IMPERIAL STANDARS

MECHANICAL TOLERANCES (CONFORMS TO EIA STANDARD RS-217):

  • A & B- Exterior dimensions. Held to maximum tolerance only to ensure overall enclosure fit.
  • D & E- Dimensions held to + tolerance, to ensure magnetic qualities under all applications.
  • F & G- Window dimensions. Held to a minimum tolerance, only to ensure coil fit.
  • K & R- Reference dimensions only.

MEASURMENT:

  • D- Dimension measured by caliper at any point on the either core half.
  • E- Dimension measured at the butt joint.
  • F & G- Dimensions measured at the shortest point, at least twice the radius R from the edge of the window.
Dimension Steel thickness Allowable tolerances-finished cores
A 4 mil +3/32 max when A ≤ 5
+3/16 max when A > 5 ≤ 10
+5/16 max when A > 10
12 mil +1/8 max when A ≤ 5
+1/4 max when A > 5 ≤ 10
+3/8 max when A > 10
B 4 mil +3/32 max when B ≤ 5
+5/32 max when B > 5 ≤ 10
+1/4 max when B > 10
12 mil +1/8 max when B ≤ 5
+3/16 max when B > 5 ≤ 10
+5/16 max when B > 10
D 4 and 12 mil +1/32 – 0 when D <1
+3/64 – 0 when D >= 1 < 2
+1/16 – 0 when D >= 2
+5/32 – 0 when 2E > 2-1/2
2E 4 and 12 mil ±1/32 when 2E ≤ 1
+1/16 – 1/32 when 2E > 1 ≤ 2
±1/16 when 2E > 2
F 4 and 12 mil -1/64 min
G 4 and 12 mil -1/64 min
K All G/2 if G ≤ 5
G/3 to nearest 1/16 if G > 5
R All 1/16 when F ≤ 2 & G ≤ 2
1/8 when F or G >2 and F&G ≤5
5/32 when F or G > 5
Tilt 4 and 12 mil 1/32 max when B < 3-1/2
1/16 max when B >=3-1/2

Electrical Guarntees

Quality grade Steel thickness, mil Test conditions Bm, kG,f, Hz Specificcore losses,,W/lb Specific apparent power of metal, VA/lb VA ofgap per phase
Standard 12 15 60 1.1 1.75 5.0 x A
Standard 4 15 400 12.0 13.1 29.9 x A

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