Spike Leg on three phase power

[dresco]

What is the "spike leg" on three phase power. My journeyman said Wye has a spike leg on voltage and Delta has a spike leg on current. I have not been able to find this with a meter.
I understand that wye is 120/208 etc. or 1.7 times the single leg when any two phases are measured; and delta is double, 110/220.
Is there any truth to the "spike leg" theory?

 

[busbar]

‘Spike leg’? New one on me. Might that be 240V delta or open delta service? It’s often grounded at the center tap of one of three [or two] 1ø transformers, providing 240V ø-ø, but typically 120V ø-n on A and Cø, and 208V Bø-N.

In that arrangement, Bø is also called stinger/red/orange/purple/power/wild/bastard/high leg. {There is no particular “spike current” on a wye or delta system unless loads are badly balanced.}

http://home.att.net/~benmiller/elecsys.htm

has some illustrations of typical US voltage configurations that may help.

 

[jbartos]

Suggestion: It is known that wye connection has the voltage configuration that could be viewed as "spiky", namely, Van=Vbn=Vcn=Vab/sqrt3=Vbc/sqrt3=Vca/sqrt3
and delta connection has the current configuration that could be viewed as spiky, namely,
Ia=Ib=Ic=sqrt3 x Iab=sqrt3 x Ibc=sqrt3 x Ica