFMC and LFNC are the two NEC wiring methods. Article 350 vs 356, fill, length limits and grounding.
60 amp sub panel wire size, EGC sizing, and whether a sub panel size of 60 amp is enough for your load. NEC Table 310.16, 215.3, 250.122 and 408.40 explained.
Schedule 40 vs Schedule 80 PVC conduit: same outside diameter, different wall. Fill loss, physical damage rules under NEC 352.12(C) and 300.5(D)(4), and where each is allowed.
Armored cable (Type AC) vs MC cable: the bonding strip, the ground path, wet location limits, ampacity from NEC Table 310.16, and how to tell them apart in the field.
High resistance grounding limits ground-fault current to 5-10 amps so a first fault alarms instead of tripping. How the NGR is sized, and what NEC 250.36 requires.
Minimum circuit ampacity sizes your conductors, not your breaker. The NEC 440.32 and 440.33 formulas, MCA vs MOCP, and how to pick a wire from a nameplate MCA.
How many outlets on a 20 amp circuit? None in a dwelling — the NEC sets no limit. In commercial work, 13, from the 180 VA per yoke rule in NEC 220.14(I).
How high should outlets be off the floor? The NEC sets no minimum; 12–18 in is standard. See the 4 height limits the NEC does enforce, plus heights by room.
A dedicated circuit for a refrigerator is permitted by NEC 210.52(B)(1) Ex. 2, not required — but the appliance manual and 110.3(B) usually make it mandatory.
Convert watts to BTU/hr by multiplying by 3.412142. Formula, conversion chart, tons of cooling, and how to work out which watts actually become heat.
14-2-2 cable holds two hots, two separate neutrals and a ground — two independent 15 A circuits in one jacket. Colours, derating, box fill and when to use it.
